| 摘要 |
PURPOSE:To increase the magnetic permeability of a thin amorphous magnetic alloy plate even when the alloy composition has high saturation magnetic flux density by keeping the plate at a specified temp. and by alternately impressing magnetic fields to the plate in directions which are perpendicular to each other at equal time intervals to heat treat the plate. CONSTITUTION:A thin amorphous magnetic alloy plate 1 is put in an electric furnace and kept at a temp. below the crystallization temp. of the alloy and below the Curie temp. By supplying electric currents to coils 2, 3 wound around the plate 1 perpendicularly to each other, magnetic fields which meet at right angles are alternately generated to heat treat the plate 1. At this time, electric currents are supplied to the coils 2, 3 in accordance with timing wave-forms 4, 5 shown by the figure. This method is applicable to an amorphous magnetic alloy having a cooling effect in a magnetic field, and high magnetic permeability can be given even to a composition having >=10,000 saturation magnetic flux density. Accordingly, a superior material for the soft magnetic core of a magnetic head, etc. can be provided. |
