spin torquevortex gyrationThis chapter reviews a domain wall (DW) displacement and a vortex core gyration induced by the contributions of the spin-transfer torque (STT) and the Oersted field. It distinguishes the polarity and chirality of the vortex core in a Ni81Fe19 disk using a current-...
畴壁内部不同位置的磁化强度具有不同的方向,相邻磁化强度之间存在一定的夹角,当存在自旋极化电流时,被极化的电子 具有特定指向的自旋,当它们运动至畴壁处,由于电子的自旋与背景磁化强度之间并不平行,它们会发生角动量的转移,即产生自旋转移矩,这个矩一方面使得畴壁内部背景磁矩的方向发生偏转(偏向极化电子的自旋),另一...
上式中第一项为磁矩在有效场作用下的进动,第二项为磁化强度向其平衡方向的弛豫(relaxation),或称为Gilbert damping torque,第三项代表STT,即其他的来源于能量密度,尤其是电流诱导产生的转矩: \vec T=\tau_{\text{FL}}\vec m\times\vec \zeta+\tau_{\text{DL}}\vec m\times\left(\vec m\times \vec ...
[12].Controlling magnetism by interface engineering, L Herrera Diez & D Ravelosona, Book Magnetic Nano- and Microwires 2nd Edition, Elsevier (2020) [13].Reduced spin torque nano-oscillator linewidth using He+ irradiation, S Jiang & D Ravelosona & J Akerman, Appl. Phys. Lett. 116, 072403 ...
Spin torque and spin Hall effect nano-oscillators generate high intensity spin wave auto-oscillations on the nanoscale enabling novel microwave applications in spintronics, magnonics, and neuromorphic computing. For their operation, these devices require
In spin torque magnetic memories, electrically actuated spin currents are used to switch a magnetic bit. Typically, these require a multilayer geometry including both a free ferromagnetic layer and a second layer providing spin injection. For example, spin may be injected by a non-magnetic layer ...
Ferromagnetic resonance spectra affected by the spin-Hall effect (SHE) and the spin torque were measured for a Ni_(81)Fe_(19)/Pd bilayer film. A charge cur... K.,Ando,H.,... - 《Journal of Applied Physics》 被引量: 9发表: 2009年 Important role of magnetization precession angle meas...
We report a giant spin Hall effect (SHE) in -tantalum that generates spin currents intense enough to induce efficient spin-torque switching of ferromagnets at room temperature. We quantify this SHE by three independent methods and demonstrate spin-torque switching of both out-of-plane and in-...
Spin-orbit-torque 关于不同方向的自旋(磁矩,角动量)的相互作用分析,即spin dynamics,必须用到Landau‐LifhiLifshitz-Gilbert 方程(LLG)来分析。 \\\frac{dM}{dt}=-\gamma M\times H_{ex}+\frac{\alpha}{M_{s}}M\times \frac{dM}{dt} 第一项为保持进动的Field like (FL)torque,第二项为Gilbert ...
We present a study of precessional magnetization switching in orthogonal spin-torque spin-valve devices at low temperatures. The samples consist of a spin-polarizing layer that is magnetized out-of-the film plane and an in-plane magnetized free and reference magnetic layer separated by non-magnetic...