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Inverse spin-galvanic effect in the interface between a topological insulator and a ferromagnet
1Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada.
Physical Review Letters
|May 21, 2010
Summary
A Hall current in a topological insulator ferromagnet hybrid system can alter magnetic properties without energy loss. This discovery opens avenues for efficient, dissipationless current-induced magnetization reversal in advanced magnetic materials.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Topological insulators possess unique surface states with potential for novel electronic phenomena.
- Ferromagnet/topological insulator heterostructures exhibit a gapped surface state, forming a two-dimensional quantum Hall liquid.
Purpose of the Study:
- To investigate the influence of Hall current on the magnetic dynamics of ferromagnets in proximity to topological insulators.
- To explore the potential for dissipationless current-induced magnetization reversal.
Main Methods:
- Theoretical modeling of ferromagnet/topological insulator interfaces.
- Analysis of magnetization dynamics under induced Hall currents.
- Investigation of effective anisotropy field modulation.
Main Results:
- The induced Hall current significantly modifies the effective anisotropy field of the ferromagnet.
- This modulation is a dissipationless process, effective even in materials with weak spin-orbit coupling.
- Demonstrated the feasibility of current-induced magnetization reversal in thin-film ferromagnets.
Conclusions:
- Exploiting the interplay between topological surface states and ferromagnetism offers a pathway to control magnetization dynamics.
- Dissipationless control of magnetization via Hall currents presents opportunities for energy-efficient spintronic devices.
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