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Title: Controlled magnetic properties of Ni nanoparticles embedded in polyimide films
Authors: Tomita, Satoshi
Joensson, Petra E.
Akamatsu, Kensuke
Nawafune, Hidemi
Takayama, Hajime
Issue Date: Nov-2007
Publisher: American Physical Society
Volume: 76
Issue: 17
Article Number: 174432
Abstract: We have studied the magnetic properties of Ni nanoparticles incorporated in polyimide films using dc- and ac-magnetization measurements. Transmission electron microscopy images reveal that both the mean particle diameter (d_ave) and the volume fraction of particles (η_ave) in the composite layer can be controlled independently. In a series of samples with fixed d_ave, the system with the lowest η_ave behaves magnetically as an ensemble of noninteracting superparamagnets. With increasing η_ave, typical signatures of the dipole-dipole interparticle interaction, such as an enhanced blocking temperature, are observed. In dense systems, with a particle concentration above the threshold for geometrical percolation, the magnetic response is ferromagnetic due to the exchange interaction between particles in direct contact.
ISSN: 1098-0121
Rights: Copyright (C) 2007 American Physical Society.
Text Version: publisher
Publisher DOI: 10.1103/PhysRevB.76.174432
Appears in Collections:物質創成科学研究科 / Graduate School of Materials Science

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