Brillouin Light Scattering Spectra as local Temperature Sensors for   Thermal Magnons and Acoustic Phonons
  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. 
Daniel R. Birt, Kyongmo An, Annie Weathers, Li Shi, Maxim Tsoi, and   Xiaoqin Li
cond-mat.mtrl-sci