ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 23    No. 3    March 2013

Effect of boron/phosphorus-containing additives on electrodeposited CoNiFe soft magnetic thin films
Jian-mei LI1 , Zhao ZHANG2, Jin-feng LI3, Min-zhao XUE1, Yan-gang LIU1
(1. School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
3. School of Materials Science and Engineering, Central South University, Changsha 410083, China
)
Abstract: CoNiFe, CoNiFeB and CoNiFeP soft magnetic thin films were prepared by cyclic voltammetry method. The morphologies, composition and structures were characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectroscope (EDS) and X-ray diffractometer (XRD). The soft magnetic properties were investigated through vibrating sample magnetometer (VSM). The corrosion resistance was investigated through Tafel polarization and electrochemical impedance spectroscopic (EIS). The results show that all the electrodeposited CoNiFe, CoNiFeB and CoNiFeP films are mixtures of crystalline and amorphous phases, and high amount of boron/phosphorus-containing additives favors the formation of amorphous state. Nanostructure is obtained in CoNiFe and CoNiFeB films. The inclusion of boron causes the film more dense and also increases its corrosion resistance. Meanwhile, the inclusion of boron lowers its coercivity (Hc) from 851.48 A/m to 604.79 A/m, but the saturation magnetic flux density (Bs) is almost unchanged. However, the addition of phosphorus greatly increases the film particle size and decreases its corrosion stability. The coercivity (Hc) of CoNiFeP film is also highly increased to 12485.79 A/m, and its saturation magnetic flux density (Bs) is greatly decreased to 1.25 T.
Key words: magnetic materials; thin films; electrodeposition; magnetic properties; corrosion
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)