TY - JOUR
T1 - Magnetism of Fe-Co nanostructures on flat and stepped W(110) surfaces: Effects of dimensionality and substrate
AU - Spisak, Daniel
AU - Hafner, Juergen
N1 - Zeitschrift: Physical Review B - Condensed Matter and Materials Physics
DOI: 10.1103/PhysRevB.70.014430
Coden: PRBMD
Art-Nr: 014430
Affiliations: Institut für Materialphysik, Ctr. for Compl. Materials Science, Universität Wien, Sensengasse 8, A-1090 Wien, Austria
Adressen: Spi¹ák, D.; Institut für Materialphysik; Ctr. for Compl. Materials Science; Universität Wien; Sensengasse 8 A-1090 Wien, Austria; email: [email protected]
Import aus Scopus: 2-s2.0-19244365660
22.10.2007: Datenanforderung 1935 (Import Sachbearbeiter)
22.10.2007: Datenanforderung 1936 (Import Sachbearbeiter)
PY - 2004
Y1 - 2004
N2 - We present an ab initio local-spin-density investigation of the magnetism in nanostructures (ultrathin films, stripes, wires) of Fe, Co, and Fe-Co alloys on flat and stepped W(110) surfaces. Particular attention is devoted to the influence of the reduced dimensionality and of adsorbate-substrate hybridization on the magnetic properties. In pseudomorphic Fe-Co films on flat W(110) interface, hybridization is shown to strongly reduce the tendency towards ferromagnetic ordering with increasing Co content. Reconstructed close-packed Co films remain ferromagnetic. In biatomic Fe-Co stripes on W(970) surface, hybridization effects enhanced by relaxation lead to a rapid decrease of the magnetic energy differences with Co concentration. Monoatomic Fe-Co wires are predicted to order antiferromagnetically at all compositions. We demonstrate that antiferromagnetism results from the combined influence of the reduced dimensionality, the strain in the wires, and of the hybridization with the substrate.
AB - We present an ab initio local-spin-density investigation of the magnetism in nanostructures (ultrathin films, stripes, wires) of Fe, Co, and Fe-Co alloys on flat and stepped W(110) surfaces. Particular attention is devoted to the influence of the reduced dimensionality and of adsorbate-substrate hybridization on the magnetic properties. In pseudomorphic Fe-Co films on flat W(110) interface, hybridization is shown to strongly reduce the tendency towards ferromagnetic ordering with increasing Co content. Reconstructed close-packed Co films remain ferromagnetic. In biatomic Fe-Co stripes on W(970) surface, hybridization effects enhanced by relaxation lead to a rapid decrease of the magnetic energy differences with Co concentration. Monoatomic Fe-Co wires are predicted to order antiferromagnetically at all compositions. We demonstrate that antiferromagnetism results from the combined influence of the reduced dimensionality, the strain in the wires, and of the hybridization with the substrate.
U2 - 10.1103/PhysRevB.70.014430
DO - 10.1103/PhysRevB.70.014430
M3 - Article
SN - 1098-0121
VL - 70
JO - Physical Review B
JF - Physical Review B
IS - 1
M1 - 014430
ER -