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The first use of linear magnetic birefringence (optical Cotton-Mouton effect) to observe a magnetic resonance is reported. This allows us to make the first direct observation of resonant motion of a ferromagnetic vortex. This vortex is present in an easy-plane garnet film at the intersection of two 90^∘{} N\'eel walls. Agreement between the resonant frequencies and our theory confirms a previously proposed equation of vortex motion.
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Argyle et al. (1984) studied this question.
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