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Giant Magnetoresistance of Electrostatic Self-Assembled Fe3O4 Nanocluster and Polymer Thin-Films

Published online by Cambridge University Press:  21 February 2011

Yanjing Liu ,
Richard O. Claus  and
Fajian Zhang
Yanjing Liu
Affiliation:
NanoSonic, Inc., P.O. Box 618, Christiansburg, VA 24068
Richard O. Claus
Affiliation:
Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24060-0356
Fajian Zhang
Affiliation:
Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24060
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Abstract

Giant magnetoresistance (GMR) as large as 25% at 25°C has been observed for multilayer ultrathin films of iron oxide (Fe3O4) nanoclusters and polyimide molecules alternately adsorbed onto single crystal silicon and quartz substrates using a novel self-assembly technique. This process involves the alternate dipping of a substrate into an aqueous solution of anionic polyimide precursor (polyamic salt, PAA) followed by dipping it into an aqueous solution of cationic polydiallyldimethylammonium chloride (PDDA)-coated Fe3O4, nanoparticles. The regular formation of alternating monolayers is verified by UV-vis spectroscopy and contact angle measurements. Vibrating sample magnetometry indicates the formation of ultrasoft films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999 , 449
Copyright
Copyright © Materials Research Society 1999

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References

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