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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 clampeddoi:10.1051/jp4:1997170 fatcat:cpqiefadmng4nnv5our3dnrbx4