CoFe電着薄膜の磁気特性

概要

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Films with higher saturation magnetization are desired for improving the recording density of thin film magnetic recording heads. A study has been conducted on the effects of the magnetic properties of organic additives on the plating baths from which cobalt-iron films with a Bs greater than 1.5T were obtained. Film with a coercivity lower than 1 Oe was obtained from a bath containing 0.02mL/L of 2-propyn-1-ol (PPO) and 60g/L of naphthalene-1, 3, 6-trisulfonic trisodiumsalt (NTS). Internal stress decreased with the amount of NTS, and the sulfur content of the film correlated with internal stress and with coercivity.The effects of heat treatment on the soft magnetic properties of the films were also investigated. The anisotropic field Hk can be changed by the repeated heat treatment in a magnetic field directed along the hard axis. Films with a small anisitropy field (Hk<5 Oe) showed high permeability (μ>2000).Under this type of heat treatment, Hk was affected by direction of magnetic fields at three stages: (a) during deposition, (b) during initial heat treatment, and (c) during final heat treatment.
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