Spin-Wave Spectrum of Yttrium Iron Garnet
- 1 December 1960
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 120 (5), 1612-1614
- https://doi.org/10.1103/physrev.120.1612
Abstract
The spin-wave spectrum of yttrium iron garnet is treated using a Hamiltonian involving nearest-neighbor , , and isotropic exchange interactions. Values of the exchange constants are estimated from the molecular field constants of Pauthenet. Anisotropy and magnetic dipole-dipole interactions are neglected. Twenty spin-wave modes are found, and their energies calculated at points of cubic symmetry in k space. The dispersion relation of the single "acoustical" spin-wave mode is found to agree with the value previously reported by Meyer and Harris.
Keywords
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