Theoretical investigation of exchange bias |
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| Authors: | Xiong Zhi-Jie Wang Huai-Yu and Ding Ze-Jun |
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| Institution: | Department of Physics, University of Science and Technology of China, Hefei 230026, China; Department of Physics, Tsinghua University, Beijing 100084, China |
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| 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. |
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| Keywords: | exchange bias coercivity uncompensated case Heisenberg Hamiltonian |
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