Relaxation time for an assembly of ferromagnetic nanoparticles under a randomly oriented magnetic field

 

A.  Housni1, S. Sayouri1*, A. Kaal1, R. Cherkaoui2, K. Limame1, A. Labzour3, A. Berrada2

1 LPTA, Département de Physique, Faculté des Sciences-DM, B.P. 1796, Fès Atlas, Maroc

2 LPM, Département de Physique, Faculté des Sciences Agdal, Rabat, Maroc

3 LPS, Département de Physique, Faculté des Sciences-DM, B.P. 1796, Fès Atlas, Maroc

* Corresponding author. E-mail: ssayouri@yahoo.com

Received: 03 January 2006; revised version accepted:22 June 2007

 

Abstract

     An analytical expression of relaxation time for an assembly of weakly interacting ferromagnetic nanoparticles under the influence of a randomly oriented magnetic field is derived. This new expression enables in particular the interpretation of M?ssbauer spectra recorded for such system.

 

Keywords: Ferromagnetic nanoparticles; Relaxation time; Energy barrier.

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