Low-ordering-temperature fabrication of FePt by ion irradiation

Author

Yang, Cheng-Han ; Lai, Chih-Huang ; Chiang, C.C.

Author_Institution

Dept. of Mater. Sci. & Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2519

Lastpage

2521

Abstract

A low temperature ordering of L1₀ FePt phase was directly achieved by using 2-MeV He-ion irradiation without conventional post-annealing. The coercivity greater than 5700 Oe can be obtained by using ion-irradiation heating at temperature as low as 230°C. The high beam-current-density results in direct beam heating on samples. In addition, the irradiation-induced heating process provides efficient microscopic energy transfer and creates excess point defects, which significantly enhances the diffusion and promotes the formation of the ordered phase.

Keywords

ferromagnetic materials; ion beam effects; iron alloys; irradiation induced creep; platinum alloys; 2 MeV; 230 C; FePt; He-ion irradiation; beam-current-density; direct beam heating; ion irradiation; ion-irradiation heating; irradiation-induced heating process; low-ordering-temperature fabrication; microscopic energy transfer; ordered phase formation; point defects; Coercive force; Energy exchange; Fabrication; Heat transfer; Heating; Magnetic films; Magnetic hysteresis; Microscopy; Temperature; X-ray scattering; Beam heating; FePt; irradiation; ordering;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832279

Filename

1325556