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Anisotropic and Controllable Gilbert-Bloch Dissipation in Spin Valves
Norwegian Univ Sci & Technol, Ctr Quantum Spintron, Dept Phys, Trondheim, Norway..
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.ORCID iD: 0000-0001-5028-8928
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.ORCID iD: 0000-0003-2339-1692
Norwegian Univ Sci & Technol, Ctr Quantum Spintron, Dept Phys, Trondheim, Norway..
2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 14, article id 147201Article in journal (Refereed) Published
Abstract [en]

Spin valves form a key building block in a wide range of spintronic concepts and devices from magnetoresistive read heads to spin-transfer-torque oscillators. We elucidate the dependence of the magnetic damping in the free layer on the angle its equilibrium magnetization makes with that in the fixed layer. The spin pumping-mediated damping is anisotropic and tensorial, with Gilbert- and Bloch-like terms. Our investigation reveals a mechanism for tuning the free layer damping in situ from negligible to a large value via the orientation of fixed layer magnetization, especially when the magnets are electrically insulating. Furthermore, we expect the Bloch contribution that emerges from the longitudinal spin accumulation in the nonmagnetic spacer to play an important role in a wide range of other phenomena in spin valves.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 122, no 14, article id 147201
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-251203DOI: 10.1103/PhysRevLett.122.147201ISI: 000463902800015Scopus ID: 2-s2.0-85064401197OAI: oai:DiVA.org:kth-251203DiVA, id: diva2:1338765
Note

QC 20190724

Available from: 2019-07-24 Created: 2019-07-24 Last updated: 2019-07-24Bibliographically approved

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Polishchuk, DmytrKorenivski, Vladislav

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