PK Kulryia (IUAC New Delhi, India)
Vendredi 20 Mai 2011 à 16h
Magnetic nanoparticle dispersed in the matrix such as carbon, silica, aluminum oxide or immiscible metal matrix is important for various studies because of their potential application in ultra-high density magnetic recording media and high resistance magnetic materials etc. Recently, ferromagnetism has been observed in nanoparticles of metals such as Pd, Pt, Au, and Ag which are nonmagnetic in bulk. Palladium is very interesting due to its high magnetic susceptibility and higher Curie temperature as compared to other noble metals. Palladium nanoparticles ( 4 nm size) have been synthesized by sputtering. They exhibit ferromagnetic behavior. This ferromagnetic signal is increased by twenty times on ion irradiation. The enhancement in the magnetism is explained on the basis of the defects induced modification of Pd electronic structure. In the present talk, the structural and magnetic properties of Pd nanoparticle embedded in the carbon films and effect of swift heavy ion irradiation on them, will be discussed.