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Extrinsic tunneling magnetoresistance in thick films of CrO2-polystyrene composite

V. SANDU1, G. ALDICA1,* , E. SANDU2

Affiliation

  1. National Institute of Materials Physics, Bucharest-Magurele, 077125, Romania
  2. National Institute of Physics and Nuclear Engineering “Horia Hulubei” Bucharest-Magurele, 077125, Romania

Abstract

Polystyrene-CrO2 composite films with extrinsic tunneling magnetoresistance have been obtained. The electric conduction is 2D Mott variable range hopping in the temperature range 77-300 K. The magnetoresistance is negative when the field is aligned parallel to the current (in-plane geometry) and is due to the spin dependent intergrain tunneling of the charge carriers. It reaches a value MR = -10.6 % at room temperature and a magnetic field of 1T. When the field is applied in-plane but perpendicular to the current the magnetoresistivity is positive and has the average value MR = 3.56 %..

Keywords

Extrinsic tunneling magnetoresistance, Polymer composite films, CrO2, Polystyrene, Variable range hopping.

Submitted at: May 30, 2007
Accepted at: July 15, 2007

Citation

V. SANDU, G. ALDICA, E. SANDU, Extrinsic tunneling magnetoresistance in thick films of CrO2-polystyrene composite, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 7, pp. 2121-2124 (2007)