Title :
Magnetic Properties and Microstructure of Exchange Coupled (FePt-Fe)/(Ag-FePt) Films
Author :
Tsai, J.L. ; Liu, B.F. ; Tzeng, H.T. ; Tai, H.W. ; Wang, J.M.
Author_Institution :
Dept. of Mater. Sci. & Eng., Nat. Chung Hsing Univ., Taichung, Taiwan
fDate :
3/1/2011 12:00:00 AM
Abstract :
A soft/hard chemically disordered/ordered (FePt-Fe)/(Ag-FePt) films was prepared on a glass substrate. The (FePt-Fe)/(Ag-FePt) film was exchange coupled and annealed (FePt-Fe)/(Ag-FePt) film again from 200 to 700 for 1 min allowed modification of the interface from sharp to rough and finally into graded. The (FePt-Fe)/(Ag-FePt) films annealed from 200-600 show two-steps out-of-plane magnetization curves. The magnetization of disordered FePt-Fe reversed first and followed by the ordered Ag-FePt film. When the film annealed at 700, the out-of-plane magnetic hysteresis loops show perpendicular anisotropy with rigid magnetization which was due to the nanoscale interface exchange coupling. The magnetization was reversed at a single switching field and interpreted by the two-spin model. The exchange coupled composite film with perpendicular magnetization can be performed in the chemically disordered/ordered FePt system.
Keywords :
composite materials; exchange interactions (electron); interface magnetism; interface roughness; iron; iron alloys; magnetic anisotropy; magnetic annealing; magnetic hysteresis; magnetic thin films; magnetisation reversal; platinum alloys; silver; silver alloys; (FePt-Fe)-(Ag-FePt); SiO2; annealing; glass substrate; magnetic hysteresis loops; magnetic properties; microstructure; nanoscale interface exchange coupling; out-of-plane magnetization curves; perpendicular anisotropy; rough interface; soft-hard chemically disordered-ordered films; temperature 200 degC to 700 degC; time 1 min; Chemical disordered/ordered; exchange coupled; perpendicular anisotropy;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2010.2102342
