论文标题
合成反铁磁铁通过层间dzyaloshinskii-moriya相互作用的无野旋转轨道扭矩切换
Field-free spin orbit torque switching of synthetic antiferromagnet through interlayer Dzyaloshinskii-Moriya interaction
论文作者
论文摘要
对于下一代超快，高密度自旋记忆和逻辑设备，垂直的合成抗铁磁铁（SAFS）是感兴趣的。但是，为了通过电流诱导的旋转轨道扭矩（SOT）有效地有效地操作其磁性，通常需要一个不希望的高外部场才能打破对称性。在这里，我们通过引入层间dzyaloshinskii-Moriya相互作用（DMI），从理论上和实验上证明了垂直SAF的无场SOT切换。通过宏自旋模拟，我们表明，无场开关的速度随着注射旋转的平面镜不对称而增加。我们通过方位角依赖的异常霍尔测量值在实验中观察到SAF样品中层间DMI的存在。在这样的样本中完成了无场开关，有效开关场的强度证明了其来自Interlayer DMI的起源。我们的结果为基于SAF的高性能SOT设备提供了新的策略。
Perpendicular synthetic antiferromagnets (SAFs) are of interest for the next generation ultrafast, high density spintronic memory and logic devices. However, to energy efficiently operate their magnetic order by current-induced spin orbit torques (SOTs), an unfavored high external field is conventionally required to break the symmetry. Here, we theoretically and experimentally demonstrate the field-free SOT switching of a perpendicular SAF through the introduction of interlayer Dzyaloshinskii-Moriya interaction (DMI). By macro-spin simulation, we show that the speed of field-free switching increases with the in-plane mirror asymmetry of injected spins. We experimentally observe the existence of interlayer DMI in our SAF sample by an azimuthal angular dependent anomalous Hall measurement. Field-free switching is accomplished in such a sample and the strength of the effective switching field demonstrates its origin from interlayer DMI. Our results provide a new strategy for SAF based high performance SOT devices.
