Frequency behaviour of Zn-Mn ferrites nanoparticles obtained by high-energy ball milling

Zinc-manganese spinel ferrites have been obtained by high-energy ball milli ng from precursors (1) oxides and carbonates and (2) acid oxides and hydrox ides. Results reveal that the use of one or another precursor leads to fina l products with different structural and magnetic characteristics. Measurem ents of the domain wall relaxation frequency exhibited differences dependin g on the type of precursor. These results are interpreted in terms of the v ariations in the magnetocrystalline anisotropy between the samples. (C) 199 9 Elsevier Science B.V. All rights reserved.