Materials Transactions Online

Materials Transactions, Vol.47 No.01 (2006) pp.11-14
© 2006 The Japan Institute of Metals

Uncompensated Spin Elements in Ferromagnetic and Antiferromagnetic Bilayer with Non-Collinear Spin Structure

Chiharu Mitsumata1, Akimasa Sakuma2, Kazuaki Fukamichi3 and Masakiyo Tsunoda4

1Advanced Electronics Research Laboratory, Hitachi Metals Ltd., Kumagaya 360-0843, Japan
2Deptartment of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
3Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
4Department of Electronic Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

The exchange bias in a ferromagnetic (FM) and antiferromagnetic (AFM) bilayer with a γ-phase disordered structure has been investigated within a framework of Heisenberg model. The magnetic atoms in the AFM layer realize the triple Q structure due to geometrical spin frustrations. This non-collinear 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, accompanied by a shifted loop in magnetization curves, in accord with the measured loop by X-ray magnetic circular dichroism spectroscopy for an AFM layer.

(Received 2005/8/5; Accepted 2005/9/8; Published 2006/1/15)

Keywords: antiferromagnetic, exchange bias, exchange coupling, spin frustration, spin structure, non-collinear spin, Heisenberg model

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