Ferromagnetic Resonance in Nickel Ferrite

Abstract

The ferromagnetic resonance phenomenon in single crystals of NiO ${\mathrm{Fe}}_2$ ${\mathrm{O}}_3$ has been studied at room temperature at 24,000 Mc/sec. Small samples were used in order to avoid electromagnetic cavity-type resonances. The $g$-factor observed is 2.19. The first-order magnetocrystalline anisotropy constant $K_1$ was found to be -6.27×${10}^4$ ergs/cc. The absorption line was very narrow (half-widths less than 100 oersteds) and fit a resonance curve quite satisfactorily.