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MICROSTRUCTURAL MAGNETIC PARAMETERS OF Nd-Fe-B NANOCOMPOSITES

M. Marinescu1,* , H. Chiriac1

Affiliation

  1. National Institute of R&D for Technical Physics, 47 Mangeron Blvd., 700050 Iasi, ROMANIA

Abstract

Samples with the composition: Nd8Fe77Co5CuNb3B6 and Nd8Fe78Co5Si3B6 have been prepared in form of ribbons (thickness of about 20 mm) by rapid quenching using the melt spinning technique. The samples obtained with amorphous structure have been subsequently devitrified by annealing at 700 oC for 5min. with the aim of inducing the magnetic hardness and obtaining, in particular, magnetically two-phase aFe/ Nd2Fe14B –type systems, coupled via exchange interactions (Nd8Fe77Co5CuNb3B6) and decoupled (Nd8Fe78Co5Si3B6). The maximum value of the fluctuation field for both coupled and decoupled systems is m0Sv @ 0.6 mT, found at applied fields close to coercive field. The activation volume, in which the magnetic moments are reversed by the local energy fluctuation, is v @ 5900 nm3 for the coupled system and v @ 5200 nm3 for the decoupled system..

Keywords

Nd-Fe-B nanocomposites, Fluctuation field, Activation volume.

Submitted at: June 2, 2004
Accepted at: June 22, 2004

Citation

M. Marinescu, H. Chiriac, MICROSTRUCTURAL MAGNETIC PARAMETERS OF Nd-Fe-B NANOCOMPOSITES, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 3, pp. 939-942 (2004)