Thickness dependence of the magnetic properties in ultrathin Co/Ge(1 1 1) films

The existence of a low-Curie-temperature phase for Co/Ge(111) films is proofed by performing surface magneto-optic Kerr effect measurements at 150K. The coercive force of the films increases slowly between 7.5 and 15 monolayers, and then increases promptly at larger thicknesses. The different increa...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2004-05, Vol.272-276, p.E829-E831
Main Authors: Tsay, J.S, Nieh, H.Y, Yang, C.S, Yao, Y.D
Format: Article
Language:English
Subjects:
Cobalt
Germanium
Magneto-optic Kerr effect
Ultrathin films
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Summary:The existence of a low-Curie-temperature phase for Co/Ge(111) films is proofed by performing surface magneto-optic Kerr effect measurements at 150K. The coercive force of the films increases slowly between 7.5 and 15 monolayers, and then increases promptly at larger thicknesses. The different increasing rates of the coercive force can be explained by the different interfacial roughness that influences the pinning of the domain walls.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2003.12.164