Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31313
Title: A double-quantum-well model of the exchange coupling in Fe/ZnSe/Fe
Authors: Hu, ZN
Wang, JZ
Li, BZ
Issue Date: 2001
Publisher: Institute of Physics Publishing
Source: Journal of physics condensed matter, 2001, v. 13, no. 11, p. l215-l223 How to cite?
Journal: Journal of physics condensed matter 
Abstract: In this letter, we investigate the interlayer exchange coupling between two finitely thick ferromagnets (FM), separated by a non-metallic spacer, taking into account the contributions from double-well states. It is found that the negative temperature coefficient of the exchange coupling can be explained by the resonant tunnelling between two FM wells, whereas the positive temperature coefficient for the antiferromagnetic coupling can be attributed to non-resonant tunnelling. Our calculation of the electronic structure indicates that this temperature dependence is related to the relative magnitudes of the densities of states close to the Fermi surface for the cases of parallel and antiparallel alignments of the FMs. Also, the present model provides us with a new physical explanation for recent experimental observations.
URI: http://hdl.handle.net/10397/31313
ISSN: 0953-8984
EISSN: 1361-648X
DOI: 10.1088/0953-8984/13/11/101
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