Journal Article Investigation of coercivity for electroplated Fe-Ni thick films

Yanai, T.  ,  Eguchi, K.  ,  Koda, K.  ,  Kaji, J.  ,  Aramaki, H.  ,  Takashima, K.  ,  Nakano, M.  ,  Fukunaga, H.

8 ( 5 )  , p.056123 , 2018-05-01 , American Institute of Physics
We have already reported Fe-Ni firms with good soft magnetic properties prepared by using an electroplating method. In our previous studies, we prepared the Fe-Ni films from citric-acid-based baths (CA-baths) and ammonium-chloride-based ones (AC-baths), and confirmed that the coercivity for the AC-baths was lower than that for the CA-baths. In the present study, we investigated reasons for the lower coercivity for the AC-baths to further improve the soft magnetic properties. From an observation of magnetic domains of the Fe22Ni78 films, we found that Fe22Ni78 film for AC-bath had a magnetic anisotropy in the width direction, and also found that the coercivity in the width direction was lower than the longitudinal one for the AC-bath. As an annealing for a stress relaxation in the films reduced the difference in the coercivity, we considered that the anisotropy is attributed to the magneto-elastic effect.

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