Volume 117, Number 3, February 2017
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 March 2017|
Spin-orbit torque-driven magnetization switching in 2D-topological insulator heterostructure
1 Department of Chemistry, K. N. Toosi University of Technology - Shariati Ave, Tehran 15418-49611, Iran
2 Computational Physical Sciences Research Laboratory, School of Nano-Science, Institute for Research in Fundamental Sciences (IPM) - Farmanieh Ave, Tehran 19395-5531, Iran
3 Department of Physics, California State University - Northridge, CA 91330-8268, USA
Received: 26 June 2016
Accepted: 6 March 2017
Charge pumping and spin-orbit torque (SOT) are two reciprocal phenomena widely studied in ferromagnet (FM)/topological insulator (TI) heterostructures. However, the SOT and its corresponding switching phase diagram for a FM island in proximity to a two-dimensional topological insulator (2DTI) has not been explored yet. We have addressed these features, using the recently developed adiabatic expansion of time-dependent nonequilibrium Green's function (NEGF) in the presence of both precessing magnetization and bias voltage. We have calculated the angular and spatial dependence of different components of the SOT on the FM island. We determined the switching phase diagram of the FM for different orientations of the easy axis. The results can be used as a guideline for the future experiments on such systems.
PACS: 75.78.-n – Magnetization dynamics / 85.75.-d – Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields / 75.75.-c – Magnetic properties of nanostructures
© EPLA, 2017
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