Fabrication of multilayered superparamagnetic particles based on sequential thermal deposition method

Hyonchol Kim, Hideyuki Terazono, Hiroyuki Takei, Kenji Yasuda*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A simple method for the fabrication of superparamagnetic particles was developed. Polystyrene spheres were used as templates, and their surfaces were coated with a magnetic element (Ni) by thermal deposition, controlling their thicknesses strictly. Magnetic properties of fabricated particles depended on the Ni layer thickness; the fabricated particles were typically superparamagnetic for a Ni layer thinner than 3nm and ferromagnetic for a Ni layer thicker than 4nm. For the improvement of the force generated on a particle in a magnetic field, the formation of multiple Ni layers on a particle was examined by sequential depositions of Ni and SiO2, isolating two Ni layers with a SiO2 layer. The SiO2 layer thickness should be larger than 10nm for a sufficient isolation of two Ni layers to maintain the superparamagnetic properties of the particle, and the magnetic charge of the particle increased proportionally with the number of Ni layers on a particle. These results indicate that enhanced superparamagnetic particles with various diameters can easily be fabricated by the suggested method.

Original languageEnglish
Article number06JJ01
JournalJapanese journal of applied physics
Issue number6 SPEC. ISSUE
Publication statusPublished - 2014 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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