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Multi-orbital tight binding calculations for spin transfer torque in magnetic tunneling junctions SCIE SCOPUS

Title
Multi-orbital tight binding calculations for spin transfer torque in magnetic tunneling junctions
Authors
You, CYHan, JHLee, HW
Date Issued
2012-04-01
Publisher
AMER INST PHYSICS
Abstract
We investigate the spin transfer torque (STT) with multi-orbit tight binding model in the magnetic tunneling junctions (MTJs). So far, most of the theoretical works based on the non-equilibrium Keldysh Green's function method employ a single band model for the simplicity, except a few first principle studies. Even though the single band model captures main physics of STT in MTJ, multi-band calculation reveals new features of the STT that depend on band parameters, such as insulator bandgap, inter-band hopping energy of the ferromagnetic layer. We find that the sign change of perpendicular torkance with bandgap of the insulator layer, and when we allow the inter-band hopping, the bias dependences of perpendicular STT are dramatically changed, while no noticeable changes in parallel STT are found. (C) 2012 American Institute of Physics. [doi:10.1063/1.3671773]
URI
https://oasis.postech.ac.kr/handle/2014.oak/10649
DOI
10.1063/1.3671773
ISSN
0021-8979
Article Type
Article
Citation
Journal of Applied Physics, vol. 111, no. 7, page. 7C904, 2012-04-01
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