Safranski Christopher, Sun Jonathan Z, Xu Jun-Wen, Kent Andrew D
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA.
Center for Quantum Phenomena, Department of Physics, New York University, New York, New York 10003, USA.
Phys Rev Lett. 2020 May 15;124(19):197204. doi: 10.1103/PhysRevLett.124.197204.
An important goal of spintronics is to covert a charge current into a spin current with a controlled spin polarization that can exert torques on an adjacent magnetic layer. Here we demonstrate such torques in a two ferromagnet system. A CoNi multilayer is used as a spin current source in a sample with structure CoNi/Au/CoFeB. Spin torque ferromagnetic resonance is used to measure the torque on the CoFeB layer. The response as a function of the applied field angle and current is consistent with the symmetry expected for a torque produced by the planar Hall effect originating in CoNi. We find the strength of this effect to be comparable to that of the spin Hall effect in platinum, indicating that the planar Hall effect holds potential as a spin current source with a controllable polarization direction.
自旋电子学的一个重要目标是将电荷电流转换为具有可控自旋极化的自旋电流，该自旋电流可对相邻磁性层施加转矩。在此，我们在双铁磁体系统中展示了此类转矩。在具有CoNi/Au/CoFeB结构的样品中，CoNi多层膜被用作自旋电流源。自旋转矩铁磁共振用于测量CoFeB层上的转矩。作为外加磁场角度和电流函数的响应与源自CoNi的平面霍尔效应产生的转矩所预期的对称性一致。我们发现这种效应的强度与铂中的自旋霍尔效应相当，这表明平面霍尔效应作为具有可控极化方向的自旋电流源具有潜力。
