Lack of magnetoacoustic emission in iron with 6.5% silicon

• Published in: Journal of magnetism and magnetic materials 2008-10, Vol.320 (20), p.2530-2533
• Main Authors: Augustyniak, B., Sablik, M.J., Landgraf, F.J.G., Jiles, D.C., Chmielewski, M., Piotrowski, L., Moses, A.J.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fe and its alloys; Iron alloy with 6.5% silicon; Magnetic properties and materials; Magnetoacoustic emission; Magnetomechanical and magnetoelectric effects, magnetostriction; Non-180° domain wall motion; Physics; Stress; Studies of specific magnetic materials; Zero magnetostriction
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2008.04.109

The phenomenon of magnetoacoustic emission (MAE) has been ascribed usually to one of two origins: either (1) motion of non-180° domain walls or (2) creation or annihilation of domains. In this paper, we present strong evidence for the argument that the only origin for MAE is motion of non-180° domain walls. The proof is evident as a result of measurements of zero MAE for a wide range of stress in the isotropic zero magnetostrictive polycrystalline alloy of iron with 6.5% silicon. We also explain why it was that the alternative origin was proposed and how the data in that same experiment can be reinterpreted to be consistent with the non-180° wall motion origin.