Regensburg 2000 – wissenschaftliches Programm
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AM: Magnetismus
AM 16: Dünne Schichten III: Magnetooptik, Nanostrukturen
AM 16.8: Vortrag
Mittwoch, 29. März 2000, 18:30–18:45, H10
Magnetism of 1-dimensional Co wires — •A. Dallmeyer1, P. Gambardella2, K. Maiti1, M.C. Malagoli1, C. Carbone1, W. Eberhardt1, and K. Kern2 — 1Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany — 2Institut de Physique Expérimentale, EPF-Lausanne, CH-1015 Lausanne
Monatomic Co wires can be grown by step-edge decoration of a vicinal Pt surface. The Co wires form a regular array on the Pt substrate, with a high degree of longitudinal coherence and an even lateral spacing. The magnetism of the monatomic wires was investigated over a wide range of temperature (10-300 K) and applied magnetic field (0-7 T) by x-ray magnetic circular dichroism at the ESRF. The ensemble of 1-D monatomic Co wires on Pt presents a magnetic behaviour well distinct from that of 2-D Co films and 3-D systems. The monatomic wires display a superparamagnetic behaviour over a wide temperature range, low susceptibility, but large magnetization at high field. The 1-D-character of the monatomic Co wires manifests itself in a strongly anisotropic and nearly uniaxial superparamagnetic response to the external magnetic field.