Thermal spin dynamics of yttrium iron garnet

Joseph Barker, Gerrit E.W. Bauer

Research output: Contribution to journalArticleScientificpeer-review

59 Citations (Scopus)
19 Downloads (Pure)

Abstract

The magnetic insulator yttrium iron garnet can be grown with near perfection and is therefore and ideal conduit for spin currents. It is a complex material with 20 magnetic moments in the unit cell. In spite of being a ferrimagnet, YIG is almost always modeled as a simple ferromagnet with a single spin wave mode. We use the method of atomistic spin dynamics to study the temperature evolution of the full spin wave spectrum, in quantitative agreement with neutron scattering experiments. The antiferromagnetic or optical mode is found to suppress the spin Seebeck effect at room temperature and beyond due to thermally pumped spin currents with opposite polarization to the ferromagnetic mode.

Original languageEnglish
Article number217201
Number of pages5
JournalPhysical Review Letters
Volume117
Issue number21
DOIs
Publication statusPublished - 14 Nov 2016

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