SOFT MAGNETIC THIN FILM, ITS MANUFACTURING METHOD, VERTICAL MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a soft magnetic thin film which is capable of preferentially strengthening and sharpening a vertical recording magnetic field when applied to a vertical magnetic recording medium, its high-productivity manufacturing method, a high-quality vertical magnetic recording medium improved in magnetization responsiveness in a track running direction, and a vertical magnetic recording and reproducing device comprising the same vertical magnetic recording medium.;SOLUTION: The soft magnetic thin film can be obtained by immersing a substrate in an electroless plating bath which contains Co ion, Fe ion and Ni ion as metal ions and contains a complexing agent and a boron reducing agent and of which the concentration ratios of the metal ions are 0.15≤(Ni ion quantity/total metal ion quantity)≤0.40, 0.50≤(Co ion quantity/total metal ion quantity)≤0.80 and 0.05≤(Fe ion quantity/total metal ion quantity)≤0.15, and by performing electroless plating in a magnetic field within a range of 5 to 2,000 Oe parallel to a substrate surface.;COPYRIGHT: (C)2006,JPO&NCIPI