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A gyroremanent magnetisation in anisotropic magnetic material


An effect whereby an anisotropic magnetic material acquires a remanence on exposure to an alternating magnetic field (a.f.) is predicted from an analysis of the phenomenon of rotational remanent magnetisation (RRM). The remanence, which is of gyromagnetic origin, is produced even when there is no relative rotation between sample and field and all constant fields have been eliminated. The effect is demonstrated in magnetic recording tape and, as well as having important implications for a.f. demagnetisation techniques, may be relevant to magnetic recording processes.

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