Thin film magnetics for integrated magnetic nano-structures

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dc.availability.bitstreamembargoed
dc.check.date2028-05-31
dc.contributor.advisorMcCloskey, Paulen
dc.contributor.advisorO Mathuna, Cianen
dc.contributor.advisorexternalMasood, Ansaren
dc.contributor.authorCronin, Darragh
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2023-01-18T12:25:52Z
dc.date.available2023-01-18T12:25:52Z
dc.date.issued2022-11-01
dc.date.submitted2022-11-01
dc.description.abstractThe past decades have seen a surge in demand for highly miniaturised magnetic components which has been enabled by use of power circuitry high switching frequencies which require energy storage on a smaller scale. The optimal scale of this integration will be achieved with the complete integration of the power supply onto silicon. Hence there is a demand for soft magnetic materials for power conversion applications in the high MHz frequency range. These materials should exhibit crucial properties such as a low coercivity, high saturation magnetisation and a high resistivity for optimum performance. Methods to further optimise the intrinsic qualities of an ultra-soft magnetic material, CoZrTaB (CZTB) are presented. This includes methods to maintain in-plane, uniaxial magnetic anisotropy as well as efforts to produce composite soft magnetic materials such as CoZrTaB-N\textsubscript{2} via methods such as reactive sputtering. Furthermore Spin-Reorientation Transition in amorphous CZTB magnetic multilayers is investigated. This interesting phenomenon results from from a tuneable value of residual stress arising from a thermal shock effect at elevated temperatures, shifting the magnetic anisotropy from in-plane to out-of-plane. This study highlighted how external parameters such as stress and thermal effects can damage properties such as uniaxial magnetic anisotropy, essential for specific applications. Work on a novel soft magnetic composite – CoZrTaB-SiO\textsubscript{2} is also presented. This study involved the technique of co-sputtering to produce a composite amorphous magnetic and non-magnetic microstructure, comprehensively examining all aspects of the material and its vital properties resulting in an ultra-soft magnetic material. Moreover, this material exhibited an increased and tuneable resistivity, dependant on sputtering conditions. Finally, a detailed and systematic experiment to develop a low footprint inductor consisting of a 3-D vertical array of vertical copper cylinders (or pillars) coated in CZTB multilayers. This novel structure was designed for a low-footprint with high inductance-density values. This work focused precisely on the magnetic laminations and the techniques used to ensure vital properties were retained such as a low coercivity and a circumferential magnetic hard axis to correspond with the current induced magnetic field.en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationCronin, D. 2022. Thin film magnetics for integrated magnetic nano-structures. PhD Thesis, University College Cork.en
dc.identifier.endpage197en
dc.identifier.urihttps://hdl.handle.net/10468/14095
dc.language.isoenen
dc.publisherUniversity College Corken
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© 2022, Darragh Cronin.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectMagneticsen
dc.subjectMaterials Scienceen
dc.subjectPhysicsen
dc.subjectInductorsen
dc.subjectAmorphousen
dc.subjectNanocrystallineen
dc.subjectMagnetoelasticen
dc.subjectMagnetic materialsen
dc.subjectSputter depositionen
dc.subjectMagnetic anisotropyen
dc.subjectThin filmsen
dc.titleThin film magnetics for integrated magnetic nano-structuresen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD - Doctor of Philosophyen
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