Composition and film thickness effects on microstructure and magnetic properties of ordered L10-structured Fe100−xPtx films

Effects of annealing temperature, atomic composition, film thickness on structure and magnetic properties of CoPt composite films

“…[39], and higher than that of the nanoparticles reported by other researchers [40,41]. The differences of H C between nanoparticles and films can be ascribed to the different kinetic and thermodynamic behavior of the ordering process [1,7,14,[42][43][44][45]. Since the coercivity is closely related to the magnetocrystalline anisotropy of an individual grain [25], the different Co compositions will result in different magnetocrystalline anisotropies and H C .…”

“…The results can satisfactorily explain the increase in H C with thickness. In addition, both the order parameter and the fault spacing increase with increasing film thickness, which may be responsible for the increment of H C [14,35]. Fig.…”

“…The associated hard magnetic ordered L1 0 face-centered-tetragonal (FCT) phase can be obtained by annealing at moderately high temperature and the high magnetic anisotropy strongly correlates with the long-range order parameter of the L1 0 structure [1,3,6,[13][14][15]. However, when the growth temperature increases, the considerable particle coalescence leads to the increased switching volumes, which defeats the point of making small particles [16].…”

Dependence of magnetic properties on the film thickness and Pt atomic fraction of post-annealed Fe1−xPtx-C granular films on MgO(100) and SiO2/Si(100) substrates

“…For obtaining high area densities of 1 Tbit/in 2 , the CoCrPt based perpendicular magnetic recording media are unable to be the medium because the magnetocrystalline anisotropy of the CoCrPt alloy is not large enough. The face-centered tetragonal (fct) FePt alloy with a short c axis has a large saturation magnetization of 1100 emu/cm 3 and a high magnetocrystalline anisotropy of 7.0 × 10 7 erg/cm 3 due to the atomic arrangement with alternating Fe and Pt layers along the c axis [1][2][3][4][5][6][7]. Therefore, the fct FePt alloy becomes the potential candidate of the high density perpendicular magnetic recording media.…”

“…ordered fct structure [8][9][10][11]. Recently, the nonmagnetic matrixes including C, SiO 2 , TiO 2 , Ta 2 O 5 and SiN x have been used to isolate the FePt grains for decreasing the signal-to-noise ratio [12][13][14][15][16]. The metal elements such as Cr, Cu, Ru and Ag were added in the FePt alloy to improve the phase transition and the ordering of the fct phase [17][18][19][20].…”