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Spin Transport in Superconducting an...

Bromley, Daniel.

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Spin Transport in Superconducting and Ferromagnetic Heterostructures.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Spin Transport in Superconducting and Ferromagnetic Heterostructures./
作者:	Bromley, Daniel.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	217 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
Contained By:	Dissertations Abstracts International85-04B.
標題:	Motivation. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30614417
ISBN:	9798380482813

Spin Transport in Superconducting and Ferromagnetic Heterostructures.
Bromley, Daniel.

Spin Transport in Superconducting and Ferromagnetic Heterostructures. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 217 p.

Source: Dissertations Abstracts International, Volume: 85-04, Section: B.

Thesis (Ph.D.)--The University of Liverpool (United Kingdom), 2023.

This item must not be sold to any third party vendors.

This thesis details work investigating spin transport in superconductor-ferromagnet (S/F) and ferromagnet-heavy metal (F/HM) thin film heterostructures with the aim of controlling spin-dependent phenomena through careful engineering of interfaces.Thin film superconductors are typically grown using sputtered deposition. However, in this work, we demonstrate that electron beam evaporation (EBE) can deposit high-quality superconducting Nb thin films with consistently high transition temperatures and low interfacial roughnesses. Utilising these properties, we have successfully employed Nb as a buffer to produce the first examples of perpendicular magnetic anisotropy in EBE grown ultra-thin film Pt/Co/Pt stacks. The Nb buffer in these stacks still retains useful superconducting properties, presenting such heterostructures as simple routes to developing superspintronic devices where ultrathin layers where mixed magnetic anisotropy are key. Furthermore, we show the capabilities of electron beam evaporation to produce superconducting Nb nanowires, which is a significant advancement for the field of nanostructured superconductors.Next, we investigate the role of ultrathin HM microstructure morphology on spin transport properties within buffered F/HM bilayers. A comprehensive ferromagnetic resonance study on varying F and HM thicknesses and buffer type reveals that the HM microstructure plays a substantial role in spin transport, and with further consideration of extrinsic damping processes, the spin transport properties of the structure can be modulated. This is a significant contribution to those developing spintronic devices. Having gained knowledge of the factors governing spin transport in systems where the charge carriers are individual electrons, the subsequent results chapter aims to generate and characterise spin transport in S/F heterostructures, where the charge carriers take the form of bound state quasi-particles, known as Cooper pairs.Finally, we incorporate our Nb/Pt/Co/Pt heterostructures in superconducting spin valves in an effort to provide the inhomogeneous magnetic texture required for the generation of superconducting spin currents. We use polarised neutron reflectivity to examine the nature of the magnetic state of the heterostructure and probe for any changes that arise due to the onset of superconductivity. We then present attempts made to investigate super spin currents within the superconducting spin valves using a bespoke and first-of-its-kind time-resolved Magnetooptic Kerr effect (tr-MOKE) setup, opening the door to measuring superconducting spintronic characteristics without the need for large-scale facilities.

ISBN: 9798380482813Subjects--Topical Terms:

532704
Motivation.

Spin Transport in Superconducting and Ferromagnetic Heterostructures.
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520 $a This thesis details work investigating spin transport in superconductor-ferromagnet (S/F) and ferromagnet-heavy metal (F/HM) thin film heterostructures with the aim of controlling spin-dependent phenomena through careful engineering of interfaces.Thin film superconductors are typically grown using sputtered deposition. However, in this work, we demonstrate that electron beam evaporation (EBE) can deposit high-quality superconducting Nb thin films with consistently high transition temperatures and low interfacial roughnesses. Utilising these properties, we have successfully employed Nb as a buffer to produce the first examples of perpendicular magnetic anisotropy in EBE grown ultra-thin film Pt/Co/Pt stacks. The Nb buffer in these stacks still retains useful superconducting properties, presenting such heterostructures as simple routes to developing superspintronic devices where ultrathin layers where mixed magnetic anisotropy are key. Furthermore, we show the capabilities of electron beam evaporation to produce superconducting Nb nanowires, which is a significant advancement for the field of nanostructured superconductors.Next, we investigate the role of ultrathin HM microstructure morphology on spin transport properties within buffered F/HM bilayers. A comprehensive ferromagnetic resonance study on varying F and HM thicknesses and buffer type reveals that the HM microstructure plays a substantial role in spin transport, and with further consideration of extrinsic damping processes, the spin transport properties of the structure can be modulated. This is a significant contribution to those developing spintronic devices. Having gained knowledge of the factors governing spin transport in systems where the charge carriers are individual electrons, the subsequent results chapter aims to generate and characterise spin transport in S/F heterostructures, where the charge carriers take the form of bound state quasi-particles, known as Cooper pairs.Finally, we incorporate our Nb/Pt/Co/Pt heterostructures in superconducting spin valves in an effort to provide the inhomogeneous magnetic texture required for the generation of superconducting spin currents. We use polarised neutron reflectivity to examine the nature of the magnetic state of the heterostructure and probe for any changes that arise due to the onset of superconductivity. We then present attempts made to investigate super spin currents within the superconducting spin valves using a bespoke and first-of-its-kind time-resolved Magnetooptic Kerr effect (tr-MOKE) setup, opening the door to measuring superconducting spintronic characteristics without the need for large-scale facilities.
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