Restriction lift date: 2028-05-31
Thin film magnetics for integrated magnetic nano-structures
dc.availability.bitstream | embargoed | |
dc.check.date | 2028-05-31 | |
dc.contributor.advisor | McCloskey, Paul | en |
dc.contributor.advisor | O Mathuna, Cian | en |
dc.contributor.advisorexternal | Masood, Ansar | en |
dc.contributor.author | Cronin, Darragh | |
dc.contributor.funder | Science Foundation Ireland | en |
dc.date.accessioned | 2023-01-18T12:25:52Z | |
dc.date.available | 2023-01-18T12:25:52Z | |
dc.date.issued | 2022-11-01 | |
dc.date.submitted | 2022-11-01 | |
dc.description.abstract | The 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.status | Not peer reviewed | en |
dc.description.version | Accepted Version | en |
dc.format.mimetype | application/pdf | en |
dc.identifier.citation | Cronin, D. 2022. Thin film magnetics for integrated magnetic nano-structures. PhD Thesis, University College Cork. | en |
dc.identifier.endpage | 197 | en |
dc.identifier.uri | https://hdl.handle.net/10468/14095 | |
dc.language.iso | en | en |
dc.publisher | University College Cork | en |
dc.relation.project | info: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.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | en |
dc.subject | Magnetics | en |
dc.subject | Materials Science | en |
dc.subject | Physics | en |
dc.subject | Inductors | en |
dc.subject | Amorphous | en |
dc.subject | Nanocrystalline | en |
dc.subject | Magnetoelastic | en |
dc.subject | Magnetic materials | en |
dc.subject | Sputter deposition | en |
dc.subject | Magnetic anisotropy | en |
dc.subject | Thin films | en |
dc.title | Thin film magnetics for integrated magnetic nano-structures | en |
dc.type | Doctoral thesis | en |
dc.type.qualificationlevel | Doctoral | en |
dc.type.qualificationname | PhD - Doctor of Philosophy | en |
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