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arXiv · 1804.02683

Optical cooling of magnons

Sanchar Sharma·Yaroslav M. Blanter·Gerrit E. W. Bauer
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Abstract

Inelastic scattering of light by spin waves generates an energy flow between the light and magnetization fields, a process that can be enhanced and controlled by concentrating the light in magneto-optical resonators. Here, we model the cooling of a sphere made of a magnetic insulator, such as yttrium iron garnet (YIG), using a monochromatic laser source. When the magnon lifetimes are much larger than the optical ones, we can treat the latter as a Markovian bath for magnons. The steady-state magnons are canonically distributed with a temperature that is controlled by the light intensity. We predict that such a cooling process can significantly reduce the temperature of the magnetic order within current technology.

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Sanchar Sharma, Yaroslav M. Blanter, Gerrit E. W. Bauer. 2018-04-08. Optical cooling of magnons. https://doi.org/10.1103/physrevlett.121.087205

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