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采用转移矩阵法,研究了结构尺度对自旋过滤器中电子自旋极化特性的影响.该自旋过滤器可以通过在半导体异质结上沉积纳米尺度的铁磁条带和肖特基金属条带来实现.计算结果表明,电子的自旋极化特性强烈依赖于铁磁条带和肖特基金属条带的结构尺度和位置,即该器件中存在量子尺寸效应.此外,我们的计算结果还表明,电子的自旋极化特性还与施加在肖特基金属条上的电压所诱发的电垒高度密切相关.因此,我们可以通过改变施加在肖特基金属条上的电压来调控该器件中电子的自旋极化特性,制造一个电压可调的电子自旋过滤器.
The transfer matrix method is used to study the effect of structure scale on the spin polarization characteristics of the spin filter. The spin filter can be fabricated by depositing nanoscale ferromagnetic strips and Schottky metal on a semiconductor heterojunction The calculated results show that the spin polarization characteristics of the electron are strongly dependent on the structure scale and position of the ferromagnetic strip and Schottky metal strip, that is, the quantum size effect exists in the device. In addition, our calculation The results also show that the electron spin polarization is also closely related to the charge barrier induced by the voltage applied to the Schottky metal strip so that we can adjust the voltage applied to the Schottkey strip by changing the voltage The electron spin polarization in the device creates an electronically tunable voltage filter.