ELECTROPLATED CONIFE ALLOY FOR USE IN AN INTEGRATED INDUCTIVE MAGNETORESISTIVE RECORDING HEAD

An electrodeposition formula and operating conditions were developed a nd optimized for the high saturation magnetization Co80Ni10Fe10 alloy. The effects of magnetic field application during deposition and in su bsequent process operations was investigated. The bulk film magnetic p erformance was compared to conventional Permalloy. Identical write hea ds, designed for a 300 Mbit/in.2 operating point, were fabricated and tested for a direct comparison of conventional NiFe and CoNiFe. The yo ke thickness of the CoNiFe heads was scaled linearly by the difference in saturation moment. Overwrite performance on high coercivity media demonstrated that the CoNiFe heads performance was equivalent to the t hicker NiFe heads. Heads fabricated with yokes deposited in an orthogo nal switching field, annealed with no applied field, exhibited reduced H(k) in the bulk film measurement and reduced saturation write curren ts. The addition of boron to the alloy reduced coercivity.