Title :
Exchange bias model in ferromagnetic/antiferromagnetic bilayer with L12-type ordered antiferromagnet
Author :
Mitsumata, C. ; Sakuma, A. ; Fukamichi, K.
Author_Institution :
Adv. Electron. Res. Lab., Hitachi Metals Ltd, Kumagaya, Japan
Abstract :
The exchange bias of the ferromagnetic (FM) and antiferromagnetic (AFM) bilayer having L12-type ordered structure has been investigated within the framework of Heisenberg model. The triangle lattice of magnetic atoms in the AFM layer realizes the triangular spin structure due to geometrical spin frustrations. This noncollinear spin structure can bring about an exchange bias in the FM/AFM bilayer system. Under the influence of the exchange bias, the uncompensated spin element appears in the AFM layer, resulting in a shifted loop in magnetization curves, in accord with the measured loop by X-ray magnetic circular dichroism spectroscopy for an AFM layer.
Keywords :
antiferromagnetic materials; exchange interactions (electron); ferromagnetic materials; magnetic circular dichroism; magnetic multilayers; Heisenberg model; X-ray magnetic circular dichroism spectroscopy; antiferromagnet; antiferromagnetic bilayer; exchange bias model; ferromagnetic bilayer; geometrical spin frustration; magnetic atoms; magnetization curves; ordered structure; triangle lattice; triangular spin structure; Anisotropic magnetoresistance; Antiferromagnetic materials; Atomic layer deposition; Lattices; Magnetic anisotropy; Magnetic domains; Manganese alloys; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Soft magnetic materials; Antiferromagnetic (AFM); Heisenberg model; exchange bias; exchange coupling; noncollinear spin; spin frustration; spin structure;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.855223
