Study Of Perpendicular Magnetic Recording Media

Hard disk driver storage technology is one of the most important technologies for information processing.The main storage ways contain magnetic recording technology,optical storage and flash now.Magnetic recording ways undergo the transition from longitudinal to perpendicular. Magnetization is parallel and normal to medium.To overcome superparamagetism limitation,we must exploit new perpendicular magnetic film.Around of perpendicular magnetic recording medium,the thesis has a study about preparation and physical property of L1₀ phase FePt film and TbFeCo film.In addition,I try to use ready perpendicular magnetic film to magnetic photon crystal.The thesis is divided into three parts.We report on improving(001) texture and thus perpendicular anisotropy in FePt films through oblique sputtering of NiO buffer layer.The effects can be attributed to an improvement of(200) preferential orientation in the obliquely deposited NiO films as compared to the random orientations in the film fabricated by normal sputtering.On top of this NiO layer, Ag layer with(200) preferred orientation is stabilized,which further stimulates reducement of ordering temperature and(001) texture of the FePt layer.Our study also shows that the structures and perpendicular anisotropy also depend critically on the film thickness and composition of FePt alloy,and growth temperature.In order to reduce medium noise and keep high perpendicular anisotropy at the same time.Both TbFeCo and TbFeCo-SiO₂ films were prepared by magnetron sputtering.At film thickness smaller than 75 nm,TbFeCo-SiO₂ films have coercivity and perpendicular magnetic anisotropy larger than those of TbFeCo films and vice versa at film thickness larger than 75 nm. This phenomenon can be attributed to enhancement in the degree of preferred orientation of TbFeCo grains.For these two series of samples, the magnetization reversal process is accompanied by the combination of the pinned domain wall motion and domain rotation.The weak pinning of domain wall motion cannot be excluded.We have studied the magneto-optical Kerr effect and optical reflectance of perpendicular magnetized Co/Pt films on self-assembly two-dimensional polystyrene spheres.It is shown that the magneto-optical and the reflectance spectra are correlated to each other.Calculations have shown that the magneto-optical Kerr rotation and the Kerr ellipticity spectra are governed by the resonant coupling of light to the excitations of surface Plasmon polaritons and modified by the sphere diameters.These effects lead to the possibility of developing new magnetoplasmonic nanosensors.