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V. SANDU1,* , G. ALDICA1, E. SANDU2
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 %..
Extrinsic tunneling magnetoresistance, Polymer composite films, CrO2, Polystyrene, Variable range hopping.
V. SANDU, G. ALDICA, E. SANDU, Extrinsic tunneling magnetoresistance in thick films of CrO2-polystyrene composite, Optoelectronics and Advanced Materials - Rapid Communications, 1, 2, February 2007, pp.73-76 (2007).
Submitted at: Jan. 6, 2006
Accepted at: Jan. 15, 2007
Optoelectronics and Advanced Materials - Rapid Communications
(2024): Impact Factor = 0.4 - Journal Citation Reports (Clarivate Analytics, 2025)
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