Addition of Ru to L10-FePt thin film to lower Curie temperature

Takuya Ono; Hitoshi Nakata; Tomohiro Moriya; Nobuaki Kikuchi; Satoshi Okamoto; Osamu Kitakami; Takehito Shimatsu

doi:10.7567/APEX.9.123002

Addition of Ru to L1₀-FePt thin film to lower Curie temperature

Takuya Ono, Hitoshi Nakata, Tomohiro Moriya, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The addition of Ru to L1₀ (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 L1₀-ordering and perpendicular anisotropy for Ru contents up to at least 18 at. %, and T_c was reduced by ∼100°C/6 at. % Ru independent of the Fe/Pt ratio between 0.8 and 1.1. The T_c 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.

Original language	English
Article number	123002
Journal	Applied Physics Express
Volume	9
Issue number	12
DOIs	https://doi.org/10.7567/APEX.9.123002
Publication status	Published - 2016 Dec

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Addition of Ru to L10-FePt thin film to lower Curie temperature",

abstract = "The addition of Ru to L10 (fct)-FePt thin films was investigated to lower the Curie temperature (Tc) of the films, which is beneficial for heat-assisted magnetic recording. The FePtRu films exhibited L10-ordering and perpendicular anisotropy for Ru contents up to at least 18 at. %, and Tc was reduced by ∼100°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 Tc.",

author = "Takuya Ono and Hitoshi Nakata and Tomohiro Moriya and Nobuaki Kikuchi and Satoshi Okamoto and Osamu Kitakami and Takehito Shimatsu",

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T1 - Addition of Ru to L10-FePt thin film to lower Curie temperature

AU - Ono, Takuya

AU - Nakata, Hitoshi

AU - Moriya, Tomohiro

AU - Kikuchi, Nobuaki

AU - Okamoto, Satoshi

AU - Kitakami, Osamu

AU - Shimatsu, Takehito

PY - 2016/12

Y1 - 2016/12

N2 - The addition of Ru to L10 (fct)-FePt thin films was investigated to lower the Curie temperature (Tc) of the films, which is beneficial for heat-assisted magnetic recording. The FePtRu films exhibited L10-ordering and perpendicular anisotropy for Ru contents up to at least 18 at. %, and Tc was reduced by ∼100°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 Tc.

AB - The addition of Ru to L10 (fct)-FePt thin films was investigated to lower the Curie temperature (Tc) of the films, which is beneficial for heat-assisted magnetic recording. The FePtRu films exhibited L10-ordering and perpendicular anisotropy for Ru contents up to at least 18 at. %, and Tc was reduced by ∼100°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 Tc.

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Addition of Ru to L1₀-FePt thin film to lower Curie temperature

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