Speaker
Description
Magnetoelastic interactions are responsible for many interesting phenomena such as Joule magnetostriction, the Wiedemann effect, the Villari effect, effects on sound velocity, and many others. In this work[1], we investigate the effect of microstructure on saturation magnetostriction of Terfenol-D (Tb0.27Dy0.73Fe2) by means of Finite Element Method. The model is based on the equilibrium magnetoelastic strain tensor at magnetic saturation, and shows that the crystal orientation jointly with the grain volume fraction play a more significant role on saturation magnetostriction than the morphology of the grains. We also calculate the dependence of saturation magnetostriction on the dispersion angle of the distribution of grains in the oriented growth crystal directions < 011 > and < 111 >. This result evinces the importance of high-quality control of grain orientation in the synthesis of grain-aligned polycrystalline Terfenol-D. The input parameters, i.e. magnetostriction coefficients (100 and 111), could be determined using novel developed method [2,3] based on the first-principles calculations (microscopic scale) combined with classical spin-lattice simulations [4] (mesoscopic scale) within a multiscale approach. The computational aspects will be discussed.
References:
[1] P. Nieves, and D. Legut, Solid State Comm., 352, (2022), 114825
[2] P. Nieves, D. Legut et al, Comput. Phys. Comm., 271, (2022), 108197
[3] P. Nnieves, D. Legut et al, Comput. Mat. Sci. 224, (2023) 112158
[4] P. Nieves, D. Legut et al, Phys. Rev. B, 103 (2021), 094437
