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Tuning magnetic interactions in ferromagnetic-metal nanoparticle systems

Satoshi Tomita, Kensuke Akamatsu, Hiroyuki Shinkai, Shingo Ikeda, Hidemi Nawafune, Chiharu Mitsumata, Takanari Kashiwagi, and Masayuki Hagiwara
Phys. Rev. B 71, 180414(R) – Published 27 May 2005

Abstract

We have experimentally studied the structure and magnetic interaction in Ni nanoparticle systems embedded in polymer matrices. The shrinkage of the matrices due to thermal decomposition leads to a decrease in the spacing among the particles, which maintain a fixed diameter of several nanometers. This is accompanied by a significant shift of electron magnetic-resonance signals. Based on the theoretical calculation, the shift is traced back to an enhancement of the magnetic dipolar interaction due to the diminution in the interparticle spacing, suggesting that we have succeeded in tuning the magnetic interaction in the nanoparticle systems.

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  • Received 10 December 2004

DOI:https://doi.org/10.1103/PhysRevB.71.180414

©2005 American Physical Society

Authors & Affiliations

Satoshi Tomita*

  • PRESTO, Japan Science and Technology Agency (JST), Wako, Saitama 351-0198, Japan

Kensuke Akamatsu, Hiroyuki Shinkai, Shingo Ikeda, and Hidemi Nawafune

  • Faculty of Science and Engineering, Konan University, Okamoto, Kobe 658-8501, Japan

Chiharu Mitsumata

  • Advanced Electronics Research Laboratory, Hitachi Metals Ltd., Kumagaya, Saitama 360-0843, Japan

Takanari Kashiwagi and Masayuki Hagiwara

  • KYOKUGEN (Research Center for Materials Science at Extreme Conditions), Osaka University, Toyonaka, Osaka 560-8531, Japan

  • *Electronic address: s-tomita@riken.jp
  • Electronic address: akamatsu@center.konan-u.ac.jp

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Issue

Vol. 71, Iss. 18 — 1 May 2005

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