论文标题
重金属/铁磁/氧化物异质结构中强两麦克农的起源
Origin of Strong Two-Magnon Scattering in Heavy Metal/Ferromagnet/Oxide Heterostructures
论文作者
论文摘要
我们通过改变位于FM层上方和下方的材料，实验研究了重金属（HM）/Ferromagnet（FM）/氧化物异质结构（FM = CO，NI81FE19或FE60CO20B20）中两麦克农散射（TMS）的起源。我们表明，HM/FM/氧化物系统中的强TMS主要在HM/FM界面出现，并且随着该界面处的界面自旋轨道耦合和磁性粗糙度的强度而增加。 FM/氧化物界面处的TMS相对较弱，即使在此界面处的自旋轨道耦合的系统中也会产生强大的界面磁各向异性。我们还建议，在HM/FM界面上自旋 - 电流引起的非均匀短波长磁杆的激发可能是在均匀模式下施加的自旋轨道扭矩的自旋记忆损失的机理。
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.
