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Low Field Magnetoresistance at Room Temperature in CrO2 Doped Polyvinyl Alcohol Films

Published online by Cambridge University Press:  23 May 2011

S. Biswas  and
S. Ram
S. Biswas
Affiliation:
The LNM Institute of Information Technology, Jaipur-302031, India
S. Ram
Affiliation:
Materials Science Centre, Indian Institute of Technology, Kharagpur-721302, India
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Abstract

Ferromagnetic CrO2 nanoparticles embedded in a diamagnetic matrix of polyvinyl alcohol (PVA) presents an example of granular giant magnetoresistance (GMR) in a diluted magnetic composite structure. Usefully significant MR occurs at room temperature, viz. -6.8% in 3.0 wt% CrO2-PVA, at field as small as 1.1 kOe. We suggest that the system is a natural analogue to dilute ferro-fluid structures composed of nanoscale magnetic particles in a viscous organic fluid (diamagnetic as well as an electrical insulator), i.e., this material displays a GMR effect without an introduction of chemical interfaces. It has great potential in various applications and can also facilitate studies of magnetotransport properties in GMR materials.

Keywords

compositemagnetoresistance (transport)ferromagnetic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1359: Symposium NN – Electronic Organic and Inorganic Hybrid Nanomaterials—Synthesis, Device Physics and Their Applications , 2011 , mrss11-1359-nn08-06
Copyright
Copyright © Materials Research Society 2011

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References

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