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, CY; Han, JH; Lee, 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
- Files in This Item:
-
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.