1212.1520 (Daniel R. Birt et al.)

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

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.

View original: http://arxiv.org/abs/1212.1520