偏压可调的铁磁-肖特基金属和半导体纳米电子自旋过滤器

摘要

在半导体异质结上沉积一条纳米级的铁磁条带和一条肖特基金属条带可获得一个电子自旋过滤器.采用转移矩阵法,我们研究了偏压对该电子自旋过滤器中电子自旋过滤性质的影响.通过数值计算,我们发现,该电子自旋过滤器中,电子自旋极化的幅度和符号与偏压密切相关,这可用来制造一个偏压可调的电子自旋过滤器.%An electron-spin filter was proposed by depositing a nanosized ferromagnetic metal stripe and a Schottky normal metal stripe on the top of the semiconductor hetero-structure.Based on transfer-matrix method,we investigate the effect of bias on electron-spin polarization in the spin filter.By numerical simulations,we found that not only the amplitude of the electron-spin polarization but also its sign varies with the bias,giving rise to a bias-tunable spin filter.