No.6（2003）9.Microstructure and magnetic properties of Ni-W alloy films formed using electrodeposition

Kiyoshi ITOH, Feng WANG and Tohru WATANABE

The electrodeposited Ni-W alloy films were obtained from Nickel Sulfate baths containing Na2WO4. The crystallographic structure and magnetic properties of electrodeposited Ni-W alloy films were studied by using XRD, SEM and Vibrating Sample Magnetometer.

The X-ray diffraction patterns of Ni-W alloy films with various W contents gradually changed from sharp peaks to broad peaks with increasing W contents in electrodeposited films.

HRTEM observation revealed that the crystallographic structure of electrodeposited Ni-W alloy film with 24.4at%W content was crystalline and its crystal size was about 5nm. Otherwise, there was no crystalline structure of Ni-W alloy film with 27.7at%W content.

Therefore, it can be concluded that the microcrystalline phase existed up to 26at%W in electrodeposited Ni-W alloy film and the amorphous phase existed from 26at%W to 35at%W.

Films at low W contents had magnetic properties and films at high W contents had no magnetic properties.

Keywords
Nickel-Tungsten, Electrodeposition, Amorphous, Microstructure, Magnetism

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