title: Synthesis of size-controlled cobalt ferrite particles with high coercivity and squareness ratio.
abstract: Cobalt ferrite particles with diameters ranging from a few micrometer to about 15 nm were synthesized using a modified oxidation process. The fine control of the particle size was achieved by introducing various concentrations of Fe(3+) ions at the beginning of the reaction. Among the particle sizes obtained by using this method, particles with a grain size of about 36 nm showed a magnetization (M(s)) of 64 emu/g and a maximum coercivity (H(c)) of 2020 Oe at room temperature. The corresponding squareness ratio was found to be 0.53.
authors.affiliation: Department of Geoscience and Technology, Tohoku University, Sendai 980-8579, Japan.
authors.forename: C N
authors.initials: CN
authors.lastname: Chinnasamy
authors.forename: M
authors.initials: M
authors.lastname: Senoue
authors.forename: B
authors.initials: B
authors.lastname: Jeyadevan
authors.forename: Oscar
authors.initials: O
authors.lastname: Perales-Perez
authors.forename: K
authors.initials: K
authors.lastname: Shinoda
authors.forename: K
authors.initials: K
authors.lastname: Tohji