Giant Magnetoresistance in Melt-Spun Co-Cu Modified by Rare Earths

• Authors: B. Idzikowski , U. Rössler , A. Handstein , K. Nenkov , K. Müller
• Languages of publication: EN

Abstracts

EN

Samples of the composition RE_{x}Co_{20}Cu_{80-x}, RE = Sm, Gd or Dy (x = 0, 1, and 3) were produced by melt-spinning and subsequent annealing. The magnetoresistance is negative as in granular Co-Cu, but its values depend on the kind of rare earth element added and on changes in the microstructure induced by thermal annealing. An addition of 1 at.% rare earth metal to Co_{20}Cu_{80} yields a considerable increase in the magnetoresistance ratio, whereas an addition of 3 at.% causes a decrease. E.g., by addition of 1 at.% Dy to Co_{20}Cu_{80} and optimal thermal treatment, the value of magnetoresistance ratio measured at 10 K in a field of 5 T increases from -14% to -28%. The effect can be attributed to the presence of clusters of hexagonal Dy(Co,Cu)_{5}, which was ascertained from X-ray diffraction data, or other, metastable rare-earth compounds and paramagnetic rare-earth atoms in the Cu matrix.

Keywords

EN

75.70.Pa; 75.50.Tt

Discipline

• 75.50.Tt: Fine-particle systems; nanocrystalline materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 97
• Issue: 5
• Pages: 791-794

Dates

published

2000-05

Contributors

author

B. Idzikowski

• Institut für Festkörper- und Werkstofforschung Dresden, P.O. Box 270016, 01171 Dresden, Germany
• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

U. Rössler

• Institut für Festkörper- und Werkstofforschung Dresden, P.O. Box 270016, 01171 Dresden, Germany

author

A. Handstein

• Institut für Festkörper- und Werkstofforschung Dresden, P.O. Box 270016, 01171 Dresden, Germany

author

K. Nenkov

• Institut für Festkörper- und Werkstofforschung Dresden, P.O. Box 270016, 01171 Dresden, Germany

author

K. Müller

• Institut für Festkörper- und Werkstofforschung Dresden, P.O. Box 270016, 01171 Dresden, Germany

Identifiers

DOI

10.12693/APhysPolA.97.791