CoNiFe電析膜の磁気特性  [in Japanese] Magnetic Properties of CoNiFe Electroplated Films  [in Japanese]

The magnetic properties of electroplated CoNiFe films were investigated. Anomalous codeposition (suppression of Ni deposition) was oBserved in the CoNiFe electroplating process. Co_<74>Ni_<17>Fe_9 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. Co_<74>Ni_<21>Fe_5 films with olwer 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℃. The corrosion rates of CoNiFe films and TMAB-CoNiFe in a saturated NaCl solusiton were also investigated.