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High-frequency powe...
High-frequency power loss mechanisms in ultra-thin amorphous ribbons
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Masood, A. (author)
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Baghbaderani, H. A. (author)
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Alvarez, K. L. (author)
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Blanco, J. M. (author)
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Pavlovic, Z. (author)
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- Ström, Valter (author)
- KTH,Materialvetenskap
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Stamenov, P. (author)
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Mathuna, C. O. (author)
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McCloskey, P. (author)
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(creator_code:org_t)
- Elsevier B.V. 2021
- 2021
- English.
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In: Journal of Magnetism and Magnetic Materials. - : Elsevier B.V.. - 0304-8853 .- 1873-4766. ; 519
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https://doi.org/10.1...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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 (Bm = 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 reversal by rotation dominates, at least at low excitations, while in CoFe- and Fe-rich alloys domain wall displacement 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Amorphous alloys
- Eddy current loss
- Excess loss
- High-frequency applications
- Materials loss mechanisms
- Soft magnetic materials
- Ultra-thin ribbons
- Amorphous materials
- Cobalt alloys
- Domain walls
- Eddy current testing
- Iron alloys
- Magnetic domains
- Magnetic materials
- Magnetostriction
- Nanocrystalline alloys
- Saturation magnetization
- Broad frequency range
- Co-rich amorphous alloys
- Domain wall displacement
- Magnetization reversal mechanisms
- Minor hysteresis loop
- Remanent magnetization
- Saturation magnetostriction
- Ultra high performance
- Magnetization reversal
Publication and Content Type
- ref (subject category)
- art (subject category)
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