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首页> 外文期刊>Physical review >Detecting and switching magnetization of Stoner nanograin in nonlocal spin valve
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Detecting and switching magnetization of Stoner nanograin in nonlocal spin valve

机译：非局部自旋阀中斯托纳纳米颗粒的检测和开关磁化

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摘要

The magnetization detection and switching of an ultrasmall Stoner nanograin in a nonlocal spin valve (NLSV) device is studied theoretically. With the help of the rate equations, a unified description can be presented on the same footing for the NLSV signal that reads out the magnetization, and for the switching process. The setup can be viewed as that the grain is connected to two nonmagnetic leads via sequential tunneling. In one lead, the chemical potentials for spin-up and -down electrons are split due to the spin injection in the NLSV. This splitting (or the spin bias) is crucial to the NLSV signal and the critical condition to the magnetization switching. By using the standard spin diffusion equation and parameters from recent NLSV device, the magnitude of the spin bias is estimated and found large enough to drive the magnetization switching of the cobalt nanograin reported in earlier experiments. A microscopic interpretation of NLSV signal in the sequential tunneling regime is thereby raised, which show properties due to the ultrasmall size of the grain. The dynamics at the reversal point shows that there may be a spin-polarized current instead of the anticipated pure spin current flowing during the reversal due to the electron accumulation in the floating lead used for the readout of NLSV signal.
机译：理论上研究了非局部自旋阀（NLSV）装置中超小斯托纳纳米颗粒的磁化检测和转换。借助速率方程，可以在相同的基础上针对读取磁化强度的NLSV信号以及开关过程提供统一的描述。可以将设置视为晶粒通过顺序隧穿连接到两个非磁性引线。在一根导线中，由于NLSV中的自旋注入，上旋和下旋电子的化学势被分开。这种分裂（或自旋偏置）对于NLSV信号至关重要，对于磁化开关也至关重要。通过使用标准的自旋扩散方程式和最近的NLSV装置的参数，可以估算自旋偏压的大小，并发现其大小足以驱动先前实验中报道的钴纳米晶粒的磁化转换。从而提高了在连续隧穿状态下对NLSV信号的微观解释，这归因于晶粒的超小尺寸而显示出特性。反转点的动力学表明，由于用于NLSV信号读出的浮线中的电子积累，反转期间可能存在自旋极化电流，而不是预期的纯自旋电流流动。

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