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A Novel Fabrication Technique for Interacting Ferromagnetic-metal Nanoparticle Systems: Fine-tuning of Particle Diameter and Interparticle Spacing

Published online by Cambridge University Press:  01 February 2011

Satoshi Tomita
Affiliation:
PRESTO, Japan Science and Technology Agency, Wako, Saitama 351-0198, Japan
Kensuke Akamatsu
Affiliation:
Faculty of Science and Engineering, Konan University, Okamoto, Kobe 658-8501, Japan
Hiroyuki Shinkai
Affiliation:
Faculty of Science and Engineering, Konan University, Okamoto, Kobe 658-8501, Japan
Shingo Ikeda
Affiliation:
Faculty of Science and Engineering, Konan University, Okamoto, Kobe 658-8501, Japan
Hidemi Nawafune
Affiliation:
Faculty of Science and Engineering, Konan University, Okamoto, Kobe 658-8501, Japan
Chiharu Mitsumata
Affiliation:
Advanced Electronics Laboratory, Hitachi Metals Ltd., Kumagaya, Saitama 360-0843, Japan
Takanari Kashiwagi
Affiliation:
Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8431, Japan
Masayuki Hagiwara
Affiliation:
Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8431, Japan
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Abstract

Metallic Ni nanoparticles were embedded in polyimide (PI) films by applying a chemical surface modification technique. The technique consists of a simple alkali treatment of the PI films, an ion exchange reaction, and thermal annealing. The transmission electron microscopic studies showed that the initial alkali treatment time determined the diameter (d) of Ni nanoparticles formed by the annealing at 300 °C.With increasing the annealing time, the thickness of the composite layers containing Ni nanoparticles decreased while the d was almost constant. The shrinkage of the composite layer led to a decrease in the spacing (r) among Ni nanoparticles. The d and r can thus be fine-tuned independently. Electron magnetic resonance study clearly indicated that the tuning of d and r enable us to control the magnetic dipolar interaction in the Ni nanoparticle systems. The present technique opens a new way to realize tailor-made nanomagnetic structures.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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A Novel Fabrication Technique for Interacting Ferromagnetic-metal Nanoparticle Systems: Fine-tuning of Particle Diameter and Interparticle Spacing
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A Novel Fabrication Technique for Interacting Ferromagnetic-metal Nanoparticle Systems: Fine-tuning of Particle Diameter and Interparticle Spacing
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A Novel Fabrication Technique for Interacting Ferromagnetic-metal Nanoparticle Systems: Fine-tuning of Particle Diameter and Interparticle Spacing
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