| 摘要 |
PURPOSE:To realize improvement of magnetic characteristics, particularly of a characteristic in iron loss, as well as improvement of layer resistance, without danger of causing fragility and decrease in space factor, by forming a ceramic thin film by an evaporation method under an external magnetic field applied in the longitudinal direction of an amorphous alloy thin band having a positive constant of magnetic strain. CONSTITUTION:An amorphous alloy thin band is produced from a molten alloy bath by single rolling method. A quenched thin band of such composition, because of its saturated magnetic strain, can be extended with an external magnetic field applied. And, a SiO2 film is formed on this quenched thin band by ion plating method in depressurized argon gas and under the application of the external magnetic field. Such a film-formed treatment enables magnetic domain to be oriented 180 deg. in parallel with the longitudinal direction of the thin band and the thin band to be expanded in the longitudinal direction. Magnetic characteristics can be improved by forming a ceramic thin film on the surface of the thin band and fixing the thin band, under such a condition. Because the thin band is not heated, there is no danger of causing fragility and crystalization in the amorphous alloy. Besides, because of decrease in stress sensitivity of the amorphous alloy thin band, a superior characteristic in iron loss can be maintained. |
