Kunio Mizushima

CO-P ELECTRODEPOSITED ALUMITE FILMS WITH IN-PLANE MAGNETIZATION

The magnetic properties and corrosion resistance of a magnetic alumite film, in which micropores are filled with Co, are investigated. It is found that in-plane magnetizatlon film is obtained by adding a small amount of P to the Co. For example, the effective anisotropy energy of the film changes from +0.44×105 erg/cm3 to -1.32×105 erg/cm3 by the addition of 8 at.% P. The in-plane coercivity of the film can be controlled between 340 Oe and 1350 Oe by the P content. The corrosion resistance of the film filled with Co94P6 under the atmosphere of 40°C, 90% R. H. with 10 ppm SO2 gas is tested. The corrosion resistance of the film under this condition is superior to that of sputtered Co-Ni thin film media with a carbon protective layer. Magnetic alumite film filled with Co-P alloy is considered to be a candidate for longitudinal magnetic recording media.

Recording characteristics of high density metal powder floppy disks

Abstract A combination of metal powder coated medium and metal-in-gap head provides sufficient read/write characteristics to develop 5.25 inch, 10 Mbyte floppy disk systems, in which a 40 k fci-127 tpi format is adoped. This has been achieved mainly by the optimization of medium coercivity, and of head gap length as well as surface smoothing to less than 12 nm in RA.

Brillouin scattering in Fe-polyethylene co-evaporated films

Abstract Spin waves in soft ferromagnetic Fe-polyethylene co-evaporated films have been studied in Brillouin scattering. Scattering from the standing spin waves and the Damon-Eshbach surface wave has been observed. The magnetic constants of the films are discussed.