Ultra-soft magnetic Co-Fe-B-Si-Nb amorphous alloys for high frequency power applications

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dc.contributor.authorAckland, Karl
dc.contributor.authorMasood, Ansar
dc.contributor.authorKulkarni, Santosh
dc.contributor.authorStamenov, Plamen
dc.contributor.funderEuropean Regional Development Fund
dc.contributor.funderEnterprise Ireland
dc.contributor.funderScience Foundation Ireland
dc.date.accessioned2018-05-02T10:16:21Z
dc.date.available2018-05-02T10:16:21Z
dc.date.issued2018
dc.description.abstractWith the continuous shrinkage of the footprint of inductors and transformers in modern power supplies, higher flux, while still low-loss metallic replacements of traditional ferrite materials are becoming an intriguing alternative. One candidate replacement strategy is based on amorphous CoFeBSi soft-magnetic alloys, in their metallic glass form. Here the structural and magnetic properties of two different families of CoFeBSi-based soft magnetic alloys, prepared by arc-melting and subsequent melt spinning (rapid quenching) are presented, targeting potential applications at effective frequencies of 100 kHz and beyond. The nominal alloy compositions are Co67Fe4B11Si16Mo2 representing commercial Vitrovac and Co72-xFexB28-y (where B includes non-magnetic elements such as Boron, Silicon etc. x varies between 4 and 5 % and y is varied from 0 to 2 %) denoted Alloy #1 and prepared as a possible higher performance alternative, i.e. lower power loss and lower coercivity, to commercial Vitrovac. Room temperature magnetization measurements of the arc-melted alloys reveal that compared to Vitrovac, Alloy #1 already presents a ten-fold decrease in coercivity, with H-c similar to 1.4 Am-1 and highest figure of merit of (M-s/H-c > 96). Upon melt-spinning the alloys into thin (< 30 mu m) ribbons, the alloys are essentially amorphous when analyzed by XRD. Magnetization measurements of the melt-spun ribbons demonstrate that Alloy #1 possesses a coercivity of just 2 Am-1, which represents a significant improvement compared to melt-spun ribbons of Vitrovac (17 Am-1). A set of prototype transformers of approximately 10 turns of Alloy #1 ribbon exhibits systematically H-c < 10 Am-1 at 100 kHz, without a noticeable decrease in coupled flux and saturation. (C) 2018 Author(s).en
dc.description.sponsorshipEnterprise Ireland (Commercialization Fund (EI-CF/2016); Science Foundation Ireland (Starting Investigator Research Grant (SIRG)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid56129
dc.identifier.citationAckland, K., Masood, A., Kulkarni, S. and Stamenov, P. (2018) 'Ultra-soft magnetic Co-Fe-B-Si-Nb amorphous alloys for high frequency power applications', AIP Advances, 8(5), 056129 (7pp). doi: 10.1063/1.5007707en
dc.identifier.doi10.1063/1.5007707
dc.identifier.issn2158-3226
dc.identifier.issued5
dc.identifier.journaltitleAIP Advancesen
dc.identifier.urihttps://hdl.handle.net/10468/5927
dc.identifier.volume8
dc.language.isoenen
dc.publisherAmerican Institute of Physicsen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2278/IE/Advanced Materials and BioEngineering Research Centre (AMBER)/
dc.relation.urihttps://aip.scitation.org/doi/10.1063/1.5007707
dc.rights© 2018, the Author(s). Published by AIP Publishing. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMaterialsen
dc.subjectFerromagnetismen
dc.subjectMetalsen
dc.subjectDiffraction opticsen
dc.subjectCondensed matter propertiesen
dc.subjectCrystallographyen
dc.subjectMagnetismen
dc.subjectMetallurgyen
dc.subjectLight diffractionen
dc.subjectPhase transitionsen
dc.titleUltra-soft magnetic Co-Fe-B-Si-Nb amorphous alloys for high frequency power applicationsen
dc.typeArticle (peer-reviewed)en
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