Molecular control of Spin Hall and Unidirectional Magnetoresistance in YIG/PtMn

Molecular control of Spin Hall and Unidirectional Magnetoresistance in YIG/PtMn | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Molecular control of Spin Hall and Unidirectional Magnetoresistance in YIG/PtMn Hari Babu Vasili, Akash Bajaj, Satam Alotibi, Mairi McCauley, and 11 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6064663/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Molecular engineering at metal interfaces has opened new avenues to design functional structures by manipulating charge transfer and hybridization effects. 1 – 9 While earlier studies have mainly focused on controlling the ferromagnetic order, 10 – 17 the tuning of antiferromagnetic (AF) properties remains largely unexplored. Here, we investigate an enhanced spin Hall effect in Y 3 Fe 5 O 12 (YIG)/PtMn with a C 60 overlayer. Our findings demonstrate a charge transfer from the antiferromagnetic PtMn to C 60 , leading to a canted Mn 2+ -AF ordering at the PtMn/C 60 interface. This charge transfer lowers the Fermi energy level of PtMn, a feature that is responsible for the enhanced spin Hall conductivity in YIG/PtMn/C 60 . The interplay between the Mn 2+ -AF order at the molecular interface and the Néel vector of PtMn results in changes to the exchange bias, magnetic blocking of the YIG spins underneath, and the emergence of a highly sought-after unidirectional magnetoresistance (UMR). This UMR exhibits a sign change with the magnetic field polarity, providing insights into non-reciprocal magnetoresistance phenomena in high spin-orbit coupling systems. These results pave the way for developing tunable AF spintronic applications in rectification, low-power electronics, and beyond. Physical sciences/Physics/Condensed-matter physics/Surfaces, interfaces and thin films Physical sciences/Physics/Condensed-matter physics/Spintronics Physical sciences/Physics/Condensed-matter physics/Molecular electronics Full Text Additional Declarations There is NO Competing Interest. Supplementary Files Supplementaryinformationfirstsubmssion.docx Supplementary information Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6064663","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":426529832,"identity":"2d563775-a0f2-45fd-bef8-0ec93e709f10","order_by":0,"name":"Hari Babu 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Leeds","correspondingAuthor":false,"prefix":"","firstName":"Oscar","middleName":"","lastName":"Cespedes","suffix":""}],"badges":[],"createdAt":"2025-02-19 13:45:07","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-6064663/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6064663/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":99790139,"identity":"1e477dc2-5395-429b-b026-3d8f2bc1daad","added_by":"auto","created_at":"2026-01-08 12:56:36","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1120760,"visible":true,"origin":"","legend":"","description":"","filename":"ManuscriptPtMnfirstsubmission.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6064663/v1_covered_0bd0b289-447a-44e7-83b3-95459f2edf13.pdf"},{"id":78316956,"identity":"f44662dd-98ad-45ad-98e0-c4e42f6e5d06","added_by":"auto","created_at":"2025-03-12 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YIG/PtMn","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"","lastPublishedDoi":"10.21203/rs.3.rs-6064663/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6064663/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eMolecular engineering at metal interfaces has opened new avenues to design functional structures by manipulating charge transfer and hybridization effects.\u003csup\u003e\u003cspan additionalcitationids=\"CR2 CR3 CR4 CR5 CR6 CR7 CR8\" citationid=\"CR1\" class=\"CitationRef\"\u003e1\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR9\" class=\"CitationRef\"\u003e9\u003c/span\u003e\u003c/sup\u003e While earlier studies have mainly focused on controlling the ferromagnetic order,\u003csup\u003e\u003cspan additionalcitationids=\"CR11 CR12 CR13 CR14 CR15 CR16\" citationid=\"CR10\" class=\"CitationRef\"\u003e10\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR17\" class=\"CitationRef\"\u003e17\u003c/span\u003e\u003c/sup\u003e the tuning of antiferromagnetic (AF) properties remains largely unexplored. Here, we investigate an enhanced spin Hall effect in Y\u003csub\u003e3\u003c/sub\u003eFe\u003csub\u003e5\u003c/sub\u003eO\u003csub\u003e12\u003c/sub\u003e(YIG)/PtMn with a C\u003csub\u003e60\u003c/sub\u003e overlayer. Our findings demonstrate a charge transfer from the antiferromagnetic PtMn to C\u003csub\u003e60\u003c/sub\u003e, leading to a canted Mn\u003csup\u003e2+\u003c/sup\u003e-AF ordering at the PtMn/C\u003csub\u003e60\u003c/sub\u003e interface. This charge transfer lowers the Fermi energy level of PtMn, a feature that is responsible for the enhanced spin Hall conductivity in YIG/PtMn/C\u003csub\u003e60\u003c/sub\u003e. The interplay between the Mn\u003csup\u003e2+\u003c/sup\u003e-AF order at the molecular interface and the N\u0026eacute;el vector of PtMn results in changes to the exchange bias, magnetic blocking of the YIG spins underneath, and the emergence of a highly sought-after unidirectional magnetoresistance (UMR). This UMR exhibits a sign change with the magnetic field polarity, providing insights into non-reciprocal magnetoresistance phenomena in high spin-orbit coupling systems. These results pave the way for developing tunable AF spintronic applications in rectification, low-power electronics, and beyond.\u003c/p\u003e","manuscriptTitle":"Molecular control of Spin Hall and Unidirectional Magnetoresistance in YIG/PtMn","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-03-12 03:59:12","doi":"10.21203/rs.3.rs-6064663/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"742bb02f-30d8-434e-a5f7-4a99ecd058b1","owner":[],"postedDate":"March 12th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[{"id":45445248,"name":"Physical sciences/Physics/Condensed-matter physics/Surfaces, interfaces and thin films"},{"id":45445249,"name":"Physical sciences/Physics/Condensed-matter physics/Spintronics"},{"id":45445250,"name":"Physical sciences/Physics/Condensed-matter physics/Molecular electronics"}],"tags":[],"updatedAt":"2026-01-04T07:20:33+00:00","versionOfRecord":[],"versionCreatedAt":"2025-03-12 03:59:12","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-6064663","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-6064663","identity":"rs-6064663","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}