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Millimetre microwaves and pulsed magnetic fields have been used to investigate the magnetic resonances in a‐Fe2O3. Above the field and temperature induced phase boundary the coupling of the two weak‐ferromagnetic resonance modes has been observed. The coupling equation has been derived taking into account second anisotropy, basal plane anisotropy and magnetostriction. Below the phase boundary the antiferromagnetic resonance modes have been investigated and the resonance equations derived for the field in the basal plane. The observation of the phase boundary using a conventional resonance spectrometer has been satisfactorily interpreted in terms of the large changes in susceptibility which a numerical analysis shows often occur at or near this boundary. A small quantitative difference has been shown to exist between phenomenological theory and experiment at high magnetic fields.
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Morrison et al. (1973) studied this question.
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