Neutron Scattering Study on Yttrium Iron Garnet for Spintronics

Yusuke Nambu, Shin Ichi Shamoto

Research output: Contribution to journalArticlepeer-review

Abstract

Spin current — a flow of the spin degree of freedom in matter — has vital importance in spintronics. Propagation of the spin current ranges over a whole momentum space; however, generated spin currents are mainly detected in the long-wavelength limit. To facilitate practical uses of spintronics and magnonics, microscopic understanding of the spin current is necessary. We here address yttrium iron garnet, which is a well-employed ferrimagnet for spintronics, and review in re the momentum- and energy-resolved characteristics of its magnetism. Using unpolarized neutrons, we refined its detailed crystal and magnetic structure, and examined magnetic excitations through four decades (10 µeV–100 meV) using chopper spectrometers in J-PARC, Japan. We also measured mode-resolved directions of the precessional motion of the magnetic moment, i.e., magnon polarization, which carries the spin current in insulators through polarized neutron scattering, using a triple-axis spectrometer in ILL, France. The magnon polarization is a hitherto untested fundamental property of magnets, affecting the thermodynamic properties of the spin current. Our momentum- and energy-resolved experimental findings provide an intuitive understanding of the spin current and demonstrate the importance of neutron scattering techniques for spintronics and magnonics.

Original languageEnglish
Article number081002
Journaljournal of the physical society of japan
Volume90
Issue number8
DOIs
Publication statusPublished - 2021 Aug 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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