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dc.contributor.authorTrainer, Christopher
dc.contributor.authorYim, Chi Ming
dc.contributor.authorHeil, Christoph
dc.contributor.authorFarrar, Liam
dc.contributor.authorTsurkan, Vladimir
dc.contributor.authorLoidl, Alois
dc.contributor.authorWahl, Peter
dc.date.accessioned2021-09-10T16:30:19Z
dc.date.available2021-09-10T16:30:19Z
dc.date.issued2021-10-15
dc.identifier.citationTrainer , C , Yim , C M , Heil , C , Farrar , L , Tsurkan , V , Loidl , A & Wahl , P 2021 , ' Probing magnetic exchange interactions with helium ' , Physical Review Letters , vol. 127 , no. 16 , 166803 . https://doi.org/10.1103/PhysRevLett.127.166803en
dc.identifier.issn0031-9007
dc.identifier.otherPURE: 275788592
dc.identifier.otherPURE UUID: 6ee3ae74-87e2-4631-b262-a56e993542ed
dc.identifier.otherORCID: /0000-0002-8635-1519/work/101581594
dc.identifier.urihttp://hdl.handle.net/10023/23948
dc.descriptionFunding: CT and PW acknowledge support from EPSRC (EP/R031924/1) and CMY and LSF from EP/S005005/1. C.H. acknowledges support by the Austrian Science Fund (FWF) Project No. P32144-N36 and the VSC-4 of the Vienna University of Technology. The work was partially supported by the Deutsche Forschungsgemeinschaft (DFG) through Transregional Research Collaboration TRR 80 (Augsburg, Munich, and Stuttgart).en
dc.description.abstractControlling and sensing spin-polarization of electrons forms the basis of spintronics. Here, we report a study of the effect of helium on the spin-polarization of the tunneling current and magnetic contrast in spin-polarized Scanning Tunneling Microscopy. We show that the magnetic contrast in SP-STM images recorded in the presence of helium depends sensitively on the tunneling conditions. From tunneling spectra and their variation across the atomic lattice we establish that the helium can be reversibly ejected from the tunneling junction by the tunneling electrons. The energy of the tunneling electrons required to eject the helium depends on the relative spin-polarization of the tip and sample, making the microscope sensitive to the magnetic exchange interactions. We show that the time-averaged spin polarization of the tunneling current is suppressed in the presence of helium and thereby demonstrate voltage control of the spin polarization of the tunneling current across the tip-sample junction.
dc.format.extent6
dc.language.isoeng
dc.relation.ispartofPhysical Review Lettersen
dc.rightsCopyright © 2021 American Physical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.127.166803en
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.subjectDASen
dc.subject.lccQCen
dc.subject.lccTKen
dc.titleProbing magnetic exchange interactions with heliumen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.Centre for Designer Quantum Materialsen
dc.contributor.institutionUniversity of St Andrews.Condensed Matter Physicsen
dc.identifier.doihttps://doi.org/10.1103/PhysRevLett.127.166803
dc.description.statusPeer revieweden
dc.identifier.urlhttps://journals.aps.org/prl/accepted/5c07cY84Lad1f76d27e830e04d9cee12fabc238fden


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