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Consequences of aging on ferromagnetic amorphous Fe75 Si10 B15 microwires for advanced inductive applications

AuthorsZhang, X.; Pérez del Real, Rafael ; Vázquez, Manuel; Lewis, L. H.
KeywordsAmorphous ferromagnetic microwires
Issue Date2019
PublisherAmerican Institute of Physics
CitationAIP Advances 9 (2019)
Abstract[EN] Amorphous ferromagnetic microwires fabricated by water-quenching have been assessed to show favorable properties for next-generation high-frequency electric machines as compared to those of conventional amorphous magnetic alloys in sheet or ribbon form. Here, waterquenched amorphous Fe75Si10B15 microwires were subjected to a range of aging times of up to 5 years in the air at room temperature. While both newer and aged microwires are X-ray amorphous, the aged microwires do exhibit a slight degree of crystallinity, a lower initial susceptibility and a reduced enthalpy change for full devitrification. These small differences (typically < 5%) are attributed to the formation of minor surface oxidation products such as iron oxides and SiO2 which modify the surface strain state. The resultant stress couples to magnetostriction to promote the formation of radial magnetic domains that impair the magnetic reversal process. These results demonstrate that while amorphous ferromagnetic microwires are essentially stable against aging in the air, consideration of their surface state will be significant for advanced applications.
Publisher version (URL)http://dx.doi.org/10.1063/1.5080098
Identifiersdoi: 10.1063/1.5080098
e-issn: 2158-3226
Appears in Collections:(ICMM) Artículos
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