AIP Advances 9, 035114, 2019
Consequences of aging on ferromagnetic amorphous Fe75Si10B15 microwires for advanced inductive applications
X. Zhang, R. P. del Real, M. Vázquez and L. H. Lewis
doi.org/10.1063/1.5080098
Amorphous ferromagnetic microwires fabricated by in-water-quenching are assessed to show favorable properties as compared to those in sheet or ribbon form. In-water-quenched amorphous Fe75Si10B15 microwires prepared at ICMM/CSIC were subjected to aging up to 5 years time in air at room temperature. While both newer and aged microwires are X-ray amorphous, the aged ones exhibit a slight crystallinity degree, a lower initial susceptibility and a reduced enthalpy change for full devitrification. Such small differences (typically < 5%) are attributed to minor surface oxidation whose stress couples to magnetostriction to promote the formation of radial domains. This study demonstrates that amorphous microwires are essentially stable against aging in the air, a key point for advanced applications for next-generation high-frequency electric machines.
This article derives from the 2017 Sabbatical visit at the ICMM/CSIC of Prof. Laura H. Lewis from Northeastern University, Boston, funded by the National Science Foundation, U.S.A.
