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

Citation:

D. R. Birt, An, K. M., Weathers, A., Shi, L., Tsoi, M., and Li, X. Q., “"Brillouin Light Scattering Spectra as Local Temperature Sensors for Thermal Magnons and Acoustic Phonons,” Appl. Phys. Lett., vol. 102, pp. 082401, 2013.

Abstract:

We demonstrate the use of the micro-Brillouin light scattering (micro-BLS) technique as a local temperature sensor for magnons in a permalloy (Py) thin film and phonons in the glass substrate. When the Py film is uniformly heated, we observe a systematic shift in the frequencies of two thermally excited perpendicular standing spin wave modes. Fitting the temperature dependent magnon spectra allows us to achieve a temperature resolution better than 2.5 K. In addition, we demonstrate that the micro-BLS spectra can be used to measure the local temperature of magnons and the relative temperature shift of phonons across a thermal gradient. Such local temperature sensors are useful for investigating spin caloritronic and thermal transport phenomena in general.

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