| 简介 |
PROBLEM TO BE SOLVED : To provide a rare earth magnet which is superior in corrosion resistance and can obtain a superior magnetic characteristic and to provide a manufacturing method of the magnet.
SOLUTION : The magnet has a magnet element assembly 10 including a rare earth element and a protection film 20 formed in the magnet element assembly 10. In the protection film 20, a p-type semiconductor layer 21 and an n-type semiconductor layer 22 are laminated in this order from a side of the magnet element assembly 10, and a pn junction is formed between the p-type semiconductor layer 21 and the n-type semiconductor layer 22. Thus, discharge of electrons from the magnet element assembly 11 is suppressed and corrosion is suppressed. An oxide semiconductor is desirable as a semiconductor constituting the p-type semiconductor layer 21 and the n-type semiconductor layer 22, and thickness of the protection film 20 is desirable to be less than 5 μm. |
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