A manufacturing method of a permanent magnet for a hard disk drive

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PROBLEM TO BE SOLVED : To produce an R-Fe-B-based magnet (R is a rare earth element) in a short time under a good work environment, which has excellent corrosion resistance and high adhesion to an adhesive and which does not cause pollution on the environment. SOLUTION : A method for producing the permanent magnet comprises forming a protective layer on the surface of a permanent magnet containing R (R is a rare earth element), Fe and B, and subjecting the protective layer to plasma treatment. COPYRIGHT : (C)2004, JPO