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A high resolution Kerr magneto-optic apparatus has been used to study the motion of domain walls under oscillatory and step applied fields, in near-perfect nickel platelets. The results clearly indicate the existence of an intrinsic damping constant of the form defined by the Gilbert equation of motion, in reasonable agreement with ferromagnetic resonance (fmr) data obtained on similar platelets by Rodbell in 1965.
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Leaver et al. (1970) studied this question.
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