Eur. Phys. J. AP 23, 49-54 (2003)
https://doi.org/10.1051/epjap:2003040

Structure related magnetic properties of MnZn ferrite with ultra-fine grain structure

¹ LESiR-ENS de Cachan, 61 avenue du Pdt. Wilson, 94235 Cachan Cedex, France
² CECM-CNRS, 15 rue Georges Urbain, 94407 Vitry-sur-Seine Cedex, France
³ LIMHP-UPR CNRS 1311, Université Paris Nord, 99 avenue J.B. Clément, 93430 Villetaneuse, France
⁴ LPEC-UMR CNRS 6087, Université du Maine, avenue Olivier Messiaen, 72085 Le Mans Cedex 09, France

Corresponding author: johan.moulin@satie.ens-cachan.fr

Received: 28 June 2002
Revised: 30 January 2003
Accepted: 4 March 2003
Published online: 12 June 2003

Abstract

Nanostructured ferrites have been prepared by milling starting from commercial ferrite powders. Subsequent compaction and sintering were applied to obtain cylindrical pieces. The magnetization as a function of the grain size follows the non magnetic grain boundary (NMGB) model. The boundary thickness is estimated as about 1.5 nm, which is consistent with that calculated from the Mössbauer absorption areas. Due to the high lattice distortion, the small exchange length impedes the averaging of the anisotropy.