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arXiv · 1504.06042

Magnetization damping in noncollinear spin valves with antiferromagnetic interlayer couplings

Takahiro Chiba·Gerrit E. W. Bauer·Saburo Takahashi
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Abstract

We study the magnetic damping in the simplest of synthetic antiferromagnets, i.e. antiferromagnetically exchange-coupled spin valves in which applied magnetic fields tune the magnetic configuration to become noncollinear. We formulate the dynamic exchange of spin currents in a noncollinear texture based on the spindiffusion theory with quantum mechanical boundary conditions at the ferrromagnet|normal-metal interfaces and derive the Landau-Lifshitz-Gilbert equations coupled by the static interlayer non-local and the dynamic exchange interactions. We predict non-collinearity-induced additional damping that can be sensitively modulated by an applied magnetic field. The theoretical results compare favorably with published experiments.

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Takahiro Chiba, Gerrit E. W. Bauer, Saburo Takahashi. 2015-04-23. Magnetization damping in noncollinear spin valves with antiferromagnetic interlayer couplings. https://doi.org/10.1103/physrevb.92.054407

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