Piezomagnetic behavior of Fe-Al-B alloys

Abstract : For the first time, the piezomagnetic behavior of polycrystalline Fe-Al-B alloys is accessed. Piezomagnetic factors of up to 4.0 kA.m −1 /MPa were reached for an interval of applied compressive stresses between 0 to-140 MPa. The experimental results together with a powerfull multiscale and bipha-sic modeling allowed the general understanding of the magnetostrictive and piezomagnetic behaviors of these materials. The magnetic and mechanical localizations as well as homogeneous stresses were considered in the modeling and are associated to the intrinsic presence of the Fe 2 B phase. The interplay of the magnetocrystalline anisotropy, initial susceptibility, saturation magnetostriction and texture were quantified by the model and compared to the experimental results. An improvement of the piezomagnetic factor to 15 kA.m −1 /MPa is predicted, for an alloy containing 20% of aluminum, by getting an adequate texture near < 100 > directions.
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Cristina Bormio-Nunes, Olivier Hubert. Piezomagnetic behavior of Fe-Al-B alloys. Journal of Magnetism and Magnetic Materials, Elsevier, 2015, 393, pp.404-418. ⟨10.1016/j.jmmm.2015.05.091⟩. ⟨hal-01560721⟩

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