论文标题
确定具有平面磁各向异性的异质结构中自旋轨道扭矩效率
Determination of spin-orbit torque efficiencies in heterostructures with in-plane magnetic anisotropy
论文作者
论文摘要
已经表明，重型过渡金属的自旋大厅效应可以产生足够的自旋轨道扭矩，并进一步在相邻的铁磁层中产生电流诱导的磁化。但是，如果铁磁层具有平面磁各向异性，则探测这种切换现象通常依赖于纳米尺寸磁性隧道连接，差分平面霍尔电压测量测量的磁力磁力测量值或KERR成像方法。我们表明，在带有自旋大厅金属的磁异质结构中，存在电流诱导的平面内旋霍尔有效磁场和单向磁磁性，可以改变其各向异性磁路震荡行为。我们还证明，通过在这种影响下分析各向异性磁倍率的响应，即使在微米大小的设备中，也可以直接和电探测器磁化磁化强度的开关。这种泵探针方法允许从旋转轨道扭矩切换事件中有效，直接确定关键参数，而无需冗长的设备制造过程。
It has been shown that the spin Hall effect from heavy transition metals can generate sufficient spin-orbit torque and further produce current-induced magnetization switching in the adjacent ferromagnetic layer. However, if the ferromagnetic layer has in-plane magnetic anisotropy, probing such switching phenomenon typically relies on tunneling magnetoresistance measurement of nano-sized magnetic tunnel junctions, differential planar Hall voltage measurement, or Kerr imaging approaches. We show that in magnetic heterostructures with spin Hall metals, there exist current-induced in-plane spin Hall effective fields and unidirectional magnetoresistance that will modify their anisotropic magnetoresistance behavior. We also demonstrate that by analyzing the response of anisotropic magnetoresistance under such influences, one can directly and electrically probe magnetization switching driven by the spin-orbit torque, even in micron-sized devices. This pump-probe method allows for efficient and direct determination of key parameters from spin-orbit torque switching events without lengthy device fabrication processes.
