Unconventional Hanle effect in a highly ordered CoFe/MgO/n-Si contact: non-monotonic bias and temperature dependence and sign inversion of the spin signal

作者：Jeon Kun Rok; Min Byoung Chul; Shin Il Jae; Park Chang Yup; Lee Hun Sung; Jo Young Hun; Shin Sung Chul^*

来源：New Journal of Physics, 2012, 14: 023014.

DOI：10.1088/1367-2630/14/2/023014

We report in this paper the unconventional bias and temperature dependence of the Hanle effect in a highly ordered CoFe/MgO/n-Si contact investigated by means of a three-terminal Hanle method. The spin signal and the effective spin lifetime obtained in this system show non-monotonic behavior with bias and temperature variations. Interestingly, the sign of the spin signal changes significantly with the bias voltage at a low temperature. The sign inversion is presumably ascribed to the contribution of interfacial resonant states formed at the CoFe/MgO interface or bound states in the Si surface during the spin extraction process.

• 出版日期2012-2-6