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Magnetic and structural properties of epitaxial fcc Co layers on Cu(001) (invited)(abstract)

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1 Author(s)
Kirschner, J. ; Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D‐1000 Berlin 33, Germany

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We studied the magnetic properties, the electronic structure, and the growth mode of thin epitaxial cobalt films on Cu(001). The growth was studied by means of electron diffraction, Auger spectroscopy, and scanning tunneling microscopy. Cobalt grows in the layer‐by‐layer mode, with the lateral lattice constant determined by the copper substrate, in the face‐centered tetragonal crystal structure. The tetragonal distortion is perpendicular to the surface and amounts to a few percent as found by LEED studies. The films show a strong uniaxial anisotropy leading to strong in‐plane magnetization. A fourfold in‐plane anisotropy was observed, with the easy axis of magnetization along [011]. The Curie temperature of the films was studied in situ by the magneto‐optic Kerr effect. Tc varies strongly with film thickness from below 50 K at 1 ML to room temperature at about 2 ML. We found that the Curie temperature depends on the smoothness of the substrate as well as on the coverage by a copper layer. The coupling of cobalt double layers with copper intermediate layer was studied as a function of the thickness of the interlayer and the thickness of the top layer cobalt. We observed ferromagnetic/antiferromagnetic oscillatory exchange coupling with a rather short period (3–4 ML Cu).

Published in:

Journal of Applied Physics  (Volume:70 ,  Issue: 10 )

Date of Publication:

Nov 1991

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