A comparative study between bulk and r.f. sputtered thin films of boron doped NiMnGa

2^nd International Conference and Exhibition on Materials Science & Engineering

October 07-09, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

B. Rajini Kanth

Accepted Abstracts: J Material Sci

Abstract :

Study of ferromagnetic shape memory alloys is of interest, because of their smart behaviour and these can be good candidates for the sensors and actuators applications. NiMnGa is considered a prototype of these materials, but being brittle practically using it is difficult. We have doped boron because it stabilizes the martensite also to enhance its ductility and studied their magnetic and transport properties. The thin film samples were deposited at a constant r. f. power of 60 W for 60 min duration, on glass substrates kept at room temperature at different partial pressures 0.06, 0.01, 0.2 mb. The films were subsequently annealed at 773 K for 30 min and were characterized by using the X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) and magnetization measurements. From the room temperature, XRD and SEM, EDAX of the thin films, the structure and composition of these samples were found to be preparation conditions dependant. From the SEM photographs, the thin films were found to be possessing fine grained microstructure on the glass and, grains were large in size at 0.06 mb partial pressure. The structural and magnetic transformation temperatures were determined using the magnetic and transport measurements for both bulk and thin film samples and the properties were compared. The results on such studies were presented in this paper.

Biography :

B. Rajini Kanth has completed his Ph.D. at the age of 30 years from Osmania University and post-doctoral studies from S. N. Bose National Center for Basic Sciences, Salt Lake, Kolkata, India from the Department of Condensed Matter Physics from 2007 to 2011. Presently, he is working as the Dean R&D, Department of Science and Humanites, T. K. R. College of Engineering and Technology, Hyderabad, India, a premier Engineering and Technological Institute. Recently, the Department of Science and Technology, New Delhi, India has sanctioned a research project under the Young Scientist Scheme. He has published more than 16 research papers in reputed journals and is a life member of Magnetics Society of India, Kanchan Bagh, Hyderabad.