Neutron-scattering study of yttrium iron garnet

Abstract

The nuclear and magnetic structure and full magnon dispersions of yttrium iron garnet Y${}_3$Fe${}_5$O${}_{12}$ have been studied by neutron scattering. The refined nuclear structure is distorted to a trigonal space group of $R\bar{3}$. The highest-energy dispersion extends up to 86 meV. The observed dispersions are reproduced by a simple model with three nearest-neighbor-exchange integrals between 16$a$ (octahedral) and 24$d$ (tetrahedral) sites, $J_{aa}$, $J_{ad}$, and $J_{dd}$, which are estimated to be 0.00$\pm$0.05, $-$2.90$\pm$0.07, and $-$0.35$\pm$0.08 meV, respectively. The lowest-energy dispersion below 14 meV exhibits a quadratic dispersion as expected from ferromagnetic magnons. The imaginary part of $q$-integrated dynamical spin susceptibility $\chi$"($E$) exhibits a square-root energy-dependence in the low energies. The magnon density of state is estimated from the $\chi$"($E$) obtained on an absolute scale. The value is consistent with a single polarization mode for the magnon branch expected theoretically.

arXiv comment9 pages, 9 figures

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• Magnonic Casimir Effect in Ferrimagnets
• Ultrafast Optomagnonics in Ferrimagnetic Multi-Sublattice Garnets
• Neutron Scattering Study on Yttrium Iron Garnet for Spintronics
• Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
• A model for coupled $4f-3d$ magnetic spectra: a neutron scattering study of the Yb$-$Fe hybridisation in Yb${}_3$Fe${}_5$O${}_{12}$
• Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets
• Spin Seebeck effect in two-sublattice ferrimagnets in the vicinity of $T_{\mathrm{C}}$