Journal of Magnetics

  • 제6권3호
  • /
  • Pages.94-100
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  • 2001
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  • 1226-1750(pISSN)
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  • 2233-6656(eISSN)
한국자기학회 (The Korean Magnetics Society)
권호 표지

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

  • Yang, Choong Jin (Research Institute of Industrial Science & Technology, Electromagnetic Materials,Lab.) ;
  • Kim, Kyung Soo (Dept. of Physics, Yeungnam University) ;
  • Wu, Jianmin (Dept. of Functional Materials, Centeral Iron & Steel Research Institute)
  • 발행 : 2001.09.01
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초록

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 600-80$0^{\circ}C$ for the phase separation of Fe-Co rich Fe-Co-Ni particles, followed by a post heating at $600^{\circ}C$ 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 nano-particles in a random arrangement on $Al_2O_3$substrate the particle assembly showed a behavior of dipole interactive ferromagnetic clusters depending on their volume and inter-particle distance.

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