Size-control and size-selection at the nanosize level: Production of CoFe2O4 nanoparticles of unusual high coercivity at room temperature

C. N. Chinnasamy, B. Jeyadevan, O. Perales-Perez, K. Shinoda, K. Tohji, A. Kasuya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Among the various ferrite materials, cobalt ferrite (CoFe2O 4) is well known to possess excellent chemical stability and good mechanical hardness. Furthermore, the large positive first order crystalline anisotropy constant has made this ferrite a promising candidate for magneto-optical recording media. However, applications of CoFe2O 4 are often limited due to the lack of a synthesis technique capable to achieve a suitable control over particle size distribution, with particle diameters between the superparamagnetic and single domain sizes range. This control would permit to attain high coercivity and moderate magnetization at room temperature, which is critical for application of this material in actual devices. Here, we introduce a solution chemistry technique that involves a 'seeding step' followed by a size-selective particles separation that permits a fine size classification of single domain CoFe2O4 nanoparticles. The size-selected 40-nm particles reported room temperature coercivity as high as 4.6 kOe and a squareness ratio of 0.66.

Original languageEnglish
Title of host publication2003 Nanotechnology Conference and Trade Show - Nanotech 2003
EditorsM. Laudon, B. Romanowicz
Pages134-136
Number of pages3
Publication statusPublished - 2003 Dec 1
Event2003 Nanotechnology Conference and Trade Show - Nanotech 2003 - San Francisco, CA, United States
Duration: 2003 Feb 232003 Feb 27

Publication series

Name2003 Nanotechnology Conference and Trade Show - Nanotech 2003
Volume3

Other

Other2003 Nanotechnology Conference and Trade Show - Nanotech 2003
CountryUnited States
CitySan Francisco, CA
Period03/2/2303/2/27

Keywords

  • Cobalt ferrite
  • High coercivity
  • Nanoparticles
  • Seeding
  • Size-selection

ASJC Scopus subject areas

  • Engineering(all)

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