K Kawaguchi

Publications (2)2.93 Total impact

• Article: FePt nanoparticles fabricated by pulsed laser ablation.

  K Kawaguchi, R Wu, Y Ishikawa, T Sasaki, N Koshizaki
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  ABSTRACT: Two unique laser processes of 'PLA in low vacuum (PLALV)' and 'PLA in liquid (PLAL)' have been examined to fabricate FePt nanoparticles and the magnetic and structural properties were investigated. The particles as prepared by PLALV showed a superparamagnetic behavior with an fcc structure. The annealing temperature dependence of the transformation from fcc to fct structure was studied by the structural and magnetic properties. A large coercivity of 3.6 kOe at 300 K was obtained by the low temperature (500 C) annealing. Composition deviation due to Fe dissolution in PLAL process was successfully suppressed by Ar bubbling.
  Journal of Nanoscience and Nanotechnology 03/2009; 9(2):1454-7. · 1.56 Impact Factor
• Article: Preparation of Gold/Iron Oxide Composite Nanoparticles by a Laser-Soldering Method

  K. Kawaguchi, J. Jaworski, Y. Ishikawa, T. Sasaki, N. Koshizaki
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  ABSTRACT: Gold and magnetite composite nanoparticles have been prepared by a unique laser process. Both source colloid solutions of gold and magnetite were mixed and irradiated by an Nd:YAG laser (532 nm). The composite formation by a “nanosoldering” effect was confirmed by microscope observations.
  IEEE Transactions on Magnetics 11/2006; · 1.36 Impact Factor