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Origin of Strong Two-Magnon Scattering in Heavy Metal/Ferromagnet/Oxide Heterostructures

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arxiv 2001.00300 v1 pith:FT22JE2M submitted 2020-01-02 cond-mat.mtrl-sci cond-mat.mes-hall

Lijun Zhu , Lujun Zhu , D. C. Ralph , R. A. Buhrman This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.mes-hall
keywords interfaceoxidespin-orbitstrongcouplingferromagnetheterostructuresinterfacial
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We experimentally investigate the origin of the two-magnon scattering (TMS) in heavy-metal (HM)/ferromagnet (FM)/oxide heterostructures (FM = Co, Ni81Fe19, or Fe60Co20B20) by varying the materials located above and below the FM layers. We show that strong TMS in HM/FM/oxide systems arises primarily at the HM/FM interface and increases with the strength of interfacial spin-orbit coupling and magnetic roughness at this interface. TMS at the FM/oxide interface is relatively weak, even in systems where spin-orbit coupling at this interface generates strong interfacial magnetic anisotropy. We also suggest that the spin-current-induced excitation of non-uniform short-wavelength magnon at the HM/FM interface may function as a mechanism of spin memory loss for the spin-orbit torque exerted on the uniform mode.

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