<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:5c49f7b6-7bc9-40b1-aee7-2ae2e250788b,g:6fc2616d-2326-43c5-9bde-c6943e4e5c00-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:magn="http://www.magn.com/20250329" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" xmlns:dtr-types1="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.magn.com/20250329">
  <xs:import namespace="http://fasb.org/srt/2024" schemaLocation="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2024" schemaLocation="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2024" schemaLocation="https://xbrl.sec.gov/dei/2024/dei-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2024" schemaLocation="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="magn-20250329_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="magn-20250329_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="magn-20250329_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="magn-20250329_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.magn.com/role/Cover">
        <link:definition>0000001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedandCombinedStatementsofOperations" roleURI="http://www.magn.com/role/ConsolidatedandCombinedStatementsofOperations">
        <link:definition>9952151 - Statement - Consolidated and Combined Statements of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedandCombinedStatementsofComprehensiveIncomeLoss" roleURI="http://www.magn.com/role/ConsolidatedandCombinedStatementsofComprehensiveIncomeLoss">
        <link:definition>9952152 - Statement - Consolidated and Combined Statements of Comprehensive Income (Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedandCombinedBalanceSheets" roleURI="http://www.magn.com/role/ConsolidatedandCombinedBalanceSheets">
        <link:definition>9952153 - Statement - Consolidated and Combined Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedandCombinedStatementsofCashFlows" roleURI="http://www.magn.com/role/ConsolidatedandCombinedStatementsofCashFlows">
        <link:definition>9952154 - Statement - Consolidated and Combined Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedandCombinedStatementsofChangesinStockholdersEquity" roleURI="http://www.magn.com/role/ConsolidatedandCombinedStatementsofChangesinStockholdersEquity">
        <link:definition>9952155 - Statement - Consolidated and Combined Statements of Changes in Stockholders&#8217; Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentation" roleURI="http://www.magn.com/role/BasisofPresentation">
        <link:definition>9952156 - Disclosure - Basis of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueandAccountsReceivable" roleURI="http://www.magn.com/role/RevenueandAccountsReceivable">
        <link:definition>9952157 - Disclosure - Revenue and Accounts Receivable</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Acquisition" roleURI="http://www.magn.com/role/Acquisition">
        <link:definition>9952158 - Disclosure - Acquisition</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TransactionandOtherActivities" roleURI="http://www.magn.com/role/TransactionandOtherActivities">
        <link:definition>9952159 - Disclosure - Transaction and Other Activities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.magn.com/role/Leases">
        <link:definition>9952160 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebt" roleURI="http://www.magn.com/role/LongTermDebt">
        <link:definition>9952161 - Disclosure - Long-Term Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurements" roleURI="http://www.magn.com/role/FinancialInstrumentsandFairValueMeasurements">
        <link:definition>9952162 - Disclosure - Financial Instruments and Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.magn.com/role/IncomeTaxes">
        <link:definition>9952163 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandGeographicData" roleURI="http://www.magn.com/role/SegmentandGeographicData">
        <link:definition>9952164 - Disclosure - Segment and Geographic Data</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingenciesandCommitments" roleURI="http://www.magn.com/role/ContingenciesandCommitments">
        <link:definition>9952165 - Disclosure - Contingencies and Commitments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasicandDilutedNetIncomeLossPerShare" roleURI="http://www.magn.com/role/BasicandDilutedNetIncomeLossPerShare">
        <link:definition>9952166 - Disclosure - Basic and Diluted Net Income (Loss) Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateExpenseAllocation" roleURI="http://www.magn.com/role/CorporateExpenseAllocation">
        <link:definition>9952167 - Disclosure - Corporate Expense Allocation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationPolicies" roleURI="http://www.magn.com/role/BasisofPresentationPolicies">
        <link:definition>9955511 - Disclosure - Basis of Presentation (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionTables" roleURI="http://www.magn.com/role/AcquisitionTables">
        <link:definition>9955512 - Disclosure - Acquisition (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TransactionandOtherActivitiesTables" roleURI="http://www.magn.com/role/TransactionandOtherActivitiesTables">
        <link:definition>9955513 - Disclosure - Transaction and Other Activities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.magn.com/role/LeasesTables">
        <link:definition>9955514 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtTables" roleURI="http://www.magn.com/role/LongTermDebtTables">
        <link:definition>9955515 - Disclosure - Long-Term Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsTables" roleURI="http://www.magn.com/role/FinancialInstrumentsandFairValueMeasurementsTables">
        <link:definition>9955516 - Disclosure - Financial Instruments and Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandGeographicDataTables" roleURI="http://www.magn.com/role/SegmentandGeographicDataTables">
        <link:definition>9955517 - Disclosure - Segment and Geographic Data (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasicandDilutedNetIncomeLossPerShareTables" roleURI="http://www.magn.com/role/BasicandDilutedNetIncomeLossPerShareTables">
        <link:definition>9955518 - Disclosure - Basic and Diluted Net Income (Loss) Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationDetails" roleURI="http://www.magn.com/role/BasisofPresentationDetails">
        <link:definition>9955519 - Disclosure - Basis of Presentation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" roleURI="http://www.magn.com/role/AcquisitionScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails">
        <link:definition>9955520 - Disclosure - Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionNarrativeDetails" roleURI="http://www.magn.com/role/AcquisitionNarrativeDetails">
        <link:definition>9955521 - Disclosure - Acquisition - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TransactionandOtherActivitiesScheduleofRestructuringandRelatedCostsDetails" roleURI="http://www.magn.com/role/TransactionandOtherActivitiesScheduleofRestructuringandRelatedCostsDetails">
        <link:definition>9955522 - Disclosure - Transaction and Other Activities - Schedule of Restructuring and Related Costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TransactionandOtherActivitiesScheduleofRestructuringReservebyTypeofCostDetails" roleURI="http://www.magn.com/role/TransactionandOtherActivitiesScheduleofRestructuringReservebyTypeofCostDetails">
        <link:definition>9955523 - Disclosure - Transaction and Other Activities - Schedule of Restructuring Reserve by Type of Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesDetails" roleURI="http://www.magn.com/role/LeasesDetails">
        <link:definition>9955524 - Disclosure - Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtScheduleofLongtermDebtDetails" roleURI="http://www.magn.com/role/LongTermDebtScheduleofLongtermDebtDetails">
        <link:definition>9955525 - Disclosure - Long-Term Debt - Schedule of Long-term Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtScheduleofLongtermDebtDetails_1" roleURI="http://www.magn.com/role/LongTermDebtScheduleofLongtermDebtDetails_1">
        <link:definition>9955525 - Disclosure - Long-Term Debt - Schedule of Long-term Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtNarrativeDetails" roleURI="http://www.magn.com/role/LongTermDebtNarrativeDetails">
        <link:definition>9955526 - Disclosure - Long-Term Debt - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsNarrativeDetails" roleURI="http://www.magn.com/role/FinancialInstrumentsandFairValueMeasurementsNarrativeDetails">
        <link:definition>9955527 - Disclosure - Financial Instruments and Fair Value Measurements - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsScheduleofFairValueofDerivativesandLocationonConsolidatedBalanceSheetsDetails" roleURI="http://www.magn.com/role/FinancialInstrumentsandFairValueMeasurementsScheduleofFairValueofDerivativesandLocationonConsolidatedBalanceSheetsDetails">
        <link:definition>9955528 - Disclosure - Financial Instruments and Fair Value Measurements - Schedule of Fair Value of Derivatives and Location on Consolidated Balance Sheets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsScheduleofIncomeorLossfromDerivativeInstrumentsDetails" roleURI="http://www.magn.com/role/FinancialInstrumentsandFairValueMeasurementsScheduleofIncomeorLossfromDerivativeInstrumentsDetails">
        <link:definition>9955529 - Disclosure - Financial Instruments and Fair Value Measurements - Schedule of Income or (Loss) from Derivative Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsScheduleofAssetsMeasuredatFairValueonNonrecurringBasisDetails" roleURI="http://www.magn.com/role/FinancialInstrumentsandFairValueMeasurementsScheduleofAssetsMeasuredatFairValueonNonrecurringBasisDetails">
        <link:definition>9955530 - Disclosure - Financial Instruments and Fair Value Measurements - Schedule of Assets Measured at Fair Value on Non-recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandGeographicDataNarrativeDetails" roleURI="http://www.magn.com/role/SegmentandGeographicDataNarrativeDetails">
        <link:definition>9955531 - Disclosure - Segment and Geographic Data - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandGeographicDataScheduleofFinancialandOtherInformationbySegmentDetails" roleURI="http://www.magn.com/role/SegmentandGeographicDataScheduleofFinancialandOtherInformationbySegmentDetails">
        <link:definition>9955532 - Disclosure - Segment and Geographic Data - Schedule of Financial and Other Information by Segment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandGeographicDataScheduleofSelectedInformationbyGeographicalRegionDetails" roleURI="http://www.magn.com/role/SegmentandGeographicDataScheduleofSelectedInformationbyGeographicalRegionDetails">
        <link:definition>9955533 - Disclosure - Segment and Geographic Data - Schedule of Selected Information by Geographical Region (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandGeographicDataScheduleofSelectedInformationbyProductLineDetails" roleURI="http://www.magn.com/role/SegmentandGeographicDataScheduleofSelectedInformationbyProductLineDetails">
        <link:definition>9955534 - Disclosure - Segment and Geographic Data - Schedule of Selected Information by Product Line (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingenciesandCommitmentsDetails" roleURI="http://www.magn.com/role/ContingenciesandCommitmentsDetails">
        <link:definition>9955535 - Disclosure - Contingencies and Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasicandDilutedNetIncomeLossPerShareDetails" roleURI="http://www.magn.com/role/BasicandDilutedNetIncomeLossPerShareDetails">
        <link:definition>9955536 - Disclosure - Basic and Diluted Net Income (Loss) Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateExpenseAllocationDetails" roleURI="http://www.magn.com/role/CorporateExpenseAllocationDetails">
        <link:definition>9955537 - Disclosure - Corporate Expense Allocation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="magn_CorporateExpenseAllocation" abstract="false" name="CorporateExpenseAllocation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_NonCashInterestIncomeExpenseNet" abstract="false" name="NonCashInterestIncomeExpenseNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_IncreaseDecreaseInWorkingCapital" abstract="false" name="IncreaseDecreaseInWorkingCapital" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_ProceedsPaymentsFromToParentNet" abstract="false" name="ProceedsPaymentsFromToParentNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_PaymentsForTransfersToParent" abstract="false" name="PaymentsForTransfersToParent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_TransfersToParentNet" abstract="false" name="TransfersToParentNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_TransfersFromParent" abstract="false" name="TransfersFromParent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_DistributionOfParentsNetInvestment" abstract="false" name="DistributionOfParentsNetInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_AdjustmentsToAdditionalPaidInCapitalAcquisition" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalAcquisition" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_CorporateExpenseAllocationsAbstract" abstract="true" name="CorporateExpenseAllocationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="magn_CorporateExpenseAllocationTextBlock" abstract="false" name="CorporateExpenseAllocationTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="magn_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="magn_MagneraCorporationMember" abstract="true" name="MagneraCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="magn_TreasureHoldcoInc.Member" abstract="true" name="TreasureHoldcoInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_TreasureShareholdersMember" abstract="true" name="TreasureShareholdersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="magn_GlatfelterShareholdersMember" abstract="true" name="GlatfelterShareholdersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_BerryGlobalGroupInc.Member" abstract="true" name="BerryGlobalGroupInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_GLTAcquisitionMember" abstract="true" name="GLTAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapital" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapital" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_AmericasSegmentMember" abstract="true" name="AmericasSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_RestOfWorldSegmentMember" abstract="true" name="RestOfWorldSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_TransactionActivitiesMember" abstract="true" name="TransactionActivitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_NonCashChargesMember" abstract="true" name="NonCashChargesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_RestructuringNonCashItems" abstract="false" name="RestructuringNonCashItems" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_TransactionBonuses" abstract="false" name="TransactionBonuses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_RevolvingCreditFacilityDueNovember2029Member" abstract="true" name="RevolvingCreditFacilityDueNovember2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_TermLoanDueNovember2031Member" abstract="true" name="TermLoanDueNovember2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_A7.25FirstPrioritySeniorSecuredNotesMember" abstract="true" name="A7.25FirstPrioritySeniorSecuredNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_A4.75FirstPrioritySeniorSecuredNotesMember" abstract="true" name="A4.75FirstPrioritySeniorSecuredNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_CrossCurrencySwapMaturingNovember2027Member" abstract="true" name="CrossCurrencySwapMaturingNovember2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_CrossCurrencySwapMaturingNovember2029Member" abstract="true" name="CrossCurrencySwapMaturingNovember2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_UnitedStatesAndCanadaMember" abstract="true" name="UnitedStatesAndCanadaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_RestOfWorldMember" abstract="true" name="RestOfWorldMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_PersonalCareMember" abstract="true" name="PersonalCareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_ConsumerSolutionsMember" abstract="true" name="ConsumerSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_PreviousAcquisitionMember" abstract="true" name="PreviousAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="magn_EnvironmentRemediationAgreementTerm" abstract="false" name="EnvironmentRemediationAgreementTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="magn_AccrualForEnvironmentalLossContingenciesEscrowAsset" abstract="false" name="AccrualForEnvironmentalLossContingenciesEscrowAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="magn_BusinessCombinationContingentConsiderationLiabilityAccretionRate" abstract="false" name="BusinessCombinationContingentConsiderationLiabilityAccretionRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="magn_PercentOfSharesOutstandingAllocated" abstract="false" name="PercentOfSharesOutstandingAllocated" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="magn_CorporateExpenseAllocationsTable" abstract="true" name="CorporateExpenseAllocationsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="magn_CorporateExpenseAllocationsLineItems" abstract="true" name="CorporateExpenseAllocationsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
</xs:schema>
