With the progress in the field of magnetic MEMS technologies there has been growing interest in developing electroplated, nano-structured hard-magnetic materials for microactuators, micromotors, microswitches etc. Recently, we reported the design & simulation of different electromagnetic power generators using CoPt/CoPtP micro-magnets. The Co-rich CoPtP films were galvanostatically deposited using the sulfamate bath. These films showed Co HCP phase and grain size(~20nm) and larger coercivity of over 1500Oe. The use of optimized pulse reverse (PR) plating parameters with addition of stress relieving additives was able to produce a thick (~50 microns), stress-free and nanostructured CoPtP films with improved magnetic properties.

SEM image of DC plated film at 20 mA/cm 2 for 1 hr SEM image of PR plated film at 20 mA/cm 2 for 1 hr ( grain size 20 nm)
Stress free, nanostructured Co-rich CoPtP super-hard magnetic film for MEMS application

Project:

Project: [1]‘Vibrational Energy Scavenging(VIBES)’ in collaboration with University of Southampton, UK and other EU partners - funded in EU 6th FW IST-STREP - (started from Jan 04) Two Ph.D. students are guided within this project.

Selected Publications

[1] S. Kulkarni, S.Roy , T, O’Donnell, S.Beeby, J. Tudor , 50th Magnetism and Magnetic Materials Conference 2005, California, Nov 2005
[2] S. Kulkarni , S.Roy, T, O’Donnell, S.Beeby, J. Tudor , “ Vibration based electromagnetic power generator on Si” Journal of Applied Physics, Issue 8, Vol 99, 08P511 (2006)
[3] S. Kulkarni, Saibal Roy, Terence O’Donnell, Steve Beeby, John Tudor , INTERMAG – 06 conference, 8-12 May, San Diego, California, US (2006)
[4] S P Beeby, M J Tudor, R N Torah, P Glynne-Jones, T O’Donnell, C R Saha and S Roy; Micro electromagnetic generator for vibration energy harvesting; Journal of Micromechanics and Mcroengineering, 17, 1257-1265, 2007
[5] S. Kulkarni, S. Roy, “Development of nano-structured, stress-free Co-rich CoPtP films for magnetic MEMS applications” Journal of Applied Physics, 101, 09K524, (2007)

Contact: Dr. Saibal Roy, Email: saibal.roy@tyndall.ie | webpage