The Final Chapter In The Saga Of YIG

Abstract

The magnetic insulator Yttrium Iron Garnet can be grown with exceptional quality, has a ferrimagnetic transition temperature of nearly 600 K, and is used in microwave and spintronic devices that can operate at room temperature. The most accurate prior measurements of the magnon spectrum date back nearly 40 years, but cover only 3 of the lowest energy modes out of 20 distinct magnon branches. Here we have used time-of-flight inelastic neutron scattering to measure the full magnon spectrum throughout the Brillouin zone. We find that the existing model of the excitation spectrum, well known from an earlier work titled "The Saga of YIG", fails to describe the optical magnon modes. Using a very general spin Hamiltonian, we show that the magnetic interactions are both longer-ranged and more complex than was previously understood. The results provide the basis for accurate microscopic models of the finite temperature magnetic properties of Yttrium Iron Garnet, necessary for next-generation electronic devices.

arXiv comment10 pages, 3 figures, 4 supplementary figures, 1 table, 1 supplementary table

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• Motion-induced spin transfer
• Theoretical analysis of glide-Z_2 magnetic topological photonic crystals
• Mechanism for a Chemical Potential of Nonequilibrium Magnons in Parametric Parallel Pumping
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• Hybrid magnetization dynamics in ${\text{Cu}}_{\text{2}}{\text{OSeO}}_{\text{3}}$/$\mathrm{NiFe}$ heterostructures
• Spin Seebeck effect in two-sublattice ferrimagnets in the vicinity of $T_{\mathrm{C}}$
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• Anisotropic Band-Split Magnetism in Magnetostrictive CoFe${}_2$O${}_4$
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• Unified theory of magnetization temperature dependence in ferrimagnets
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• Origin and dynamics of umbrella states in rare-earth iron garnets
• Ellipticity effects on diffusive magnon spin and heat transport in easy-plane ferromagnets
• Unquenched orbital angular momentum as the origin of spin inertia