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Thickness dependence and the role of spin transfer torque in nonlinear giant magnetoresistance of permalloy dual spin valves

机译:厚度依赖性和自旋传递扭矩在坡莫合金双自旋阀非线性巨磁电阻中的作用

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摘要

The recent discovery of nonlinear current-dependent magnetoresistance in dual spin valve devices [A. Aziz, O. P. Wessely, M. Ali, D. M. Edwards, C. H. Marrows, B. J. Hickey, and M. G. Blamire, Phys. Rev. Lett. 103, 237203 (2009)] opens up the possibility for distinct physics which extends the standard model of giant magnetoresistance. When the outer ferromagnetic layers of a dual spin valve are antiparallel, the resulting accumulation of spin in the middle ferromagnetic layer strongly modifies its bulk and interfacial spin asymmetry and resistance. Here, we report experimental evidence of the role of bulk spin accumulation in this nonlinear effect and show that interfacial spin accumulation alone cannot account for the observed dependence of the effect on the thickness of the middle ferromagnetic layer. It is also shown that spin torque acting on the middle ferromagnetic layer combined with the nonlinear effect might be useful in understanding the dynamical features associated with the nonlinear behavior.
机译:双自旋阀装置中非线性电流相关磁阻的最新发现[A.阿齐兹(Oz P. Wessely),阿里(M. Ali),爱德华兹(D.M. Edwards),希洛斯(C.H.牧师103,237203(2009)]为不同的物理学开辟了可能性,从而扩展了巨磁阻的标准模型。当双自旋阀的外部铁磁层反平行时,中间铁磁层中自旋的累积结果会极大地改变其体积和界面自旋不对称性和电阻。在这里,我们报告了整体自旋累积在这种非线性效应中的作用的实验证据,并表明仅界面自旋累积不能解释所观察到的对中间铁磁层厚度的依赖性。还表明,作用在中间铁磁层上的自旋扭矩与非线性效应相结合,可能有助于理解与非线性行为相关的动力学特征。

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