Monday, December 10, 2012

1212.1520 (Daniel R. Birt et al.)

Brillouin Light Scattering Spectra as local Temperature Sensors for
Thermal Magnons and Acoustic Phonons

Daniel R. Birt, Kyongmo An, Annie Weathers, Li Shi, Maxim Tsoi, Xiaoqin Li
We demonstrate the use of the micro-Brillouin light scattering (micro-BLS) technique as a local temperature sensor for magnons in a Permalloy thin film and phonons in the glass substrate. A systematic shift in the frequencies of two thermally excited perpendicular standing spin wave modes as the film is uniformly heated allows us to achieve a temperature resolution better than 2.5 K. We demonstrate that the micro-BLS spectra can be used to measure the local temperatures of phonons and magnons across a thermal gradient. Such local temperature sensors are useful for investigating spin caloritronic and thermal transport phenomena in general.
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