Controlling the Spin Torque Efficiency with Ferroelectric Barriers
Controlling the Spin Torque Efficiency with Ferroelectric Barriers
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DOI：
10.1103/physrevb.91.064412
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发表时间：
2012-11
期刊：
影响因子：
--
通讯作者：
A. Useinov;A. Manchon
中科院分区：
文献类型：
--
作者：
A. Useinov;A. Manchon
本文从理论上研究了含铁电势垒的磁性隧道结中的非平衡自旋输运。结合Bessel函数和Airy函数，得到了界面屏蔽下自由电子Schr“odinger隧穿方程的精确解.我们证明，自旋转移力矩效率，更一般的偏置依赖性的隧道磁电阻和电阻，可以通过切换铁电极化的障碍。这种效应提供了一种补充的方式来电控制自旋转移器件中的磁化强度和相关磁噪声的电流驱动动态。
Non-equilibrium spin-dependent transport in magnetic tunnel junctions comprising a ferroelectric barrier is theoretically investigated. The exact solutions of the free electron Schr\"odinger equation for electron tunneling in the presence of interfacial screening are obtained by combining Bessel and Airy functions. We demonstrate that the spin transfer torque efficiency, and more generally the bias-dependence of tunneling magneto- and electroresistance, can be controlled by switching the ferroelectric polarization of the barrier. This effect provides a supplementary way to electrically control the current-driven dynamic states of the magnetization and related magnetic noise in spin transfer devices.