Title :
Magnetic properties and nanostructures of composite CoxPt100-x:C thin films
Author :
Yan, M.L. ; Liu, Y. ; Yu, M.J. ; Liou, S.H. ; Sellmyer, D.J.
Author_Institution :
Dept. of Phys., Nebraska Univ., Lincoln, NE, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
Nanocomposite CoxPt100-x:C thin films with x=57 and x=50 were prepared by magnetron sputtering. Structures and activation volumes were studied systematically in order to better understand the magnetic behavior. We found that activation volumes of these two samples were almost the same. However, physical grain sizes of these two samples were different. Magnetic grains in the sample with equiatomic Co and Pt composition were almost independently switched and magnetic grains in the sample with higher Co content were exchange coupled and switched together. The reduction of the physical grain size in the sample does not always cause the reduction of the exchange coupling in the sample. Our results indicate that the Co concentration is an additional factor to be used for controlling the properties of nanocomposite CoPt:C films
Keywords :
carbon; cobalt alloys; composite materials; exchange interactions (electron); grain size; magnetic recording; magnetic thin films; nanostructured materials; platinum alloys; sputtered coatings; thermal stability; CoPt:C; activation volumes; composite CoxPt100-x:C thin films; exchange coupled; grain sizes; independently switched; magnetic behavior; magnetic grains; magnetic properties; magnetron sputtering; nanocomposite; nanostructures; Grain size; Magnetic anisotropy; Magnetic films; Magnetic properties; Magnetic recording; Magnetic switching; Nanostructures; Perpendicular magnetic anisotropy; Sputtering; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
