arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2207.03311cond-mat.mtrl-sci
收藏

Cr2O3/Co/Pt三层膜中交换偏置对磁场和电流驱动磁畴壁运动的控制

Control of field- and current-driven magnetic domain wall motion by exchange-bias in Cr2O3/Co/Pt trilayers

B. J. Jacot, S. Vèlez, P. Noël, P. Helbingk, F. Binda, C. -H. Lambert, P. Gambardella

摘要:

研究了在垂直磁化的交换偏置系统中,磁场和电流驱动的自旋轨道矩驱动下磁畴壁的运动。以Cr_2O_3/Co/Pt三层膜为模型系统,Co层的磁化强度可以是面外或面内交换偏置,这取决于场冷却方向.在场驱动实验中,面内交换偏置有利于具有平行于交换偏置场的内部磁化的畴壁的传播。在电流驱动的实验中,畴壁沿电流方向传播,但畴壁速度增加和减少对称(反对称)的两个电流极性时,交换偏置是平行(垂直)的电流线。在零外场下,交换偏置将电流驱动的畴壁运动速度修改了十倍。我们还发现,交换偏置在外场高达15 kOe和ns长电流脉冲下保持稳定,电流密度高达3.5 × 10^12 A/m^2。我们的研究结果表明,多功能的控制域壁运动的交换偏置,这是相关的实现无场切换的磁化垂直系统和电流驱动的操纵域壁速度自旋电子器件。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑