论文标题
通过CR2O3/CO/PT Trilayers中的交换偏置控制场和电流驱动的磁域壁运动
Control of field- and current-driven magnetic domain wall motion by exchange-bias in Cr2O3/Co/Pt trilayers
论文作者
论文摘要
我们研究了具有垂直磁化的交换偏置系统中由磁场和电流驱动的自旋轨道驱动的磁域壁的运动。我们将CR2O3/CO/PT Trilayers视为模型系统，其中可以根据场冷却方向交换CO层的磁化磁化强度。在现场驱动的实验中，面内交换偏置有利于平行于交换偏置场的内部磁化磁化磁化壁的传播。在电流驱动的实验中，域壁沿着电流方向传播，但是当当前极性平行（垂直）与当前线时，当前极性时，域壁速度对两个当前极性对称地增加并降低（反对称性）。在零外场，交换偏置将电流驱动的域壁运动的速度修改为十倍。我们还发现，在高达15个KOE和NS长的电流脉冲的外部磁场下，交换偏置保持稳定，电流密度高达3.5x10^12 A/M^2。我们的结果表明，通过交换偏差对域壁运动的多功能控制与实现垂直系统中磁化的无现场切换以及域驱动的域壁速度在SpinTronic设备中的速度相关。
We investigate the motion of magnetic domain walls driven by magnetic fields and current-driven spin-orbit torques in an exchange-biased system with perpendicular magnetization. We consider Cr2O3/Co/Pt trilayers as model system, in which the magnetization of the Co layer can be exchanged-biased out-of-plane or in-plane depending on the field cooling direction. In field-driven experiments, the in-plane exchange bias favors the propagation of the domain walls with internal magnetization parallel to the exchange bias field. In current-driven experiments, the domain walls propagate along the current direction, but the domain wall velocity increases and decreases symmetrically (anti-symmetrically) for both current polarities when the exchange bias is parallel (perpendicular) to the current line. At zero external field, the exchange bias modifies the velocity of current-driven domain wall motion by a factor of ten. We also find that the exchange bias remains stable under external fields up to 15 kOe and ns-long current pulses with current density up to 3.5x10^12 A/m^2. Our results demonstrate versatile control of the domain wall motion by exchange bias, which is relevant to achieve field-free switching of the magnetization in perpendicular systems and current-driven manipulation of domain walls velocity in spintronic devices.
