First-Principles Study of Exchange Interactions of Yttrium Iron Garnet

Abstract

Yttrium Iron Garnet is the ubiquitous magnetic insulator used for studying pure spin currents. The exchange constants reported in the literature vary considerably between different experiments and fitting procedures. Here we calculate them from first-principles. The local Coulomb correction (U - J) of density functional theory is chosen such that the parameterized spin model reproduces the experimental Curie temperature and a large electronic band gap, ensuring an insulating phase. The magnon spectrum calculated with our parameters agrees reasonably well with that measured by neutron scattering. A residual disagreement about the frequencies of optical modes indicates the limits of the present methodology.

8 pages, 5 figures

References in corpus (4)

• Spin Seebeck insulator
• Theory of magnon-driven spin Seebeck effect
• Thermal spin dynamics of yttrium iron garnet
• First-principles study of the lattice and electronic structures of TbMn${}_2$O${}_5$

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• Strain-Tunable Magnetic Compensation Temperature of Epitaxial Tb${}_3$Fe${}_5$O${}_{12}$ Thin Films
• Magnon hybridization in ferrimagnetic heterostructures
• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• Ultrafast Optomagnonics in Ferrimagnetic Multi-Sublattice Garnets
• Effect of Non-Heisenberg Magnetic Interactions on Defects in Ferromagnetic Iron
• Neutron Scattering Study on Yttrium Iron Garnet for Spintronics
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