Xiong Zhi-Jie(熊知杰)a), Wang Huai-Yu(王怀玉)b)†, and Ding Ze-Jun(丁泽军)a)
a Department of Physics, University of Science and Technology of China, Hefei 230026, China; b Department of Physics, Tsinghua University, Beijing 100084, China
Abstract The exchange bias of bilayer magnetic films consisting of ferromagnetic (FM) and antiferromagnetic (AFM) layers in an uncompensated case is studied by use of the many-body Green's function method of quantum statistical theory. The effects of the layer thickness and temperature and the interfacial coupling strength on the exchange bias HE are investigated. The dependence of the exchange bias HE on the FM layer thickness and temperature is qualitatively in agreement with experimental results. When temperature varies, both the coercivity HC and HE decrease with the temperature increasing. For each FM thickness, there exists a least AFM thickness in which the exchange bias occurs, which is called pinning thickness.
Received: 24 November 2006
Revised: 18 January 2007
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
(Magnetic properties of monolayers and thin films)
Fund: Project supported
by the National~Natural Science Foundation of China (Grant Nos
10574121, 90406024 and 10025420), Chinese Education Ministry and
Chinese Academy of Sciences.
Cite this article:
Xiong Zhi-Jie(熊知杰), Wang Huai-Yu(王怀玉), and Ding Ze-Jun(丁泽军) Theoretical investigation of exchange bias 2007 Chinese Physics 16 2123
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