  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.
