High-frequency power loss mechanisms in ultra-thin amorphous ribbons
Citation:
Masood A., Baghbaderani H.A., Alvarez K.L., Blanco J.M., Pavlovic Z., Strom V., Stamenov P., Mathuna C.O., McCloskey P., High-frequency power loss mechanisms in ultra-thin amorphous ribbons, Journal of Magnetism and Magnetic Materials, 2021, Volume 519, 167469Download Item:
Abstract:
Soft magnetic amorphous materials with ultra-low power loss are highly desirable for high-frequency drive
applications. The present work demonstrates the high-frequency power loss performance and underlying loss
mechanisms in ultra-thin amorphous alloys. This is achieved by rapid-quenching amorphous alloys of Co-, CoFe-
and Fe-rich systems, investigating their amorphous atomic structure, quantifying the saturation magnetostriction
constants (λs ), imaging magnetic domains at remanent magnetization, analyzing magnetization reversal from
various magnetization levels, and finally, investigating the material loss performance over a broad frequency
range (f = 50 kHz–2 MHz) at various excitation levels (B m = 25–100 mT). The ultra-high performance of ultra-
thin Co-rich amorphous ribbons, as compared to CoFe- and Fe-rich alloys, was attributed to the significantly low
eddy current loss, due to the reduced thickness, and a minimal amount of excess loss, owning to minimal
magnetoelastic contributions and magnetization reversal by rotation. The underlying loss mechanisms were
analyzed by decomposing material loss into primary components and identifying the magnetization reversal
mechanisms using minor hysteresis loops. In the Co-rich amorphous alloys, we suggest that magnetization re-
versal by rotation dominates, at least at low excitations, while in CoFe- and Fe-rich alloys domain wall dis-
placement prevails and contributes significantly to the excess loss up to the MHz frequency range. Magnetization
reversal by rotation in Co-rich alloys could be attributed to the zero/near-zero λs , and eventually low residual
stress, leading to a homogeneous magnetic domain structure, as compared to the inhomogeneous “fingerprint-
like” complex domains in highly magnetostrictive CoFe-rich alloys.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
2015/SIRG/3569
Author's Homepage:
http://people.tcd.ie/stamenpDescription:
PUBLISHED
Author: Stamenov, Plamen
Type of material:
Journal ArticleCollections
Series/Report no:
Journal of Magnetism and Magnetic Materials;519;
Availability:
Full text availableKeywords:
amorphous atomic structure, Co-rich amorphous ribbons, ultra-low power loss, Excess loss, Eddy current loss, Materials loss mechanisms, High-frequency applications, Ultra-thin ribbons, Amorphous alloys, Soft magnetic materialsDOI:
http://dx.doi.org/10.1016/j.jmmm.2020.167469ISSN:
03048853Metadata
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