Analysis of Magnetization Mechanism for NdFeB Magnet Using Spin-Polarized Scanning Electron Microscopy (Spin SEM)
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概要
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The magnetization process of Nd-Fe-B bonded magnets prepared by the Hydrogenation-Disproportionation-Desorption-Recombination(HDDR) process was studied by observing magnetic domain structures using spin-polarized scanning electron microscopy (spin SEM). The positional relationship between the grain boundaries and the magnetic domain walls is clearly imaged. The result revealed that these magnets contain grains with a multi-domain structure in the thermally demagnetized state. The domain wall motions in grains with multi-domains are dominant in weak magnetic fields in the initial magnetization process, whereas fraction of the grains with a single domain increases with further increasing the magnetic field. The coercivity variations in these grains were also visualized.
- 2009-07-01
著者
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Nishiuchi T.
Neomax Company Hitachi Metals Ltd.
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Hirosawa S.
Neomax Company Hitachi Metals Ltd.
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KOHASHI T.
Central Research Laboratory, Hitachi, Ltd.
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MOTAI K.
Central Research Laboratory, Hitachi, Ltd.
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MAKI T.
NEOMAX Company, Hitachi Metals, Ltd.
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Motai K.
Central Research Laboratory Hitachi Ltd.
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Kohashi T.
Central Research Laboratory Hitachi Ltd.
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孝橋 照生
Central Research Laboratory, Hitachi, Ltd.
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甕 久美
Central Research Laboratory, Hitachi, Ltd.
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西内 武司
NEOMAX Company, Hitachi Metals, Ltd.