Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.71: Poster
Friday, March 27, 2009, 11:00–14:00, P1A
Spin-transfer torque in tunnel junctions: Comparison of ab initio and simple models — •Asma H. Khalil1, Arne G. Christen1, Paul M. Haney2, Mark D. Stiles2, and Christian Heiliger1 — 1I. Physikalisches Institut, Justus Liebig University Giessen, D-35392, Germany — 2Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899-6202, USA
Our reported ab initio calculations of the spin-transfer torque in Fe/MgO/Fe tunnel junctions are in excellent agreement with experimental results [1]. Simple model calculations give different results [2]. In particular, they show strong deviations from a linear bias voltage dependence of the in-plane torque even for small biases. In this contribution we analyze simple single band models for a large number of parameters to point out the difference between them and first principles calculation. With our results we show the importance of ab initio calculations. This work has been supported in part by the NIST-CNST/UMD-NanoCenter Cooperative Agreement.
[1] C. Heiliger and M.D. Stiles, Phys. Rev. Lett. 100, 186805 (2008)
[2] I. Theodonis, N. Kioussis, A. Kalitsov, M. Chshiev, and W. H. Butler, Phys. Rev. Lett. 97, 237205 (2008)