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Phys Rev Lett. 2013 Nov 22;111(21):216601. Epub 2013 Nov 19.

Chirality from interfacial spin-orbit coupling effects in magnetic bilayers.

Author information

1
Basic Science Research Institute, Pohang University of Science and Technology, Pohang 790-784, Korea and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.

Abstract

As nanomagnetic devices scale to smaller sizes, spin-orbit coupling due to the broken structural inversion symmetry at interfaces becomes increasingly important. Here, we study interfacial spin-orbit coupling effects in magnetic bilayers using a simple Rashba model. The spin-orbit coupling introduces chirality into the behavior of the electrons and through them into the energetics of the magnetization. In the derived form of the magnetization dynamics, all of the contributions that are linear in the spin-orbit coupling follow from this chirality, considerably simplifying the analysis. For these systems, an important consequence is a correlation between the Dzyaloshinskii-Moriya interaction and the spin-orbit torque. We use this correlation to analyze recent experiments.

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