Journal of the Magnetics Society of Japan
Online ISSN : 1882-2932
Print ISSN : 1882-2924
Power Magnetics
Fabrication of Multipole Magnets with Enhanced Flux Density Using Anisotropic Bond Magnets for Miniature Optical Pickup Devices
Shinji IsogamiTakuya SakaiMasatoshi KanamaruYasunobu InabaMasami KojimaYoshihisa Kinoshita
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Volume 39 (2015) Issue 4 Pages 161-165

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  A prototype magnetizing fixture was designed based on magnetic flux patterns simulated using the three-dimensional finite-element method of the JMAG software package. Rectangular shaped anisotropic bond magnets with dimensions of 6×12×24 mm were magnetized to multipoles using the prototype and a pulse power source. The result was significant enhancement perpendicular to the surface component of magnetic flux density (Bz) in the hard-axis compared with Bz for conventional simple magnets, of which the front and back surfaces are magnetized to opposite polarities. Moreover, Bz reached the close value for the Halbach arrayed magnet, 0.24 T, with the same body size fabricated for the attainment target. The enhanced Bz was attributed to the cusp field formed by the flux from both side coils. Demonstrations indicated that the cusp field out of the easy-axis could be efficiently enhanced due to focusing of the flux.

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© 2015 The Magnetics Society of Japan
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