Spin filtering and magnetoresistance in ballistic tunnel junctions

被引：62

作者：

Egues, JC ^{[1
]}

Gould, C

Richter, G

Molenkamp, LW

机构：

[1] Univ Sao Paulo, Inst Fis Sao Carlos, Dept Fis & Informat, BR-13560970 Sao Paulo, Brazil

[2] Univ Wurzburg, Inst Phys, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.64.195319

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We theoretically investigate magnetoresistance (MR) effects in connection with spin filtering in quantum-coherent transport through tunnel junctions based on nonmagnetic/semimagnetic heterostructures. We find that spin filtering in conjunction with the suppression/enhancement of the spin-dependent Fermi seas in semimagnetic contacts gives rise to (i) spin-split kinks in the MR of single barriers and (ii) a robust beating pattern in the MR of double barriers with a semimagnetic well. We believe these are unique signatures for quantum filtering.

引用

页数：5

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