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Crystal-field Effect on Magnetic Moment and Exchange-Coupling for Fe/W(100) and Fe/W(110)

Published online by Cambridge University Press:  10 February 2011

X. Qian  and
W. Hübner
X. Qian
Affiliation:
Department of Physics, Colorado State University, Fort Collins, CO 80523, USA Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle, Germany
W. Hübner
Affiliation:
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle, Germany Department of Physics, Kaiserslautern University, Box 3049, D-67653 Kaiserslautern, Germany
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Abstract

The Full-potential Linearized Augmented Plane-wave (FP-LAPW) method was employed to investigate the magnetic properties of 1 monolayer (ML) Fe on W(100) and W(110) substrates. Magnetic moments of the Fe overlayer are found to be very different with ∼2.0 μB for Fe on W(100) and ∼2.56 μB for Fe on W(110). The exchange coupling between Fe film and W substrate are also found to be orientation-dependent. The electronic coupling in Fe/W(100) thin film is found to be more long-range, compared to the one in Fe/W(110). These differences could be explained by the differences of local atomic bonding and crystal-field splitting in these two orientations.

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