Spin-orbit torque-driven magnetization switching in 2D-topological insulator heterostructure

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 no...

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Bibliographic Details
Published in:Europhysics letters 2017-02, Vol.117 (3), p.37001-37001
Main Authors: Soleimani, Maryam, Jalili, Seifollah, Mahfouzi, Farzad, Kioussis, Nicholas
Format: Article
Language:English
Subjects:
75.75.-c
75.78.-n
85.75.-d
Ferromagnetism
Green's functions
Heterostructures
Insulators
Islands
Magnetic switching
Magnetization
Phase diagrams
Switching
Topological insulators
Topology
Torque
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Summary: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.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/117/37001