Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy

Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and... In the field of spin caloritronics, knowledge of the magnon temperature is crucial. We investigate the temperature sensing capabilities of Brillouin light scattering (BLS), a technique which is commonly used in studying magnons. The magnon BLS spectra are characterized by three parameters: peak frequency, linewidth, and integrated intensity, each of which can be used for temperature sensing. The BLS spectra of magnons in both an insulator (yttrium iron garnet or YIG) and a metal (permalloy Ni80Fe20 or Py) are measured at different temperatures as the sample is uniformly heated. Unexpectedly, we find the temperature dependence of the BLS integrated intensity is opposite between YIG and Py. The mechanisms contributing to the temperature dependence of the three BLS spectra parameters are discussed and the temperature precision of each parameter is determined. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy

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Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy

Abstract

In the field of spin caloritronics, knowledge of the magnon temperature is crucial. We investigate the temperature sensing capabilities of Brillouin light scattering (BLS), a technique which is commonly used in studying magnons. The magnon BLS spectra are characterized by three parameters: peak frequency, linewidth, and integrated intensity, each of which can be used for temperature sensing. The BLS spectra of magnons in both an insulator (yttrium iron garnet or YIG) and a metal (permalloy Ni80Fe20 or Py) are measured at different temperatures as the sample is uniformly heated. Unexpectedly, we find the temperature dependence of the BLS integrated intensity is opposite between YIG and Py. The mechanisms contributing to the temperature dependence of the three BLS spectra parameters are discussed and the temperature precision of each parameter is determined.
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Publisher
American Physical Society (APS)
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.024448
Publisher site
See Article on Publisher Site

Abstract

In the field of spin caloritronics, knowledge of the magnon temperature is crucial. We investigate the temperature sensing capabilities of Brillouin light scattering (BLS), a technique which is commonly used in studying magnons. The magnon BLS spectra are characterized by three parameters: peak frequency, linewidth, and integrated intensity, each of which can be used for temperature sensing. The BLS spectra of magnons in both an insulator (yttrium iron garnet or YIG) and a metal (permalloy Ni80Fe20 or Py) are measured at different temperatures as the sample is uniformly heated. Unexpectedly, we find the temperature dependence of the BLS integrated intensity is opposite between YIG and Py. The mechanisms contributing to the temperature dependence of the three BLS spectra parameters are discussed and the temperature precision of each parameter is determined.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 28, 2017

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