| 摘要 |
PURPOSE:To prevent an Fe-Ni metallic magnetic film from exfoliating during a heat treatment, by employing as a substrate a non-magnetic material represented by the formula, ZnxMn2-xNiO3 (0<=x<=1). CONSTITUTION:ZnO, MnO and NiO are weighed, mixed together and ground in water and then calcinated at 700-1,200 deg.C before being formed by means of a mold. Then, the mixture is sintered at 1,150-1,300 deg.C in N2 to prepare a material represented by the formura, ZnxMn2-xNiO3 (0<=x<=1). This material has the NaCl structure. The material is mirror-finished and provided with an Fe-Ni metallic magnetic film by sputtering and then annealed. The substrate formed in accordance with this constitution is equal in thermal expansion coefficient to the Fe-Ni metallic magnetic film; therefore, any desired annealing can be effected without any possibility of exfoliation. In addition, since the substrate has a hardness substantially equal to that of the magnetic powder in a magnetic tape, it is made possible to construct an excellent thin film magnetic head. |
