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The ferromagnetic resonance phenomenon in single crystals of NiO Fe₂O₃ 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 K₁ was found to be -6. 2710^4 ergs/cc. The absorption line was very narrow (half-widths less than 100 oersteds) and fit a resonance curve quite satisfactorily.
Yager et al. (Wed,) studied this question.
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