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Journal of Composite Materials, Vol. 41, No. 23, 2843-2857 (2007)
DOI: 10.1177/0021998307079976

Magneto-Transport Properties of Compression Molded CrO2-Polymer Composite

J. Losby

Department of Physics, The University of Memphis Memphis, TN 38152, USA

S.R. Mishra

Department of Physics, The University of Memphis Memphis, TN 38152, USA, srmishra{at}memphis.edu

K. Ghosh

Department of Physics, Astronomy, and Materials Science, Missouri State University Springfield, MO 65897, USA

We report detailed electrical and magnetotransport properties of compression molded CrO2—Polyimide polymer composites. The electrical transport data of the composites in the temperature range of 15—300 K were analyzed using a two-channel conductivity model based on spin dependent tunneling and multi-step hopping. The low temperature conductance is essentially dominated by spin dependent tunneling. The contribution from the multi-hopping conductivity increases with temperature increase. The presence of significant magnetoresistance in this composite is attributed partially to the opening of new conduction channels at the CrO2—polymer interface.

Key Words: half-metal • half-metal—polymer composite • conductivity • magnetoresistance.


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