Colloque C 1, Suppl6ment au Journal de Physique I11 de mars 1997 Magneto Elastic Modes in Ferro or Ferrimagnetic Polycristals

Abstract. We propose a new method to compute the dimensional variations of fem or ferro magnetic materials induced by an electromagnetic wave. The algorithm used derives from a mechanical finite element method to solve stress and strain states of a solid. Magnetostriction is written using a quadratic relationship between deformation and magnetization. The results of the numerical computation for nickel samples show the complete frequency spectrum of magneto elastic modes of free standing or clamped sample. Experimental data obtained by measuring frequency dispersion permeabilities shows the coupling rays which are within 3.5 % agreement with the computed frequencies of magneto elastic modes. 1