Influence of carbon ion dose on exchange field and GMR of irradiated PtMn-based spin valves

Author

Lai, Chih-Huang ; Yang, C.H. ; Niu, H.

Author_Institution

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

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2691

Lastpage

2693

Abstract

The effects were investigated of carbon ion dose on the exchange field and GMR ratio of irradiated PtMn-based spin valves. The exchange field increases with increasing dose in the low ion-dose-regime, which is attributed to the increase in PtMn(C) formation. The maximum enhancement of the exchange field can be as large as 50% for the ion dose of 2.0×10¹⁴ ions/cm². The reduction of the exchange field in the high-dose regime is probably due to the intermixing or carbon residue at the interface. The giant magnetoresistance (GMR) ratio monotonically decreases with increasing carbon dose. Ion irradiation shows different effects on fcc and fct PtMn samples. By proper annealing prior to irradiation, we can obtain a large enhanced exchange field and a reasonably good MR ratio.

Keywords

annealing; exchange interactions (electron); giant magnetoresistance; induced anisotropy (magnetic); ion beam mixing; magnetic hysteresis; magnetic multilayers; manganese alloys; platinum alloys; spin valves; PtMn; SIMS; annealing; carbon ion dose effects; exchange field; giant magnetoresistance; hysteresis loops; induced anisotropy; interface intermixing; ion implantation; ion irradiated spin valves; transmission electron microscopy; Annealing; Giant magnetoresistance; Helium; Iron; Magnetic films; Magnetic multilayers; Magnetic properties; Materials science and technology; Perpendicular magnetic anisotropy; Spin valves;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.803153

Filename

1042319