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

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトル2003 Nanotechnology Conference and Trade Show - Nanotech 2003
編集者M. Laudon, B. Romanowicz
ページ134-136
ページ数3
出版ステータスPublished - 2003 12 1
イベント2003 Nanotechnology Conference and Trade Show - Nanotech 2003 - San Francisco, CA, United States
継続期間: 2003 2 232003 2 27

出版物シリーズ

名前2003 Nanotechnology Conference and Trade Show - Nanotech 2003
3

Other

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

ASJC Scopus subject areas

  • 工学(全般)

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