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arXiv 0910.3156cond-mat.mtrl-sci
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通过SiO2隧道势垒向Si(001)注入电自旋

Electrical spin injection into Si(001) through a SiO2 tunnel barrier

C. H. Li, G. Kioseoglou, O. M. J. van t Erve, P. E. Thompson, B. T. Jonker

摘要:

我们证明了自旋极化隧道从Fe通过SiO2隧道势垒到Si n-i-p异质结。传输测量表明,单步隧穿是占主导地位的传输机制。电致发光(EL)的圆极化Pcirc表明隧穿自旋极化反映了Fe多数自旋。Pcirc跟踪Fe磁化,证实在Si中辐射重组的自旋极化电子源自Fe。速率方程分析提供了一个下限为30%的电子自旋极化在Si中在5 K。

英文摘要:

We demonstrate spin polarized tunneling from Fe through a SiO2 tunnel barrier into a Si n-i-p heterostructure. Transport measurements indicate that single step tunneling is the dominant transport mechanism. The circular polarization, Pcirc, of the electroluminescence (EL) shows that the tunneling spin polarization reflects Fe majority spin. Pcirc tracks the Fe magnetization, confirming that the spin-polarized electrons radiatively recombining in the Si originate from the Fe. A rate equation analysis provides a lower bound of 30% for the electron spin polarization in the Si at 5 K.

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