Natural ferromagnetic resonance in Fe3O4 and gamma-Fe2O3 is discussed, noting especially the broad region of resonance and a permeability appreciably less than unity. Values of the internal anisotropic magnetic field intensity for Fe3O4 and are calculated. It is shown that the absorption mechanism cannot be represented by an idealized damped oscillator or Gaussian absorption mechanism. An explanation of the observed ferromagnetic resonance is offered. Natural ferromagnetic resonance in Fe3O4 and gamma-Fe2O3 is discussed, noting especially, the broad region of resonance and a permeability appreciably less than unity Values of the internal anisotropic magnetic field intensity for Fe3O4 and are calculated. It is shown that the absorption mechanism cannot be represented by an idealized damped oscillator or Gaussian absorption mechanism. An explanation of the observed ferromagnetic resonance is offered.
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G. E. Crouch (1949) studied this question.
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