Current-induced spin torque resonance of a magnetic insulator
Current-induced spin torque resonance of a magnetic insulator
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磁绝缘体的电流感应自旋扭矩共振
DOI：
10.1103/physrevb.92.144411
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and Sebastian T. B. Goennenwein
中科院分区：
文献类型：
--
作者：
Michael Schreier;Takahiro Chiba;Arthur Niedermayr;Johannes Lotze;Hans Huebl;Stephan Geprags;Saburo Takahashi;Gerrit E. W. Bauer;Rudolf Gross;and Sebastian T. B. Goennenwein
我们报道了在钇铁石榴石/铂双层膜中观察到的电流诱导自旋扭矩共振。在铂中的交流充电电流atfrequencies引起直流自旋泵和自旋霍尔磁阻整流电压，由交流电流的奥斯特场和自旋霍尔效应介导的自旋转移力矩引起。在钇铁石榴石薄膜中，我们观察到自旋转移力矩驱动的磁化动力学是显着大于由交流奥斯特场产生的。因此，自旋转移力矩也在磁性绝缘体中有效地耦合电荷电流和磁化动力学，使得磁性绝缘体与微波器件的基于电荷电流的接口成为可能。
We report the observation of current-induced spin torque resonance in yttrium iron garnet/platinum bilayers. An alternating charge current atfrequencies in the platinum gives rise to dc spin pumping and spin Hall magnetoresistance rectification voltages, induced by the Oersted fields of the ac current and the spin Hall effect-mediated spin transfer torque. In ultrathin yttrium iron garnet films, we observe spin transfer torque actuated magnetization dynamics which are significantly larger than those generated by the ac Oersted field. Spin transfer torques thus efficiently couple charge currents and magnetization dynamics also in magnetic insulators, enabling charge current-based interfacing of magnetic insulators with microwave devices.