期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
Spin-polarization and Magnetoresistance in Multi-channel Ferromagnetic Nanowire
摘要/Abstract
利用散射矩阵理论,研究了多通道纳米线结构中的量子化电导、自旋极化和弹道磁电阻.结果表明:在铁磁排列时,自旋简并解除,量子化电导以e2/h为单位变化,自旋极化率可以达到33%;随着纳米线宽度的减小,弹道磁电阻增长迅速;当线细到只有一种自旋态电子通过时,磁电阻达到无穷大,其自旋极化率为100%.
By using scattering matrix method, the quantized conductance, spin-polarization, and magnetoresistance in multi-channel ferromagnetic nanowire are calculated. The results indicate that , in ferromagnetic alignment , spin degeneracy is removed, quant ized conductance increases w ith the unit of e2/h, and spin-polarization can reache 33% .As the w idth of the nanow ire decreases, the magnetoresistance increases.When the w idth of the w ire is so small that only one spin state elect ron can tunnel the system, the magnetoresistance is infinity and the electron is completely spin-polarization.