Control of Curie Temperature of FePt(Cu) Films Prepared From Pt(Cu)/Fe Bilayers

Author

Ikemoto, Jun-ichi ; Imai, Yasuharu ; Nakagawa, Shigeki

Author_Institution

Dept. of Phys. Electron., Tokyo Inst. of Technol., Tokyo

Volume

44

Issue

11

fYear

2008

Firstpage

3543

Lastpage

3546

Abstract

Addition of Cu into L1₀-ordered FePt alloy thin films with (001) preferential orientation results in the change of Curie temperature. Due to these aspects, the films have potential for next-generation high density perpendicular magnetic recording media, especially, heat-assisted magnetic recording (HAMR) media. FePt(Cu) films were fabricated by annealing Pt(Cu)/Fe bilayers prepared by facing targets sputtering. Their magnetic properties were investigated from room temperature to 300^deg C. As a result, it is possible to control Curie temperature from 150^degC to 250^deg C by changing the amount of Cu in FePt(Cu) films. In addition, we discuss required characteristics of medium for HAMR and mention that the Fe_55.3 Pt_37.5 (Cu)_7.2 film exhibited favorable characteristics for the HAMR medium.

Keywords

Curie temperature; annealing; copper alloys; iron alloys; magnetic thin films; perpendicular magnetic recording; platinum alloys; sputter deposition; Curie temperature; FePtCu; annealing; bilayers; heat-assisted magnetic recording medium; high density perpendicular magnetic recording medium; magnetic properties; sputtering; temperature 20 C to 300 C; thin film preparation; Curie temperature; FePt; FePt(Cu); heat-assisted magnetic recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2008.2001610

Filename

4717775