LLG方程为很多现象的分析提供了十分可靠的依据,包括很多理论计算的工作都是在此基础上进行,比如探讨自旋流对磁矩的作用就可以在这个方程的右边多加上一个自旋转移力矩(Spin Transfer Torque)项和自旋轨道力矩(Spin-Orbit Torque)项[1]。 2、铁磁共振-Ferromagnetic resonance(FMR) 铁磁体磁化后的磁矩在成角度的外场作...
这篇paper最重要的意义就是提出了ST-FMR(spin-torque Ferromagnetic Resonance, 自旋磁矩铁磁共振)法来测量体系中的自旋流(spin current)和自旋霍尔角(spin Hall angle),相当于对以前的测量方法论框架中补充了很大一块空缺。这也是目前主流的输运测量方法之一。 参考文献 https://journals.aps.org/prl/abstract/10.11...
Spin-torque ferromagnetic resonance (ST-FMR) has been widely used for measuring damping-like spin-orbit torques in magnetic bilayers. Typically, the ratio between the damping-like and field-like spin-orbit torques are extrapolated based on the ferromagnetic resonance line shapes. However, when the ...
For the sake of investigating how the spin current interacts with the magnetic moments in antiferromagnets, we perform spin-torque ferromagnetic resonance measurements on Co20Fe60B20 4nm/Ir25Mn75 tIrMn nm/Pt 4 nm multilayers under a spin Hall effect of Pt. The effective magnetic damping in Co...
ferromagnetic layer or a material with a high spin Hall angle. Here we demonstrate highly coherent field and current tunable microwave signals from nano-constrictions in single 15–20 nm thick permalloy layers with oxide interfaces. Using a combination of spin torque ferromagnetic resonance ...
the asymmetry of the resonance lineshape are affected by embedding the free ferromagnetic layer into the FNF tri- layer. Our calculation proceeds in three parts. In Sec. II we derive general expressions for the spin transfer torque, which we then apply to the calculation of the magneti- za...
例如北航的赵巍胜课题组在2020年发表在APL上的——具有垂直各向异性的氦离子辐照W-CoFeB-MgO Hall bars中的自旋轨道矩(SOT)驱动的多层转换一文中,运用了氦离子辐照技术对W(4 nm)/CoFeB (0.6 nm)/MgO (2 nm)/Ta (3 nm)多层膜进行了结构的调控,通过对调控前后以及过程中磁学和电学性质变化的研究,表明这种...
Spin-Torque Ferromagnetic Resonance Induced by the Spin Hall Effect We demonstrate that the spin Hall effect in a thin film with strong spin-orbit scattering can excite magnetic precession in an adjacent ferromagnetic film... L Liu,T Moriyama,DC Ralph,... - 《Physical Review Letters》 被引量...
Using Mn3Pt as a representative example, we confirm the anisotropic σzxp by the measurements of the current-induced spin-torque ferromagnetic resonance (ST-FMR) and the anomalous Hall effect (AHE) loop shift of the ferromagnetic layers adjacent to the Mn3Pt layer in a SOT device. We also ...
Surprisingly, the variation of the resonance frequency is remarkable (> 1.6 GHz) with the spin transfer torque even though the domain wall is pinned. Since the presented domain wall ferromagnetic resonance study has been performed for the pinned domain wall, the contributions of extrinsic defects ...