基于自旋转移扭矩的磁畴壁泵浦。

Magnetic domain wall pumping by spin transfer torque.

机构信息

Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.

出版信息

Phys Rev Lett. 2010 Apr 23;104(16):167205. doi: 10.1103/PhysRevLett.104.167205.

DOI:10.1103/PhysRevLett.104.167205

PMID:20482080

Abstract

We show that spin transfer torque from a direct spin-polarized current applied parallel to a magnetic domain wall (DW) induces DW motion in a direction independent of the current polarity. This unidirectional response of the DW to spin torque enables DW pumping--long-range DW displacement driven by an alternating current. Our numerical simulations reveal that DW pumping can be resonantly amplified through excitation of internal degrees of freedom of the DW by the current.

摘要

我们证明了沿平行于磁畴壁（DW）施加的直接自旋极化电流的自旋转移扭矩会导致 DW 在与电流极性无关的方向上运动。DW 对自旋扭矩的这种单向响应使 DW 泵送成为可能，即通过交流电流驱动 DW 的长程位移。我们的数值模拟表明，通过电流激发 DW 的内部自由度，可以对 DW 泵送进行共振放大。