Ferromagnetic Resonance in Ferroxdure

Abstract
Ferromagnetic resonance experiments have been performed on Ferroxdure at various microwave frequencies from 9000 Mc/sec to 50 000 Mc/sec. With no externally applied field a natural resonance occurs near 50 000 Mc/sec. With magnetic field applied perpendicular to the hexagonal axis, a double resonance occurs for frequencies below 50 000 Mc/sec, while with a field applied along the hexagonal axis a single resonance occurs above 50 000 Mc/sec. A theory is developed to explain the above results.

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