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Publication Citation: Chirality from interfacial spin-orbit coupling effects in magnetic bilayers

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Author(s): Kyoung-Whan Kim; Hyun-Woo Lee; Kyung Jin Lee; Mark D. Stiles;
Title: Chirality from interfacial spin-orbit coupling effects in magnetic bilayers
Published: November 19, 2013
Abstract: Spin-orbit coupling causes many properties that make magnets technologically important as well as properties that interfere with optimal performance. As nanomagnetic devices scale to smaller sizes, spin-orbit coupling due to the broken structural inversion symmetry at interfaces becomes increasingly important. Here we use a minimal two-dimensional model of itinerant electrons near the interface to show that the interfacial spin-orbit coupling generates chiral effects such as the interfacial Dzyaloshinskii-Moriya interaction, chiral spin torques, and spin-dependent chiral electromagnetic fields. All these effects are mutually correlated and are related through a curved space description. The latter reveals the frustration in magnetic ground state. In magnetic bilayers, these chiral effects lead to very efficient current-induced magnetization dynamics. Such effects may also be relevant for high-mobility two-dimensional electron gas at the interface between insulating oxides.
Citation: Physical Review Letters
Volume: 111
Issue: 21
Keywords: Spintronics; magnetic dynamics; spin-orbit coupling; Rashba interaction; itinerant electrons; Dzyaloshinskii-Moriya interaction; Chirality; magnetic bilayers
Research Areas: Nanomagnetics
DOI: http://dx.doi.org/10.1103/PhysRevLett.111.21  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (920KB)