Speaker
Description
Annealing of amorphous alloy Vitroperm-$800$ in the form of thin ribbons under tensile stress is very effective way of achieving huge value of magnetic anisotropy, which may well exceed the value of magneto-crystalline constant ($8$ kJ/m$^3$) of Fe-Si crystalline phase [1]. As a result of such thermo-mechanical treatment ribbons reveal perfectly linear hysteresis loop with constant slope (permeability) which can be controlled by applied stress. It has been shown in our recent work [2] that such stress induced anisotropy (SIA) is because Fe$_3$Si nanocrystalline grains growing in the tensile direction have a higher value of the lattice spacing as in case of transversal direction, where opposite behavior is seen. Furthermore it was demonstrated that the strain partitioning among different Bragg reflections of Fe$_3$Si phase is not even, and the magnitude of the SIA for a given set of Bragg reflections is inversely proportional to its Young’s modulus $E_{hkl}$.
Acknowledgements
This study was funded by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No. 09I03-03-V03-00034.
References
[1] G. Herzer et al., “Magnetic properties of nanocrystalline FeCuNbSiB with huge creep induced anisotropy,” Journal of Physics: Conference Series, vol. 266. IOP Publishing, p. 012010, Jan. 01, 2011. https://doi.org/10.1088/1742-6596/266/1/012010
[2] D. Yudina et al., “Structural aspects of stress-induced magnetic anisotropy in Fe-based nanocrystalline alloy,” Journal of Alloys and Compounds, vol. 960. Elsevier BV, p. 171011, Oct. 2023. https://doi.org/10.1016/j.jallcom.2023.171011
