| 摘要 |
PURPOSE:To obtain a magnetic core superior in magnetic characteristics in mass production, by performing heat treatment of a magnetic core comprising an amorphous alloy thin and then performing cooling in a magnetic field below a Curie point in the later cooling process. CONSTITUTION:Heat treatment of a magnetic core comprising a cobalt-group amorphous alloy thin band is performed, and then cooling in a magnetic field is performed below a Curie point in the later cooling process, so that the magnetic core is obtained. The heat treatment of the magnetic core is preferably performed above a Curie point and below crystalization temperature, and the preferable cooling speed in the cooling process is 5 deg.C/min or less. Since the cooling is performed in a part of the cooling process after heat treatment while the magnetic field is applied, the treatment can be done with a few processes, reducing thermal stress on the magnetic core. Besides, since the cooling process is performed slowly, thermal contraction does not rapidly occur to the magnetic core, having few effects on amorphous alloy which is sensitive to strain, not causing deterioration in the magnetic characteristics.
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