Journal
PHYSICAL REVIEW APPLIED
Volume 13, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.13.034038
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Funding
- Office of Naval Research [N00014-15-1-2449]
- NSF MRSEC program through the Cornell Center for Materials Research [DMR-1719875]
- NSF [ECCS-1542081]
- National Natural Science Foundation of China [51901121]
- Science and Technology Program of Shaanxi Province [2019JQ433]
- Fundamental Research Funds for the Central Universities [GK201903024]
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We experimentally investigate the origin of 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 layer. We show that strong TMS in HM/FM/oxide systems arises primarily at the HM/FM interface and increases with the strength of the 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 nonuniform short-wavelength magnons 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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