Static and dynamic magnetoelasticity

Graeme Dewar

doi:10.1117/12.432927

9 July 2001 Static and dynamic magnetoelasticity

Graeme Dewar

Proceedings Volume 4467, Complex Mediums II: Beyond Linear Isotropic Dielectrics; (2001) https://doi.org/10.1117/12.432927
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Magnetoelasticity encompasses a wide range of phenomena including, but not limited to, volume and Joule magnetostriction, the Villari effect, direct and inverse Wiedemann effects, the (Delta) E effect, and a magnetoelastic contribution to the apparent magnetic anisotropy. These effects are conveniently codified in a magnetoelastic energy density which, together with the magnetic (including exchange) and elastic energy densities, provides a consistent thermodynamic description of magnetoelasticity. In this review I shall briefly examine each of these effects and the corresponding terms of the energy density. This energy density is described by a collection of material constants which, in principle, are derivable from theory. The physical coordinates which are maintained constant in any experiment dictate the relevant combination of these material constants which is ultimately observed. Static and dynamic measurements are generally carried out with different constraints and, not surprisingly, these experiments measure different combinations of material parameters. For example, the highly magnetostrictive smart material Terfenol-D (Dy_0.73Tb_0.27Fe_1.95) has a static magnetic anisotropy which is markedly different from the anisotropy exhibited in a dynamic measurement.

Citation Download Citation

Graeme Dewar "Static and dynamic magnetoelasticity", Proc. SPIE 4467, Complex Mediums II: Beyond Linear Isotropic Dielectrics, (9 July 2001); https://doi.org/10.1117/12.432927

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