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No.3(pp.73-106)

Home > Issues > Volume 4 (1999) > No.3(pp.73-106)

Glassy Dynamics in Giant Magnetoresistive Melt-spun Co-Cu

Journal of Magnetics, Volume 4, Number 3, 30 Sep 1999, Pages 76-79

B. Idzikowski(Institut für Festköper- und Werktofforschung Dresden, Institute of Molecular Physics, Polish Academy of Sciences), U. K. RoBler(Institut für Festköper- und Werktofforschung Dresden), A. Handstein(Institut für Festköper- und Werktofforschung Dresden), D. Eckert(Institut für Festköper- und Werktofforschung Dresden), M. Wolf(Institut für Festköper- und Werktofforschung Dresden), K. Nenkov(Institut für Festköper- und Werktofforschung Dresden), K. H. Muller(Institut für Festköper- und Werktofforschung Dresden)

Abstract

We report results on metastable CuCo ribbons at low Co contents (2 and 10 at%), which were prepared by conventional melt-spinning technique and subsequent annealing. The properties of these materials cannot consistently be described by those of an assembly of superparamagnetic single-domain particles. Magnetic measurements related to magnetic dynamics reveal spin-glass-like properties. Especially, we find very slow nonequilibrium relaxation processes in Co10Cu90, which depend on prehistory, when probing the relaxation of the resistivity. The results are clear evidence for frustrated interaction effects due to magnetic couplings between Co clusters or precipitates in these alloys.

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