Optical Cooling of Magnons

Sanchar Sharma, Yaroslav M. Blanter, Gerrit E.W. Bauer

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)


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, 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.

Original languageEnglish
Article number087205
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 2018 Aug 22


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