Spin-Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
Spin-Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
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DOI：
10.1103/physrevlett.106.036601
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发表时间：
2011-01-20
影响因子：
8.6
通讯作者：
Buhrman, R. A.
中科院分区：
文献类型：
--
作者：
Liu, Luqiao;Moriyama, Takahiro;Buhrman, R. A.
我们证明了在具有强自旋轨道散射的薄膜中的自旋霍尔效应可以激发相邻铁磁薄膜中的磁旋进。通过Pt/NiFe双层的交流电流的流动在Pt中产生振荡的横向自旋电流，并且所得到的自旋角动量到NiFe的转移诱导铁磁共振动力学。来自电流的奥斯特场也产生铁磁共振信号，但具有不同的对称性。这两个信号的比率允许定量确定自旋电流和自旋霍尔角。
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. The flow of alternating current through a Pt/NiFe bilayer generates an oscillating transverse spin current in the Pt, and the resultant transfer of spin angular momentum to the NiFe induces ferromagnetic resonance dynamics. The Oersted field from the current also generates a ferromagnetic resonance signal but with a different symmetry. The ratio of these two signals allows a quantitative determination of the spin current and the spin Hall angle.