Title :
Magnetic Properties and Microstructure of FePt(MoC, C) Granular Films
Author :
Tsai, J.L. ; Tseng, Y.T. ; Li, C.R. ; Fu, S.C. ; Hu, K.C. ; Tzeng, J.L.
Author_Institution :
Dept. of Mater. Sci. & Eng., Nat. Chung Hsing Univ., Taichung, Taiwan
Abstract :
The FePt-Mo40C60(x vol%)/MoC/CrRu (x = 0, 7, 10, 15, 20, and 25) films were deposited on glass substrates by magnetron sputtering. The Mo40C60 target was used as material of intermediate layer and segregant and formed the MoC and C two phases after deposition. The MoC(200) intermediate layer was epitaxially grown on the (200) textured CrRu seed layer at 425 °C. The FePt-MoC film was cosputtered on (200) textured MoC at 425 °C and showed the strong (001) texture. The out-of-plane coercivity of FePt-MoC(7 vol%) film was changed to 7.8 kOe compared with that of a 10-nm thick FePt film. When MoC was added more than 10 vol%, the ordering degree and perpendicular magnetic anisotropy were degraded. The out-of-plane coercivity decreased and in-plane loops open up. For microstructure, the FePt grains were separated by (MoC and C) and formed the granular structure. From cross-sectional images, the FePt-MoC(7 vol%) film was island like and changed to continuous layer in a FePt-MoC(15 and 25 vol%) film.
Keywords :
chromium alloys; coercive force; granular materials; granular structure; iron alloys; magnetic epitaxial layers; molybdenum compounds; perpendicular magnetic anisotropy; platinum alloys; ruthenium alloys; segregation; sputter deposition; vapour phase epitaxial growth; (001) texture; (200) textured CrRu seed layer; (200) textured MoC; FePt-Mo40C60-MoC-CrRu; MoC(200) intermediate layer; SiO2; cross-sectional images; epitaxial growth; granular films; granular structure; in-plane loops; island-like films; magnetic properties; microstructure; out-of-plane coercivity; perpendicular magnetic anisotropy; segregant; size 10 nm; temperature 425 degC; Coercive force; Films; Microstructure; Morphology; Perpendicular magnetic anisotropy; Substrates; Surface morphology; Granular structure; granular structure; perpendicular magnetic anisotropy; texture;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2435811
