Study of magnon-phonon non-equilibrium in a magnetic insulator-Thulium iron garnet

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The non-equilibrium state between magnons and phonons is the key to understand the spin-caloric phenomena. We developed a unique optical reflectometry technique to spatially resolve Kerr angle ( theta K) and optical reflectance ( R) in a magnetic insulator-thulium iron garnet (TmIG). The TmIG was subjected to a thermal gradient to estimate populations of thermally excited magnons and phonons through the variation of theta K and R. The results showed that the spatial gradient of theta K is different from that of R, indicating the non-equilibrium state between magnons and phonons. Particularly, the characteristic decay length of theta K was significantly influenced by the heating power and the magnetic field, suggesting non-linear magnon scattering in a high magnon density regime. Our work not only provides a scheme to investigate the spatial profiles of magnons and phonons but also reveals the magnon-phonon non-equilibrium in TmIG. Hence, this report will stimulate further studies based on magnon-phonon non-equilibrium such as a transverse spin Seebeck effect and Bose-Einstein condensation.
Publisher
AIP Publishing
Issue Date
2021-10
Language
English
Article Type
Article
Citation

APPLIED PHYSICS LETTERS, v.119, no.15

ISSN
0003-6951
DOI
10.1063/5.0062751
URI
http://hdl.handle.net/10203/290114
Appears in Collection
PH-Journal Papers(저널논문)
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