Improved magnetic performance of Cobalt-based ribbons by nanocrystallization through magnetic annealing

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dc.contributor.authorAhmadian Baghbaderani, Hasan
dc.contributor.authorMasood, Ansar
dc.contributor.authorPavlovic, Zoran
dc.contributor.authorTeichert, Niclas
dc.contributor.authorÓ Mathúna, S. Cian
dc.contributor.authorMcCloskey, Paul
dc.contributor.authorStamenov, Plamen
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderHorizon 2020en
dc.date.accessioned2020-02-26T14:59:40Z
dc.date.available2020-02-26T14:59:40Z
dc.date.issued2020-02-19
dc.date.updated2020-02-25T11:24:07Z
dc.description.abstractPhase transformation driven soft magnetic properties have been correlated through different stages of nano-crystallization of Co-based amorphous alloys, via transverse magnetic annealing, by combining structural, magnetothermal, domain imaging, and AC/DC magnetometry techniques. The nano-crystallization starts by nucleation and growth process of soft magnetic meta-stable, thermodynamically favored, Co23B6 phase with less nucleation activation energy compared to other stable phases. In the second crystallisation stage, Co2B and Co3B, as a semi-hard magnetic phase, are identified in the alloys, magnetically annealed at 525 and 550 °C, respectively. Field-induced anisotropy dominates over the residual contributions of magneto-crystalline anisotropy of the phases, precipitated after field annealing at 510, 515, and 525 °C. The anomalous loss is significantly reduced as by annealing in a transverse magnetic field due to the reorientation of the preferred magnetisation axis, and consequently, change in dominant magnetization reversal mechanism from domain wall motion to magnetization rotation. In addition, magnetic annealing causes a measurable decrease in the domain width, which, in turn, promotes pinning and inhibits domain wall motion, thus further favours coherent domain rotation as the primary mechanism of magnetization. The combined mechanism of nanocrystallisation and coherent magnetisation rotation accounts for a 70% decrement in the anomalous loss in the so-processed ribbons at 525 °C, which renders them attractive for applications in mid- and high-frequency power supplies and inverters.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid166630en
dc.identifier.citationAhmadian Baghbaderani, H., Masood, A., Pavlovic, Z., Teichert, N., Ó. Mathúna, C., McCloskey, P. and Stamenov, P. (2020) 'Improved magnetic performance of Cobalt-based ribbons by nanocrystallization through magnetic annealing', Journal of Magnetism and Magnetic Materials, 503, 166630 (9 pp). doi:10.1016/j.jmmm.2020.166630en
dc.identifier.doi10.1016/j.jmmm.2020.166630en
dc.identifier.endpage9en
dc.identifier.issn0304-8853
dc.identifier.journaltitleJournal of Magnetism and Magnetic Materialsen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/9700
dc.identifier.volume503en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.projectinfo:eu-repo/grantAgreement/EC/H2020::MSCA-COFUND-FP/713567/EU/Cutting Edge Training - Cutting Edge Technology/EDGEen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Starting Investigator Research Grant (SIRG)/15/SIRG/3569/IE/Advanced Power Magnetics Programme for High Efficiency Power Supplies/en
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S0304885319331634
dc.rights© 2020 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 licence.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAmorphous alloysen
dc.subjectNano-crystallizationen
dc.subjectMagnetic annealingen
dc.subjectSoft magnetic propertiesen
dc.subjectMagnetization reversal processen
dc.subjectMagnetostructural transformationsen
dc.titleImproved magnetic performance of Cobalt-based ribbons by nanocrystallization through magnetic annealingen
dc.typeArticle (peer-reviewed)en
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