Abstract
The magnetic properties of electroplated CoNiFe films were investigated. Anomalous codeposition (suppression of Ni deposition) was observed in the CoNiFe electroplating process. Co74Ni17Fe9 films showed high saturation magnetization (1.8 T), low coercivity (< 1.0 Oe), and low magnetostriction (+4 × 10-6). The coercivity of CoNiFe films was decreased by addition of trimethylamine-borane (TMAB) to the bath, because this decreased their grain size. Co74Ni21Fe5 films with lower magnetostriction (+1 × 10-6) and low coercivity (< 1.0 Oe) were obtained by addition of TMAB to the bath. The resistivity and coercivity was unchanged after annealing at 300°C. The corrosion rates of CoNiFe films and TMAB-CoNiFe in a saturated NaCl solution were also investigated.
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