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No.3(pp.77-107)

Home > Issues > Volume 6 (2001) > No.3(pp.77-107)

Magnetic Behaviors of Isolated Fe-Co-Ni Nanoparticles in a Random Arrangement

Journal of Magnetics, Volume 6, Number 3, 30 Sep 2001, Pages 94-100

Choong Jin Yang*

(Research Institute of Industrial Science & Technology, Electromagnetic Materials,Lab.), Kyung Soo Kim(Dept. of Physics, Yeungnam University), Jianmin Wu(Dept. of Functional Materials, Centeral Iron & Steel Research Institute)

Abstract

Fe-Co-Ni particles with an average size of 45 and 135 nm are characterized in terms of magnetic phase transformation and magnetic properties at room temperature. BCC structure of Fe-Co-Ni spherical particles can be synthesized from Fe-Co-Ni-Al-Cu precursor films by heating at 600-800 ℃ for the phase separation of Fe-Co rich Fe-Co-Ni particles, followed by a post heating at 600 ℃ for 5 hours. The average size of nanoparticles was directly determined by the thickness of precursor films. Exchange interactive hysteresis was observed for the nano-composite (Fe-Co-Ni)+(Fe-Ni-Al) films resulting from the short exchange interface between ferromagnetic Fe-Co-Ni particles surrounded by almost papramagnetic Ni-Al-Fe matrix. Arraying the isolated Fe-Co-Ni nanoparticles in a random arrangement on Al₂O₃ substrate the particle assembly showed a behavior of dipole interactive ferromagnetic clusters depending on their volume and inter-particle distance.

Keywords: nanoparticle; Fe-Co-Ni ferromagnetic; spinodal decomposition; exchange coupling

DOI:

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