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To improve the driving sensitivity of an optical pickup actuator for high density and high speed, we present a new magnetizing method-concentrated anisotropic magnetization for Nd-Fe-B sintered magnets. The electromagnetic field analysis applying 3-D FEM was performed and several samples were actually tested. From comparing simulated data with experimental results, we verified the accuracy of the simulation and the superiority of the presented method.
Choi et al. (Sat,) studied this question.
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