Room temperature magnetoresistance in a polyimide-Co granular film synthesized by vapor deposition polymerization

Kazuya Z. Suzuki, Hideto Yanagihara, Tomohiko Niizeki, Ken Kojio, Eiji Kita

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Magnetic and magnetotransport properties of pyromellitic dianhydride-4,4′-oxydianiline polyimide-Co granular thin films prepared by vapor deposition polymerization are investigated. The prepared sample is composed of Co particles with diameters of 2-3 nm homogeneously dispersed in a denatured polyimide matrix. The temperature dependence of the resistivity closely follows the T - 1 / 2 law, suggesting that the dominant conduction mechanism is tunneling between metallic granules embedded in the insulating polyimide matrix. The magnetoresistances at 300 and 90 K are 2.6 and 3.0, respectively. The results indicate that polyimide is a promising material for organic spintronics.

Original languageEnglish
Article number222401
JournalApplied Physics Letters
Issue number22
Publication statusPublished - Nov 26 2012


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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