CoFe2O4 fine powders with particle sizes between 43 Å (4.3 nm) and 465 Å (46.5 nm) were produced by a method of 'gentle' chemistry. It was found that a surface layer with thickness of about 10 Å does not contribute to the magnetization in the fields used. Maximum coercivity of 14 kOe and reduced remanence of 0.64 were measured at 5 K after magnetization in 50 kOe indicating a cubic-type magnetocrystalline anisotropy.
- Anisotropy - multi-axial
- Fine particles