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Journal of Applied Physics -- December 1, 1997 -- Volume 82, Issue 11, pp. 5560-5563

Evidence of a temperature induced enhancement of giant magnetoresistance in Fe_{1 - x}Co_x/Cr superlattices

C. T. Yu, K. Westerholt, K. Theis-Bröhl, and H. Zabel

Institut für Experimentalphysik / Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

(Received 28 May 1997; accepted 11 August 1997)

We have studied the giant magnetoresistance (GMR) of antiferromagnetically coupled Fe_{1 - x}Co_x/Cr superlattices in the temperature range between 77 K and 296 K. We find that the field induced net change of the magnetoresistance (R) increases with increasing temperature. This unusual temperature dependence of the GMR effect can be modeled by a positive linear temperature dependent term together with a negative quadratic temperature dependent term. The temperature induced GMR enhancement is attributed to inelastic phonon scattering, which becomes spin-dependent in a system with strong spin asymmetry of the electronic band structure. ©1997 American Institute of Physics.

PII: S0021-8979(97)05722-8
DOI: 10.1063/1.366415
PACS: 75.70.Cn, 75.70.Pa, 75.50.Bb, 75.50.Ee, 72.15.Gd, 72.15.Qm, 73.40.Jn, 73.61.At        Additional Information

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