Microstructure and Magnetic Properties of Electrodeposited Cobalt Film

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Journal of Materials Science

DOI:https://doi.org/10.1007/s10853-007-2383-2· OSTI ID:968599

Bhuiyan, Md S ^[1]; Taylor, B. J. ^[2]; Paranthaman, Mariappan Parans ^[1]; Thompson, James R ^[1]; Sinclair, J. ^[3]

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1. ORNL
2. Tennessee Technological University
3. University of Tennessee, Knoxville (UTK)

Cobalt films were electrodeposited onto both iron and copper substrates from an aqueous solution containing a mixture of cobalt sulfate, boric acid, sodium citrate, and vanadyl sulfate. The structural, intermetallic diffusion and magnetic properties of the electrodeposited films were studied. Cobalt electrodeposition was carried out in a passively divided cell aided by addition of vanadyl sulfate to keep the counter electrode clean. The divided electrolytic cell with very negative current densities cause the electrodeposited Co to adopt a face-centered cubic (fcc) structure, which is more magnetically reversible than the hexagonally close-packed (hcp) structured Co. The coercive field is also significantly less in the fcc-electrodeposited cobalt than in the hcp. SEM images show dense, uniform Co films without any cracks or porosity. Beside the deposition current, thickness of the film was also found to affect the crystal orientation particularly on iron substrates. Diffusion of cobalt film into the iron substrate was studied under reduced environment and a fast process was observed.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Temperature Materials Laboratory; Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 968599
• Journal Information: Journal of Materials Science, Journal Name: Journal of Materials Science Journal Issue: 5 Vol. 43; ISSN JMTSAS; ISSN 0022-2461
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT
CRYSTAL STRUCTURE
ELECTRODEPOSITED COATINGS
MAGNETIC PROPERTIES
MICROSTRUCTURE
SUBSTRATES