Current Driven Domain Wall Motion in Rare-Earth Transition Metal Alloys with Perpendicular Magnetic Anisotropy
Current Driven Domain Wall Motion in Rare-Earth Transition Metal Alloys with Perpendicular Magnetic Anisotropy
复制标题
具有垂直磁各向异性的稀土过渡金属合金中电流驱动的畴壁运动
DOI：
10.1166/jnn.2012.6530
复制
发表时间：
2012
影响因子：
--
通讯作者：
Akimitsu Morisako
中科院分区：
文献类型：
--
作者：
Songtian Li;Xiaoxi Liu;Akimitsu Morisako
利用极磁光克尔效应显微镜研究了垂直磁化TbFeCo线在电流和磁场作用下的磁畴壁运动行为。发现沿着电子流动方向的磁畴壁蠕动的速度明显高于逆着电子流动的磁畴壁蠕动的速度，这是自旋转移矩效应的特征。通过采用改进的场驱动蠕动运动定律，通过将自旋转移扭矩视为添加到外场的有效场，确定 TbFeCo 线的自旋转移效率为 2.7 Oe cm2/106 A。高自旋转移效率表明，与面内磁化系统相比，TbFeCo 薄膜中具有尖锐畴壁的垂直磁化系统在基于自旋转移矩的器件中的应用表现出高度的优越性。
The domain wall movement behaviors under current combining with magnetic field in perpendicularly magnetized TbFeCo wire were studied by a polar magneto-optical Kerr effect microscope. The velocity for domain wall creeping along electrons flowing direction was found to be apparently higher than that of domain wall creeping against electrons flowing, which is the signature of the spin transfer torque effect. By employing the modified field-driven creep motion law, a spin transfer efficiency of 2.7 Oe cm2/106 A was determined for TbFeCo wire by treating the spin transfer torque as an effective field adding to the external field. The high spin transfer efficiency suggests that perpendicularly magnetized system with sharp domain walls in TbFeCo film shows high superiorities for applications in spin transfer torque based devices compared with in-plane magnetized systems.