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A different domain observation technique by modulation of a polarizing plane has been developed for Nd–Fe–B sintered magnets. A liquid crystal element inserted in a longitudinal Kerr microscope is used as an optical modulator to acquire a reference image needed to enhance Kerr contrast by image processing. Domain images of the Nd–Fe–B magnet can be clearly observed by this technique in a high magnetic field up to 4.4kOe. It was found that polishing of the sintered magnet reduced its coercive force.
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Takezawa et al. (2007) studied this question.
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