Asymmetric Bias Dependence in Double Spin Filter Tunnel Junctions

Autor:	Miao, G. X., Moodera, J. S.
Rok vydání:	2009
Předmět:	Condensed Matter - Materials Science
Zdroj:	J. Appl. Phys. 106, 023911 (2009)
Druh dokumentu:	Working Paper
DOI:	10.1063/1.3176894
Popis:	In double spin filter (SF) tunnel junctions, the spin information is generated and analyzed purely from the SF effect with nonmagnetic electrodes. In this article we numerically evaluate the bias dependence of magnetoresistance in such tunnel junctions (nonmagnetic metal / SF / nonmagnetic insulator / SF / nonmagnetic metal), particularly in cases when different SF materials are utilized. A large magnetoresistance with nonmonotonic and asymmetric bias dependence is expected within the frame of WKB approximation. We illustrate the systematic influence of tunnel barrier height, tunnel barrier thickness, and exchange energy splitting on magnetoresistance, particularly focusing on the asymmetric behavior of the magnetoresistance bias dependence. Comment: submitted to J. Appl. Phys. on Feb.12, 2009
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0904.4468 Zobrazit plný text záznamu View this record from Arxiv