Precession frequency and fast switching dependence on the in-plane and out-of-plane dual spin-torque polarizers
Precession frequency and fast switching dependence on the in-plane and out-of-plane dual spin-torque polarizers
复制标题
DOI：
10.1063/1.3700724
复制
发表时间：
2012-04
影响因子：
4
通讯作者：
Hong Zhang;Zhiwei Hou;Jianwei Zhang;Zongzhi Zhang;Yaowen Liu
中科院分区：
文献类型：
--
作者：
Hong Zhang;Zhiwei Hou;Jianwei Zhang;Zongzhi Zhang;Yaowen Liu
在具有面内（IP）和面外（OP）双极化器的自旋阀中，直流自旋极化电流可以激发稳定的磁化旋进。旋进频率与OP偏振器产生的自旋力矩强度成正比，但对IP偏振器不太敏感，这可以通过解析模型成功地解释。持续时间短至150 ps的单个电流脉冲能够驱动磁化切换。开关概率由自由层角φc的值决定，在该自由层角φc处，在停止电流脉冲之后，自由层磁化旋转转变为阻尼的小角度进动。
Steady magnetization precession can be excited by a DC spin-polarized current in a spin-valve with combined in-plane (IP) and out-of-plane (OP) dual polarizers. The precession frequency is proportional to the strength of spin-torque generated by the OP polarizer but less sensitive to the IP polarizer, which can be successfully interpreted by an analytic model. A single current pulse with its duration as short as 150 ps is able to drive the magnetization switching. The switching probability is dominated by the value of the free layer angle φc at which the free layer magnetization rotation transforms to a damped small angle precession after stopping the current pulse.