Light rare earth-heavy rare earth-transition metal films (LRE-HRE-TM)have large saturation magnetization (M<sub>s</sub>) and are
the promising media for hybrid recording. In this paper, Nd(Tb,Dy)Co/Cr films with perpendicular magnetic anisotropy
were successfully fabricated onto glass substrate by RF magnetron sputtering and the effects of sputtering technology
parameters and Nd substitution for HRE atoms on the magnetic properties were investigated. It was found that when the
sputtering power and sputtering time are 250W and 4min, respectively, the magnetic properties of Nd(Tb,Dy)Co/Cr
films obtain optimization, perpendicular coercivity, Ms and remanence square ratio(S) of NdTbCo/Cr film reach 3.8kOe,
247emu/cm<sup>3</sup> and 0.801, respectively. With the increasing of Nd concentration, Ms increases, while the coercivity (H<sub>c</sub>)and
the temperature stability of magnetic properties decrease distinctly. These results can be explained by the ferri-magnetic
structure of the RE-TM alloy.
The FePt single layer films with different thickness were deposited by RF magnetron sputtering on glass and Corning glass substrates, and the L10-FePt films were obtained after the as-deposited samples were subjected to vacuum annealing using different cooling processes. It costs 7 hours for the temperature to decrease from 550 to the room temperature during the natural cooling process, however it just costs 1.5 hours during the fast cooling process.Results show that after annealed at for 1h, the perpendicular coercivity of the FePt single layer films decreases with the increasing of FePt layer thickness, and the FePt 15nm film exhibits a high perpendicular coercivity of 8308 Oe and a low in-plane coercivity of 5141 Oe, which suggests that the film exhibits a high perpendicular anisotropy. The FePt films with nature cooling can obtain larger Mr/Ms values than that with fast cooling.
Pt and Ag underlayers with rough surface structure have been prepared onto glass slides by rf magnetron sputtering and
the effects of rough underlayers on the magnetic properties of TbFeCo films have been investigated. It was found that
rough Pt or Ag underalyers will increase the coercivity, the saturation magnetization and the Kerr rotation angle,
enhance the temperature dependence of magneto-optical characteristics. These results can be explained with the pinning
effects introduced by rough interfaces and the decrease of the exchange interaction between Tb atom and transition metal
atom. A saturation magnetization of 125emu/cm<sup>3</sup> and a coercivity of 8.6kOe of Tb<sub>21</sub>Fe<sub>69</sub>Co<sub>10</sub>/Pt at room temperature
could be obtained, doping of the LRE elements such as Sm and Nd could increase the Ms of TbFeCo films with rough
underlayers. These films become a candidate for high -density hybrid recording media.
The (Sm,Nd)(Tb,Dy)Co thin Film had been prepared with spf-430H r.f.-magnetron sputtering system. The effects of heavy rare earth Tb, Dy substituted by light rare earth Sm, Nd on the magnetic and magneto-optical properties have been investigated. With the increasing of light rare earth Sm, Nd composition, the saturation magnetization Ms, the reflectivity R and the Kerr rotation angle θ<sub>k</sub> are increased, while the coercivity (Hc) is decreased distinctly. This can be explained with the ferri-magnetic structure of RE-TM alloy. Mr/Hc Ratio is increased with the increasing of Sm composition in
SmTbCo and SmDyCo. The influence of composition and sputtering conditions on perpendicular anisotropy films are reported in detail.