Abstract
The dependence of the degree of order and perpendicular magnetic anisotropy (Ku⊥) on magnetic layer thickness (dmag) for FePt granular films with various grain boundary materials (GBMs) were investigated. According to the analysis for granular films with a constant GBM volume of 30 vol%, the order, disorder, and non-epitaxial portions co-existed in the FePt granular films. From the separate quantitative evaluation for these portions, the following was found; 1) the degree of order and magnitudes of Ku⊥ for disorder and order portions against dmag were constant, while the film average evaluation resulted in the dependence of the degree of order and Ku⊥ on dmag and the positive correlation between the grain diameter and the degree of order, 2) for the order portion, Ku⊥ had linear correlation with the degree of order, 3) the magnitude of Ku⊥ and the degree of order for the order portion depended on GBM.
Highlights
L10 FePt-based granular media with grain boundary material (GBM) which have high perpendicular magnetic anisotropy (Ku ) at room temperature is a promising candidate for the next-generation technology heat-assisted magnetic recording (HAMR)
The separate evaluation considering the inhomogeneity is indispensable in order to understand a real material nature for development of FePt granular media
The order, disorder, and non-epitaxial portions co-existed in the FePt granular films
Summary
L10 FePt-based granular media with grain boundary material (GBM) which have high perpendicular magnetic anisotropy (Ku ) at room temperature is a promising candidate for the next-generation technology heat-assisted magnetic recording (HAMR). In pure FePt films or FePt-C granular films, the structural inhomogeneity due to Pt segregation on a FePt grain surface, random crystalline orientation of grains, L12 phase in a grain, and twin have been reported. In pure FePt films or FePt-C granular films, the structural inhomogeneity due to Pt segregation on a FePt grain surface, random crystalline orientation of grains, L12 phase in a grain, and twin have been reported. The effect of the inhomogeneity on the degree of order and Ku has not attracted significant attention. An effect of GBM on the inhomogeneity of FePt granular films has not been clarified yet, while there has been several reports on degree of order and/or Ku for FePt granular films with various GBMs (C, GeO2, SiOx, TiO2, C-Ag, TaOx, and B).. In order to analyze degree of order and Ku by taking into account of the inhomogeneity along the film thickness, the evaluation of thickness dependence of structure and perpendicular torque curve for FePt granular films with various GBMs was carried out An effect of GBM on the inhomogeneity of FePt granular films has not been clarified yet, while there has been several reports on degree of order and/or Ku for FePt granular films with various GBMs (C, GeO2, SiOx, TiO2, C-Ag, TaOx, and B). in order to analyze degree of order and Ku by taking into account of the inhomogeneity along the film thickness, the evaluation of thickness dependence of structure and perpendicular torque curve for FePt granular films with various GBMs was carried out
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