Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 22: Magnetische dünne Schichten IV
MA 22.6: Vortrag
Dienstag, 8. März 2005, 11:45–12:00, TU H1012
Ferromagnetic Cr and antiferromagnetic Co: Unexpected magnetism of 3d transition-metal monolayers on W(001) — •Paolo Ferriani1, Stefan Heinze1, Gustav Bihlmayer2, and Stefan Blügel2 — 1Institut für Angewandte Physik, Universität Hamburg, Jungiusstrasse 9a, 20355 Hamburg — 2Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich
In the past, first-principles calculations of 3d transition-metal monolayers on (001) surfaces of non-magnetic metals have led to the conclusion that the early 3d metals V, Cr, and Mn possess a c(2×2) antiferromagnetic (AFM) ground state while Fe, Co, and Ni are ferromagnetic. For Fe on W(001), however, first-principles calculations so far remained non-conclusive while experiments could not find any magnetic order. Here, we present density-functional theory based calculations of 3d transition-metal monolayers on W(001) using the full-potential linearized augmented plane wave (FLAPW) method. Surprisingly, the normal trend is inverted, i.e. V, Cr and Mn are ferromagnetic while Fe and Co are c(2× 2) antiferromagnetic on W(001). Ni is non-magnetic. Recently, the AFM ground state of Fe has been confirmed experimentally by spin-polarized scanning tunneling microscopy [1].
[1] A. Kubetzka, P. Ferriani, et al., submitted for publication.
See also talk by A. Kubetzka et al. at this DPG meeting.