Thermal transport in yttrium iron garnet at very high magnetic fields

Ratkovski, D. R.; Balicas, L.; Bangura, A.; Machado, F. L. A.; Rezende, S. M.

doi:10.1103/physrevb.101.174442

Thermal transport in yttrium iron garnet at very high magnetic fields

Journal Article · Thu May 28 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.101.174442· OSTI ID:1774092

^[1]; ^[2]; Bangura, A. ^[2]; ^[3]; ^[4]

National High Magnetic Field Laboratory, Tallahassee, FL (United States); Univ. Federal de Pernambuco, Recife (Brazil); Florida State University
National High Magnetic Field Laboratory, Tallahassee, FL (United States)
National High Magnetic Field Laboratory, Tallahassee, FL (United States); Univ. Federal de Pernambuco, Recife (Brazil)
Univ. Federal de Pernambuco, Recife (Brazil)

The ferrimagnetic insulator yttrium iron garnet (YIG) is one of the most important materials in the active fields of insulator-based spintronics and spin caloritronics. Nevertheless, and despite the fact that this material has been studied for over six decades, the thermal properties of magnons in YIG have not been sufficiently characterized, mainly because at not very low temperatures they are overwhelmed by the contribution of phonons. Here, we report measurements of the thermal conductivity in YIG under magnetic fields up to 31.4 T to increase the magnon energy gap, to suppress the magnon contribution, and to isolate that of the phonons relative to theirbehavior at zero field. We observe that at a temperature of 20 K, even with a field as large as 31.4 T, the magnon contribution is not completely suppressed. In conclusion, the magnon thermal conductivity, measured by subtracting the value of the total thermal conductivity at 31.4 T from the value at zero field, has a peak at 16 K, with an amplitude thatis over five times larger than the one obtained by measuring under a field of only 7 T, as previously reported.

View Accepted Manuscript (DOE)

Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0002613

OSTI ID:: 1774092

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 17 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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