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

被引：29
作者：
Zhu, Lijun [1 ]
Zhu, Lujun [2 ]
Ralph, D. C. [1 ,3 ]
Buhrman, R. A. [1 ]
机构：
[1] Cornell Univ, Ithaca, NY 14850 USA
[2] Shaanxi Normal Univ, Coll Phys & Informat Technol, Xian 710062, Peoples R China
[3] Kavli Inst Cornell, Ithaca, NY 14853 USA
来源：
PHYSICAL REVIEW APPLIED | 2020年 / 13卷 / 03期
基金：
中国国家自然科学基金;
关键词：
EXTRINSIC CONTRIBUTIONS; SPIN; ANISOTROPY;
D O I：
10.1103/PhysRevApplied.13.034038
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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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页数：10
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