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Spin relaxation in multilayers with synthetic ferrimagnets
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics. NAS Ukraine, Inst Magnetism, UA-03680 Kiev, Ukraine..
Norwegian Univ Sci & Technol, Ctr Quantum Spintron, Dept Phys, NO-7491 Trondheim, Norway..
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics. NAS Ukraine, Inst Magnetism, UA-03680 Kiev, Ukraine..
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, no 14, article id 144401Article in journal (Refereed) Published
Abstract [en]

We demonstrate the strong tunability of the spin-pumping contribution to magnetic damping in a thin-film ferromagnetic free layer interfacing with a synthetic ferrimagnet (SFM), acting as a spin sink, via a thin Cu spacer. The effect strongly depends on the magnetic state of the SFM, a trilayer structure composed of two Fe layers coupled via indirect exchange mediated by a Cr spacer. With increasing Cr thickness, the SFM state undergoes a transition from an antiparallel configuration via a noncollinear configuration to a parallel configuration. We can explain the corresponding nonmonotonous dependence of spin relaxation in the free layer in terms of modulation of the longitudinal spin transport as well as relaxation of the transverse angular momentum in the SFM. The results should be useful for designing high-speed spintronic devices where tunability of spin relaxation is advantageous.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 98, no 14, article id 144401
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-237103DOI: 10.1103/PhysRevB.98.144401ISI: 000446296400002Scopus ID: 2-s2.0-85054563141OAI: oai:DiVA.org:kth-237103DiVA, id: diva2:1259528
Funder
Swedish Research Council, 2014-4548Stiftelsen Olle Engkvist Byggmästare
Note

QC 20181030

Available from: 2018-10-30 Created: 2018-10-30 Last updated: 2018-10-30Bibliographically approved

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Korenivski, Vladislav

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Polishchuk, Dmytro M.Kravets, AnatoliiKorenivski, Vladislav
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