| 摘要 |
PURPOSE:To prevent the damage of a magnetic gap under working by bonding an FeAl thin film which is formed on at least one of set of core blocks by hot press. CONSTITUTION:The flat surfaces 28 and 29 to be butted against each other excluding the part corresponding to SiO2 films 27 and 27 and a window groove 24 of half-body core blocks 20 and 21, for example, are mirror-lapped. An alloy 30 contg. 16% Al and 84% Fe is then deposited by sputtering on the flat surface 29 to be butted in about 2,000-3,000Angstrom film thickness. Then the half-body core blocks 20 and 21 are clamped by pressing plates 31 and 32, pressed on each other with a force of about 0.5kgf/cm<2>, allowed to stand in an atmosphere at 10<-6> torr vacuum, at about 800-1,000 deg.C, and for 20-40min, and bonded to each other. Consequently, the bonding of the core blocks is extremely strengthened, a back gap is eliminated, the damage of a magnetic gap during production is prevented, and the deterioration of the magnetic characteristic is prevented.
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