A5009643092- Physics of Superconductivity and Magnetism
- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Topological Materials and Phenomena
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Superconducting Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Iron-based superconductors research
- Nuclear Physics and Applications
- Semiconductor Quantum Structures and Devices
- Superconductivity in MgB2 and Alloys
- Theoretical and Computational Physics
- Advanced Semiconductor Detectors and Materials
- Thin-Film Transistor Technologies
- ZnO doping and properties
- Law, Rights, and Freedoms
- Linguistic Education and Pedagogy
- Legal Systems and Judicial Processes
- Semiconductor materials and devices
- Surface and Thin Film Phenomena
- Image Processing Techniques and Applications
- Syntax, Semantics, Linguistic Variation
- Radical Photochemical Reactions
ARC Centre of Excellence for Engineered Quantum Systems
2020-2023
The University of Sydney
2020-2023
Purdue University West Lafayette
2020
Quantum (Australia)
2020
Microsoft (United States)
2020
University of Leeds
2013-2018
Yale University
2018
Paul Scherrer Institute
2018
United States Naval Research Laboratory
2018
University of Glasgow
2018
The superconductor-ferromagnet proximity effect describes the fast decay of a spin-singlet supercurrent originating from superconductor upon entering neighboring ferromagnet. After placing conical magnet (holmium) at interface between two, we detected long-ranged in ferromagnetic layer. long-range required particular thicknesses spiral magnetically ordered holmium, consistent with spin-triplet theory. This enabled control electron pairing symmetry by tuning degree magnetic inhomogeneity...
Josephson junctions incorporating a conical magnetic spacer layer of Ho were measured as function thickness and an applied field. The characteristic voltage decreased without the obvious presence any $\ensuremath{\pi}$ phase shifts, although decay was somewhat fragmented. is exponential with coherence length ${\ensuremath{\xi}}_{f}\ensuremath{\approx}4.34$ nm mean-free path calculated to be ${l}_{\text{Ho}}=0.28$--$0.87$ nm, which suggests system in dirty limit. dependence junction critical...
In a number of recent experiments, holmium has been shown to promote spin-triplet pairing when in proximity spin-singlet superconductor. The condition for the support is that ferromagnet should have an inhomogeneous magnetic state at interface with Here we use Andreev reflection spectroscopy study properties single ferromagnet/superconductor interfaces formed and niobium, as function contact resistance junction between them. We find both single-crystal $c$-axis-oriented thin-film show...
We investigate the critical temperature Tc of a thin s-wave superconductor (Nb) proximity coupled to helical rare earth ferromagnet (Ho). As function Ho layer thickness, we observe multiple oscillations superimposed on slow decay, that attribute influence Nb effect. Because inhomogeneous magnetization, singlet and triplet pair correlations are present in bilayers. take both into consideration when solving self consistent Bogoliubov-de Gennes equations, reasonable agreement. also non-trivial...
Candidate systems for topologically-protected qubits include two-dimensional electron gases (2DEGs) based on heterostructures exhibiting a strong spin–orbit interaction and superconductivity via the proximity effect. For InAs- or InSb-based materials, need to form shallow quantum wells create hard-gapped p-wave superconducting state often subjects them fabrication-induced damage, limiting their mobility. Here, we examine scattering mechanisms in processed InAs 2DEG demonstrate means of...
We discuss the fabrication of nanopillar spin electronic devices from metal multilayered heterostructures, utilizing a novel three-dimensional focused ion beam lithography process. Finite element simulation was performed to optimize geometry device and demonstrate that current flow is perpendicular plane within active region device. Clear zero-field induced magnetization switching observed in our at room temperature.
Spin–orbit interaction and spin-relaxation mechanisms of a shallow InAs quantum well heterostructure are investigated by magnetoconductance measurements as function an applied top-gate voltage. The data fit using Iordanskii–Lyanda-Geller–Pikus model two distinct transport regimes identified. spin–orbit splitting energy is extracted from the fits to data, which also displays regimes. different exhibit spin-scattering mechanisms, identification relevance for device platforms reduced...
We report the structural and magnetic characterization of sputter deposited epitaxial Ho. present room temperature by atomic force microscopy x-ray diffraction dependent neutron diffraction. The data show onset change state as a function temperature. Films different thickness, exhibiting signs differing epitaxially induced strain, tend towards specific spin-slip phases in low regime. more highly strained thinnest films values with longer wavelength.
Superconducting spintronics in hybrid superconductor/ferromagnet (S-F) heterostructures provides an exciting potential new class of device. The prototypical super-spintronic device is the superconducting spin-valve, where critical temperature, $T_c$, S-layer can be controlled by relative orientation two (or more) F-layers. Here, we show that such control also possible a simple S/F bilayer. Using field history to set remanent magnetic state thin Er layer, demonstrate for Nb/Er bilayer high...
We demonstrate that the magnetic state of a superconducting spin valve, is normally controlled with an external field, can also be manipulated by varying temperature which increases functionality and flexibility such structures as switching elements. In this case, driven changes in magnetostatic energy due to spontaneous Meissner screening currents forming superconductor below critical temperature. Our scanning Hall probe measurements reveal vortex-mediated pinning ferromagnetic domain...
We demonstrate that the critical current of superconducting Nb/Ni multilayers can be continuously tuned by up to a factor three during magnetization reversal Ni films under an applied in-plane magnetic field. Our observations are in reasonably good agreement with model vortex pinning Bloch domain walls proliferate samples reversal, whereby each interacts at most one wall any layers. suggests ways which controllable effect could significantly enhanced, important potential applications...
We characterise the magnetic state of highly-textured, sputter deposited erbium for a film thickness 6 nm. Using polarised neutron reflectometry it is found that has high degree disorder, and we present some evidence film's local consistent with bulk-like spiral magnetism. This, combined complementary characterisation techniques, show thin strong candidate material incorporation into device structures.
Abstract We present a detailed structural and magnetic characterization of sputter deposited thin film erbium, determined by x-ray diffraction, transport measurements, magnetometry neutron diffraction. This provides information on the onset change state as function temperature applied field. Many features bulk material are reproduced. Also interest is identification conical which repeats with wavevector parallel to c axis τ = 4/17 in units reciprocal lattice parameter * , not observed any...
The geometry of magnetic flux penetration in a high temperature superconductor at buried interface was imaged using element-specific x-ray excited luminescence. We performed low observation the YBa2Cu3O7–δ (YBCO) by imaging perpendicular magnetization component square Permalloy (Py) mesostructures patterned superjacent to YBCO film. Element specific below critical reveals cross-like which is decorated regions alternating out-of-plane edges Py structures. cross structure can be attributed...
We combine electron beam lithography and masked anodization of epitaxial aluminium to define tunnel junctions via selective oxidation, alleviating the need for wet-etch processing or direct deposition dielectric materials. Applying this technique Josephson in proximity induced superconducting Al-InAs heterostructures, we observe multiple Andreev reflections transport experiments, indicative a high quality junction. further compare mobility density Hall-bars defined wet etching anodization....
Candidate systems for topologically-protected qubits include two-dimensional electron gases (2DEGs) based on heterostructures exhibiting a strong spin-orbit interaction (SOI) and superconductivity via the proximity effect. For InAs- or InSb-based materials, need to form shallow quantum wells create hard-gapped $p$-wave superconducting state often subjects them fabrication-induced damage, limiting their mobility. Here we examine scattering mechanisms in processed InAs 2DEG demonstrate means...
This article deals with semantically transparent particle verbs in German which contain an incorporated local expression cognate a preposition. In contrast to expressions containing prepositional phrases, the potential reference object of remains systematically unspecified. Regarding data from procedural vantage point, we argue that adequate formulation underlying contextual / conceptual structure requires no referential specification missing - is at most indirectly pragmatically construable...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCommunications- The Effect of Incorporated Cycloalkyl Rings upon the Rearrangement Neophyl-like RadicalsJames Witt and H HoganCite this: J. Org. Chem. 1959, 24, 3, 441–442Publication Date (Print):March 1, 1959Publication History Published online9 July 2003Published inissue 1 March 1959https://pubs.acs.org/doi/10.1021/jo01085a619https://doi.org/10.1021/jo01085a619research-articleACS PublicationsRequest reuse permissionsArticle...