Spin-transfer torque efficiency measured using a Permalloy nanobridge
Spin-transfer torque efficiency measured using a Permalloy nanobridge
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DOI：
10.1063/1.3520144
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发表时间：
2010-11-15
影响因子：
4
通讯作者：
Marrows, C. H.
中科院分区：
文献类型：
--
作者：
Hickey, M. C.;Ngo, D-T.;Marrows, C. H.
我们报告的磁阻，聚焦克尔效应，和洛伦兹显微镜实验进行纳米坡莫合金桥连接微米级垫。这些垫可以通过施加小磁场从平行状态切换到反平行状态，从而引起可检测的磁阻。我们表明，该开关场H-sw通过自旋转移力矩效应通过施加高电流密度（J（dc））来修改，所述自旋转移力矩效应由自旋电流与由器件几何形状产生的磁化梯度相互作用引起，得到自旋转移力矩效率xi=dH（sw）/dJ（dc）=0.027 +/- 0.001 Oe/MA cm（-2）的估计。(C)2010年美国物理学会。[doi：10.1063/1.3520144]
We report magnetoresistance, focused Kerr effect, and Lorentz microscopy experiments performed on a nanoscale Permalloy bridge connecting microscale pads. These pads can be switched from a parallel to antiparallel state through the application of small fields, causing a detectable magnetoresistance. We show that this switching field H-sw is modified by the application of a high current density (J(dc)) through spin-transfer torque effects, caused by the spin-current interacting with the magnetization gradients generated by the device geometry, yielding an estimate for the spin-transfer torque efficiency xi=dH(sw)/dJ(dc)=0.027 +/- 0.001 Oe/MA cm(-2). (C) 2010 American Institute of Physics. [doi:10.1063/1.3520144]