High-temperature thermal conductivity of yttrium and rare-earth iron garnets
Résumé
Yttrium and rare-earth iron garnets (R3Fe3O12) are ferrimagnetic insulators that have been widely studied for magnetic and spintronic applications. In this study, we report the thermal conductivity (κ) between 300 and 773 K for the single crystals of R3Fe3O12, where R = Y, Gd, Dy, and Yb. For Y3Fe3O12, the κ up to the Curie temperature (TRC ≈ 555 K) can be described well with a pure phononic model, without considering conduction or scattering by the magnons. The iron garnets containing magnetic rare-earth ions exhibit smaller κ, with Dy3Fe3O12 showing the smallest values due to the strong interactions of heat-carrying phonons with the crystal field excitations of Dy3+ ions.
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