The Ag effect on magnetic properties and microstructure of FePt/Ag2Te particulate films

FePt Thin Films – Prospective Materials for Ultrahigh Density Magnetic Recording

“…It has been shown in [27] that a significant decrease of grain size as well as their isolation and the decrease of exchange interaction level between them occurs in [FePt(1 nm)/Ag 2 Te(0,1-0,4 nm)] 10 thin films with respect to the thin film composition without additional Ag 2 Te layers.…”

“…Other additional bottom layers have been used in order to decrease the ordering temperature. It has been shown that Bi bottom layer facilitates the decrease of the ordering temperature due to introduction of Bi atoms into FePt layer and redistribution of Fe and Pt atoms [27]. Low temperature ordering has been achieved through formation of various silicides by deposition of additional Cu layer on a single crystal substrate Si(001) [28].…”

Perpendicular Magnetization Behavior of Low- Temperature Ordered FePt Films with Insertion of Ag Nanolayers

“…The method of Fe/Pt multilayer growth also used in this work can effectively lower the ordering temperature of martensite-based phase transformation from face-centered-cubic (fcc-disordered) to face-centered-tetragonal (fct-ordered) state due to the faster Pt and Fe atoms to interdiffuse at the Fe/Pt interface to form a chemically L 1 0 -FePt compound phase [ 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. FePt alloy films added with Ag-top, Ag-under, and Ag-doped methods have been reported not only to improve the ordering phase transformation, but have also been employed as the seed of promoting the (001) preferred crystallographic orientation of FePt films [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. The Ag element was also used to serve as a matrix phase to separate FePt grains due to immiscible Ag atoms from the FePt alloy.…”

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].…”