Title :
Magnetic property enhancement of Fe49-xCoxPt51 (x=0.0,0.7,1.3,2.2) thin films
Author :
Chen, S.K. ; Hsiao, S.N. ; Yuan, F.T. ; Chang, W.C.
Abstract :
Magnetic properties of Fe49-xCoxPt51 (x=0.0,0.7,1.3, and 2.2) thin films are investigated. Cobalt is found to enhance the magnetization and energy product of the films. A maximum energy product of 18.4 MGOe is obtained at x=1.3. This value is 87% larger than that of a binary FePt film. High-saturation magnetization of Ms=1180 emu/cm3 and remanent magnetization of Mr=862emu/cm3 are obtained as the sample with x=1.3 was annealed at 500°C. The addition of cobalt increases the ordering temperature of the film, which retains more disordered phase in the film and thus produces higher magnetization than the binary sample. Exchange coupling is found to exist between ordered and disordered FePt phases. The intensive intergranular exchange coupling also makes the switching of magnetic moments in the thin film more cooperative. We consider that both the magnetization enhancement and the cooperated switching behavior in the thin film are responsible for the increased energy product.
Keywords :
cobalt alloys; coercive force; magnetic moments; magnetic switching; magnetic thin films; FeCoPt; FePt film; cobalt; disordered phase; energy product; film ordering temperature; intergranular exchange coupling; magnetic moments switching; magnetic property enhancement; magnetic thin films; magnetization; permanent magnets; Annealing; Cobalt; Couplings; Iron; Magnetic films; Magnetic moments; Magnetic properties; Magnetic switching; Magnetization; Temperature; Coercive squareness ratio; Fe–Pt–Co; energy product; exchange coupling; permanent magnets; thin films;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854694