Addition of Ru to L1(0)-FePt thin film to lower Curie temperature

作者：Ono Takuya^*; Nakata Hitoshi; Moriya Tomohiro; Kikuchi Nobuaki; Okamoto Satoshi; Kitakami Osamu; Shimatsu Takehito

来源：Applied Physics Express, 2016, 9(12): 123002.

DOI：10.7567/APEX.9.123002

The addition of Ru to L1(0) (fct)-FePt thin films was investigated to lower the Curie temperature (T-c) of the films, which is beneficial for heat-assisted magnetic recording. The FePtRu films exhibited L1(0)-ordering and perpendicular anisotropy for Ru contents up to at least 18 at. %, and T-c was reduced by > 100 degrees C/6 at.% Ru independent of the Fe/Pt ratio between 0.8 and 1.1. The Tc versus uniaxial magnetic anisotropy diagrams exhibited a linear trend similar to that of FePtCu films but with a larger slope. Systematic analysis clarified that the Ru additive caused a slight decrease of the anisotropic field but greatly decreased the saturation magnetization, which was related to the observed reduction in T-c.

• 出版日期2016-12