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

doi:10.1063/1.4768783

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

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

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 language	English
Article number	222401
Journal	Applied Physics Letters
Volume	101
Issue number	22
DOIs	https://doi.org/10.1063/1.4768783
Publication status	Published - Nov 26 2012
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4768783

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@article{2187550768c84277acd45e87fc1f2402,

title = "Room temperature magnetoresistance in a polyimide-Co granular film synthesized by vapor deposition polymerization",

abstract = "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.",

author = "Suzuki, {Kazuya Z.} and Hideto Yanagihara and Tomohiko Niizeki and Ken Kojio and Eiji Kita",

note = "Funding Information: We are indebted to Dr. T. Nagata and S. Kanai at ULVAC, Inc., for their assistance with the ATR-IR measurements. Thanks are also due to T. Uchida of the Engineering Workshop Division, University of Tsukuba for building the evaporation system. Special thanks are due to Y. Shibuya, K. Shimada, and T. Watanabe for their help with the experiments. This work was partly supported by a Grant-in-Aid for Scientific Research on Priority Area “Creation and Control of Spin Current (21019005, 20042005)” from MEXT, Japan. ",

year = "2012",

month = nov,

day = "26",

doi = "10.1063/1.4768783",

language = "English",

volume = "101",

journal = "Applied Physics Letters",

issn = "0003-6951",

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TY - JOUR

T1 - Room temperature magnetoresistance in a polyimide-Co granular film synthesized by vapor deposition polymerization

AU - Suzuki, Kazuya Z.

AU - Yanagihara, Hideto

AU - Niizeki, Tomohiko

AU - Kojio, Ken

AU - Kita, Eiji

N1 - Funding Information: We are indebted to Dr. T. Nagata and S. Kanai at ULVAC, Inc., for their assistance with the ATR-IR measurements. Thanks are also due to T. Uchida of the Engineering Workshop Division, University of Tsukuba for building the evaporation system. Special thanks are due to Y. Shibuya, K. Shimada, and T. Watanabe for their help with the experiments. This work was partly supported by a Grant-in-Aid for Scientific Research on Priority Area “Creation and Control of Spin Current (21019005, 20042005)” from MEXT, Japan.

PY - 2012/11/26

Y1 - 2012/11/26

N2 - 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.

AB - 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.

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JF - Applied Physics Letters

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M1 - 222401

ER -

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

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