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Magnetoresistive phenomena in an Fe-filled carbon nanotube/elastomer composite

Hudziak, S; Darfeuille, A; Zhang, R; Peijs, T; Mountjoy, G; Bertoni, G; Baxendale, M; (2010) Magnetoresistive phenomena in an Fe-filled carbon nanotube/elastomer composite. NANOTECHNOLOGY , 21 (12) , Article 125505. 10.1088/0957-4484/21/12/125505.

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Abstract

DC magnetoresistive effects were observed in above-percolation-threshold loaded Fe-filled carbon nanotube/polyurethane-urea composite samples. A phenomenological model is derived from interpretation of resistance relaxation for a range of axial strains. The large instantaneous magnetoresistance of +90% observed at low axial strain was a result of conduction pathway breaking caused by preferential orientation of the conducting nanotubes perpendicular to the axial current flow: a result of the magnetic torque experienced by the ferromagnetic nanotube core. At large strain the observed large instantaneous change in resistance of -90% resulted from voltage-driven relaxation in the conducting nanotube network. At high axial strain the competition between voltage-driven relaxation and a magnetic torque gave rise to an oscillatory component of resistance relaxation.

Type:Article
Title:Magnetoresistive phenomena in an Fe-filled carbon nanotube/elastomer composite
DOI:10.1088/0957-4484/21/12/125505
Keywords:MAGNETIC-PROPERTIES, NANOTUBES, NANOWIRES, MOSSBAUER
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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