Microstructure and magnetic properties of Ag/FePt double layer films with different cooling processes

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

“…Considerable attention has recently been given to L1 0 structured CoPt and FePt films [1][2][3][4][5][6] and their nanoparticles [7,8] because of their potential applications in future ultrahigh-density magneticstorage media. Due to the large surface/volume ratio, nanoparticles oxidize easily in air and form oxides that tend to be typically antiferromagnetic [9].…”

“…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]. A significant reduction of the ordering temperature can be achieved by doping Sn, Pb, Sb, Bi, Ge or Ag into the sputtered films [2][3][4][5][6], but the doping process is not well controlled and the doping will increase the probability of the impurities appearance, which makes the material unsuitable for the practical applications. Therefore, some researchers attempt to improve its magnetic properties by adjusting the ratio of Co and Pt composition [17,18].…”

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

“…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]. Meanwhile, multiple laser pulsing and ultrafast heating were used to make the phase transition into the ordered fct FePt phase [21,22].…”

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

“…The third element doped into the FePt films makes the transformation temperature decrease because of the increase of the diffusivities of Fe and Pt atoms [9,10]. Furthermore, top layers or sublayers including Ag, Pt and GePt can also affect the microstructure and magnetic properties of the FePt layers [11][12][13][14]. It is well known that the composition and film thickness of the nanoscale films affects the structure and properties of the films intensively.…”