Synthesis of size-controlled cobalt ferrite particles with high coercivity and squareness ratio.
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.
Chinnasamy
C N
CN
Department of Geoscience and Technology, Tohoku University, Sendai 980-8579, Japan.
Senoue
M
M
Jeyadevan
B
B
Perales-Perez
Oscar
O
Shinoda
K
K
Tohji
K
K