Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.
Phys Rev Lett. 2012 May 25;108(21):217204. doi: 10.1103/PhysRevLett.108.217204. Epub 2012 May 23.
We study the excitation of spin waves in magnetic insulators by the current-induced spin-transfer torque. We predict preferential excitation of surface spin waves induced by an easy-axis surface anisotropy with critical current inversely proportional to the penetration depth and surface anisotropy. The surface modes strongly reduce the critical current and enhance the excitation power of the current-induced magnetization dynamics.
我们研究了电流诱导的自旋转移力矩对磁性绝缘体中自旋波的激发。我们预测了易轴各向异性引起的表面自旋波的优先激发，其临界电流与穿透深度和表面各向异性成反比。表面模式强烈降低了临界电流，并增强了电流诱导的磁化动力学的激发功率。
