Loading patent…
AssigneeFuji Photo Film Co., Ltd.
InventorsKanji Nakanishi, Osamu Shimizu, Satoshi Yoshida, Masaaki Katayama, Tatsuya Isomura
Estimating the term…
A soft magnetic thin micro-crystalline film of FeaTbNc (at %) wherein T is at least one of Zr, Hf, Ti, Nb, Ta, V, Mo, and W and 0<b≦20, and 0<c≦22 except the range of b≦7.5 and c≦5, shows low coercivity Hc of 80-400 Am−1 (1-5 Oe) which is stable upon heating at elevated temperatures for glass bonding. This film is produced by crystallizing an amorphous alloy film of the similar composition at 350-650° C. to a crystal grain size up to 30 nm to provide uniaxial anisotropy and increased magnetic permeability at a higher frequency. It can also provide low magnetostriction around λs=0. A composite magnetic head is made using this thin film. A diffusion preventive SiO2 layer is disposed between ferrite cores, and this thin film in the magnetic head prevents an interdiffusion layer and suppresses beat in the output signal.
A soft magnetic thin film comprised of a single-layer structure of a substantially uniform composition represented by the compositional formula Fea-mMmTbNc, wherein a, b, c and m are atomic percent, M stands for at least one selected from the group consisting of Co, Ru and Cr, and T stands for at least one selected from the group consisting of Zr, Hf, Ti, Mo, and W, and wherein 0<m/a<0.1, 0<b≦20 and 0<c≦22 with the exclusion of the range wherein both b≦7.5 and c≦5, said soft magnetic thin film exhibiting a coercivity Hc of 400 Am−1 (5 Oe) or less, having a crystallographic orientation that is predominantly α Fe(110) and having a saturation magnetostriction constant λs in the range from 1.6×10−6 to 0 in an absolute value.
A soft magnetic thin film comprised of a single-layer structure of a substantially uniform composition represented by the compositional formula Fea-mMmTbNc, wherein a, b, c and m are atomic percent, M stands for at least one selected from the group consisting of Co, Ru, Cr, V, Ni, Mn, Pd, Ir and Pt, and T stands for at least one selected from the group consisting of Zr, Hf, Ti, Mo and W, and wherein O<m/a<0.3, 0<b≦20 and 0<c≦22 with the exclusion of the range wherein both b≦7.5 and c≦5, said soft magnetic thin film exhibiting a coercivity Hc of 400 Am−1 (5 Oe) or less, having a crystallographic orientation that is predominantly α Fe(110) and having a saturation magnetostriction constant λs in the range 1.6×10−6 to 0 in an absolute value, provided that in the case where V is selected as M, one of b and c is in the range O<b<0.5 and 0<c<0.5, respectively.
Dependencies are inferred from the claim text.