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A Monte Carlo study of the temperature dependence of magnetic order on ferromagnetic and antiferromagnetic surfaces: Implications for spin‐polarized photoelectron diffraction (abstract)

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5 Author(s)
Zhang, F. ; Department of Physics, University of California, Davis, California 95616 ; Thevuthasan, S. ; Scalettar, R. T. ; Singh, R. R. P.
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We have used Ising‐model Monte Carlo calculations to study the magnetic order near cubic ferromagnetic and antiferromagnetic surfaces. The antiferromagnets were studied with and without frustrated next‐nearest‐neighbor interactions. Intralayer and interlayer spin‐spin correlation functions have been calculated as a function of the relative coupling strength in the surface layer. If this coupling strength is more than a few times the bulk value, a distinct surface phase transition is observed at temperatures TC,surf or TN,surf that can be significantly above the corresponding bulk values, TC,bulk or TN,bulk. These calculations suggest that previous spin‐polarized photoelectron diffraction measurements on antiferromagnetic KMnF3(110) and MnO(001) could in fact have been observing such surface transitions at TN,surf values of 2.7 and 4.5 times TN,bulk, respectively.

Published in:

Journal of Applied Physics  (Volume:76 ,  Issue: 10 )