Critical Angle Behavior of Exchange Bias and Coercivity in CoFe/MnIr Bilayers

Author

Kim, Dong Young ; Kim, CheolGi ; Kim, Chong-Oh ; Naka, M. ; Tsunoda, M. ; Takahashi, M.

Author_Institution

Res. Center for Adv. Magnetic Mater., Chungnam Nat. Univ.

Volume

42

Issue

10

fYear

2006

Firstpage

3011

Lastpage

3013

Abstract

Angular dependence of H_ex and H_c, and the critical angle behavior are measured in CoFe/MnIr bilayers annealed at 200degC and 340degC. The interfacial exchange coupling anisotropy and the antiferromagnet anisotropy at t_AF<t^c _AF are estimated from the best fitting of angular dependence of H_ex and H_c using Stoner-Wohlfarth (S-W) model. These results confirm existence of interfacial exchange coupling anisotropy between F and AF layers for t_AF<t^c _AF. The measured critical angles for t_AF>t^c _AF as well as for t_AF<t^c _AF are well explained using S-W model

Keywords

antiferromagnetic materials; cobalt alloys; coercive force; iridium alloys; iron alloys; magnetic anisotropy; manganese alloys; 200 C; 340 C; CoFe-MnIr; S-W model; Stoner-Wohlfarth model; angular dependence; antiferromagnet anisotropy; coercivity; critical AF thickness; critical angle behavior; exchange bias; interfacial exchange coupling anisotropy; Anisotropic magnetoresistance; Annealing; Antiferromagnetic materials; Coercive force; Couplings; Goniometers; Magnetic field measurement; Magnetic materials; Magnetization; X-ray diffraction; Critical AF thickness; Stoner–Wohlfarth model; critical angle; exchange bias and coercivity;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.879756

Filename

1704513