Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Glassy Dynamics in Giant Magnetoresistive Melt-spun Co-Cu

  • Idzikowski, B. (Institut f r Festk per-und Werktofforschung Dresden, Physics, Polish Academy of Sciences, M. Smoluchwskiego 17) ;
  • RoBler, U.K. (Institut f r Festk per-und Werktofforschung Dresden) ;
  • Handstein, A. (Institut f r Festk per-und Werktofforschung Dresden) ;
  • Eckert, D. (Institut f r Festk per-und Werktofforschung Dresden) ;
  • Wolf, M. (Institut f r Festk per-und Werktofforschung Dresden) ;
  • Nenkov, K. (Institut f r Festk per-und Werktofforschung Dresden) ;
  • Muller, K.H. (Institut f r Festk per-und Werktofforschung Dresden)
  • Published : 1999.09.01
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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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References

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