Multimodal behavior of the dynamic magnetic susceptibility spectrum in amorphous CoZrTaB magnetic thin films

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dc.contributor.authorJordan, Declan
dc.contributor.authorWei, Guannan
dc.contributor.authorMasood, A.
dc.contributor.authorO'Mathuna, Cian
dc.contributor.authorMcCloskey, Paul
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderHorizon 2020en
dc.date.accessioned2021-11-17T12:11:56Z
dc.date.available2021-11-17T12:11:56Z
dc.date.issued2020-09-02
dc.date.updated2021-11-17T09:41:21Z
dc.description.abstractThe origins of sub-Ferromagnetic Resonance (FMR) multimodal behavior in the magnetic susceptibility spectrum of amorphous CoZrTaB magnetic thin films are investigated using Brown's diffusion model describing continuous diffusion of magnetic spins. Brown's diffusion model is regressed onto experimental data for the amorphous CoZrTaB magnetic thin films with thicknesses spanning 80-530nm. The mathematical model presented successfully reproduces the thickness dependent dynamic magnetic susceptibility of the amorphous CoZrTaB magnetic thin films with strong statistical significance. The model proposes the formation of additional energy wells in the uniaxial anisotropy energy plane of the material after a critical film thickness. The sub-FMR resonance peaks arise when the frequency of the external excitation field approaches the natural frequency of the well. Furthermore, the additional energy wells in the anisotropy energy plane cause a breakdown in the axial symmetry of the anisotropy energy plane. This breakdown of axial symmetry results in dynamic coupling between the transverse (chi(perpendicular to)) and longitudinal (chi(parallel to)) magnetic susceptibility. This dynamic coupling results in the initial low frequency step-down in the magnetic susceptibility observed in the thicker CoZrTaB magnetic thin films. It is found that the application of an external bias magnetic field along the easy axis of the amorphous CoZrTaB magnetic thin films suppresses the sub-FMR resonance peaks by restoring the axial symmetry of the anisotropy energy plane.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid093902en
dc.identifier.citationJordan, D., Wei, G., Masood, A., O'Mathuna, C. and McCloskey, P. (2020) 'Multimodal behavior of the dynamic magnetic susceptibility spectrum in amorphous CoZrTaB magnetic thin films', Journal of Applied Physics, 128, 093902 (8pp). doi: 10.1063/5.0013962en
dc.identifier.doi10.1063/5.0013962en
dc.identifier.eissn1089-7550
dc.identifier.endpage8en
dc.identifier.issn0021-8979
dc.identifier.journaltitleJournal of Applied Physicsen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/12224
dc.identifier.volume128en
dc.language.isoenen
dc.publisherAIP Publishingen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/H2020::RIA/721107/EU/GaN densily integrated with Si-CMOS for reliable, cost effective high frequency power delivery systems/GaNonCMOSen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Investigator Programme/15/IA/3180/IE/Advanced Integrated Power Magnetics Technology- From Atoms to Systems/en
dc.rights© 2020, the Authors. 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.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectResonanceen
dc.subjectInductorsen
dc.titleMultimodal behavior of the dynamic magnetic susceptibility spectrum in amorphous CoZrTaB magnetic thin filmsen
dc.typeArticle (peer-reviewed)en
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