Abstract
The resonance frequencies of the magnetostatic modes are calculated for an antiferromagnetic sphere with a dc magnetic field applied along the direction of easy magnetization. For resonance at a fixed frequency, the separations between the various modes are of order 0.2 (2HexHA)½4πM/Hex Oe. The magnetostatic modes of canted antiferromagnets of the α-Fe2O3 type are also investigated. Application of the magnetostatic conditions and solution of the differential equation for the magnetic scalar potential for a spherical sample reveals separations between modes of order 0.1 (H0+HDM) 4πM/Hex Oe. These modes are associated with the low-frequency resonance near ω1=γ[2HexHA′ + H0+HDM)]½.
Published Version
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