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Insight into the structural and magnetotransport properties of epitaxial α−Fe2O3/Pt(111) heterostructures: Role of the reversed layer sequence

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Physical Review B 2022年第10期106卷 104419-104419页

作者： A. Kozioł-Rachwał N. Kwiatek W. Skowroński K. Grochot J. Kanak E. Madej K. Freindl J. Korecki N. Spiridis Faculty of Physics and Applied Computer Science AGH University of Science and Technology Mickiewicza 30 30-059 Kraków Poland Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences 30-239 Kraków Poland Institute of Electronics AGH University of Science and Technology Mickiewicza 30 30-059 Kraków Poland

We report on the chemical structure and spin Hall magnetoresistance (SMR) in epitaxial α−Fe2O3(hematite)(0001)/Pt(111) bilayers with hematite thicknesses of 6 and 15 nm grown by molecular beam epitaxy on a MgO(111) substrate. Unlike previous studies that involved Pt overlayers on hematite, the present hematite films were grown on a stable Pt buffer layer and displayed structural changes as a function of thickness. These structural differences (the presence of a ferrimagnetic phase in the thinner film) significantly affected the magnetotransport properties of the bilayers. We observed a sign change of the SMR from positive to negative when the thickness of the hematite increased from 6 to 15 nm. For α−Fe2O3(15nm)/Pt, we demonstrated room-temperature switching of the Néel order with rectangular, nondecaying switching characteristics. Such structures open the way to extending magnetotransport studies to more complex systems with double asymmetric metal/hematite/Pt interfaces.

关键词： Magnetic order Magnetotransport Spin Hall magnetoresistance Spintronics Antiferromagnets Epitaxy

Advancing Manuscript Metadata: Work in Progress at the Jagiellonian University

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arXiv 2024年

作者： do Valle Miranda, Luiz Kutt, Krzysztof Nalepa, Grzegorz J. Jagiellonian Human-Centered AI Lab Mark Kac Center for Complex Systems Research Institute of Applied Computer Science Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University prof. Stanislawa Lojasiewicza 11 Kraków30-348 Poland

As part of ongoing research projects, three Jagiellonian University units—the Jagiellonian University Museum, the Jagiellonian University Archives, and the Jagiellonian Library—are collaborating to digitize cultural heritage documents, describe them in detail, and then integrate these descriptions into a linked data cloud. Achieving this goal requires, as a first step, the development of a metadata model that, on the one hand, complies with existing standards, on the other hand, allows interoperability with other systems, and on the third, captures all the elements of description established by the curators of the collections. In this paper, we present a report on the current status of the work, in which we outline the most important requirements for the data model under development and then make a detailed comparison with the two standards that are the most relevant from the point of view of collections: Europeana Data Model used in Europeana and Encoded Archival Description used in Kalliope. Copyright © 2024, The Authors. All rights reserved.

关键词： Metadata

EBSD and TKD analyses using inverted contrast Kikuchi diffraction patterns and alternative measurement geometries

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arXiv 2024年

作者： Cios, Grzegorz Winkelmann, Aimo Nolze, Gert Tokarski, Tomasz Jany, Benedykt R. Bala, Piotr Academic Centre for Materials and Nanotechnology AGH University of Krakow al. A. Mickiewicza 30 Krakow30-059 Poland Unter den Eichen 87 Berlin12205 Germany TU Bergakademie Freiberg Institute for Mineralogy Brennhausgasse 14 Freiberg09596 Germany Marian Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow30348 Poland Faculty of Metals and Industrial Computer Science AGH University of Krakow al. A. Mickiewicza 30 Krakow30-059 Poland

Electron backscatter diffraction (EBSD) patterns can exhibit Kikuchi bands with inverted contrast due to anomalous absorption. This can be observed, for example, on samples with nanoscale topography, in case of a low tilt backscattering geometry, or for transmission Kikuchi diffraction (TKD) on thicker samples. Three examples are discussed where contrast-inverted physics-based simulated master patterns have been applied to find the correct crystal orientation. As first EBSD example, self-assembled gold nanostructures made of Au fcc and Au hcp phases on single-crystal germanium were investigated. Gold covered about 12% of the mapped area, with only two thirds being successfully interpreted using standard Hough-based indexing. The remaining third was solved by brute force indexing using a contrast-inverted master pattern. The second EBSD example deals with maps collected at a non-tilted surface instead of the commonly used 70◦ tilted one. As TKD example, a jet-polished foil made of duplex stainless steel 2205 was examined. The thin part close to the hole edge producing normal-contrast patterns were standard indexed. The areas of the foil that become thicker with increasing distance from the edge of the hole produce contrast-inverted patterns. They covered three times the evaluable area and were successfully processed using the contrast-inverted master pattern. In the last example, inverted patterns collected at a non-tiled sample were mathematically inverted to normal contrast, and Hough/Radon-based indexing was successfully applied. Copyright © 2024, The Authors. All rights reserved.

关键词： Single crystals

Intracellular Uptake of Magnetic Nanocapsules with Ionic Chitosan Shells and Magnetically Triggered Cargo Release

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Nanotechnology, science and Applications 2025年 18卷 263-275页

作者： Elżbieta Gumieniczek-Chłopek Joanna Odrobińska-Bali&sacute Adriana Gilarska Gabriela Opiła Manuel Ricardo Ibarra Czesław Kapusta Szczepan Zapotoczny Faculty of Physics and Applied Computer Science AGH University of Krakow Krakow Poland Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences Krakow Poland Faculty of Chemistry Jagiellonian University Krakow Poland Instituto de Nanociencia Y Materiales de Aragón (INMA) CSIC-Universidad de Zaragoza Laboratorio de Microscopías Avanzadas (LMA) Universidad de Zaragoza Zaragoza Spain

IntroductionDrug delivery systems typically need to be equipped with targeting moieties in order to be efficiently internalized by cells. Alternatively, magnetic nanoparticles (MNs) combined with active compounds may be driven by magnetic field to the site of action. Delivery of hydrophobic drugs using this approach is challenging as it would require coupling of MNs and hydrophobic environment within nanocarriers and triggering of the drug *** propose an approach enabling a magnetically induced forced uptake of core-shell nanocapsules carrying hydrophobic actives together with hydrophobized MNs. Such capsules, formed in a facile emulsification process, are composed of amphiphilic cationic or anionic chitosan (shell) and oil-dispersible MNs (oil core). The capsules were characterized using DLS, cryo-TEM. They were loaded with a model fluorescent dye, Nile Red, and pulled into cells applying a static magnetic field. Then, they were treated with an alternating magnetic field to disrupt the capsules thanks to the action of ***-TEM imaging confirmed the presence of MNs inside the capsules (d≈200 nm). Confocal microscopy imaging showed the efficient capsules’ intracellular uptake only after exposition to static magnetic field (some spontaneous uptake was observed for anionic capsules). Then, application of alternating magnetic fields induced rapture of the capsules inside the cells and release of the *** approach is very versatile as various lipophilic compounds could be encapsulated, then transported to desired tissues without active or passive targeting and kept there using static magnetic field, limiting undesired side effects of a therapy to the whole organism. The proposed capsules with MNs respond efficiently to magnetic field stimulation – they can be magnetically navigated into the cells and release their cargo after application of alternating magnetic field. This approach opens opportunities for controlled intracellular

关键词： magnetic nanoparticles drug delivery systems nanocarriers nanomedicine iron oxide nanoparticles polymer capsules

Higher order cumulants of transverse momentum and harmonic flow in relativistic heavy ion collisions

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Physical Review C 2021年第1期104卷 014905-014905页

作者： Piotr Bożek Rupam Samanta Faculty of Physics and Applied Computer Science AGH University of Science and Technology aleja Mickiewicza 30 30-059 Cracow Poland

Higher order symmetric cumulants of global collective observables in heavy ion collisions are studied. The symmetric cumulants can be straightforwardly constructed for scalar observables: the average transverse momentum, the multiplicity, and the squares of harmonic flow vectors. Third and fourth order cumulants are calculated in the hydrodynamic model. A linear predictor of the average transverse momentum and harmonic flow coefficients in a collision is used to predict the values of the cumulants from the moments of the initial distribution. The symmetric cumulants divided by the averages (or the standard deviations) of the considered observables can be used as a fine tool to study correlations present in the initial state of the collision.

关键词： Collective flow Particle correlations & fluctuations Relativistic heavy-ion collisions

Measurement sharpness and disturbance tradeoff

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arXiv 2023年

作者： Saberian, Nayere Akhtarshenas, Seyed Javad Shahbeigi, Fereshte Department of Physics Ferdowsi University of Mashhad Mashhad Iran Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow30-348 Poland

Obtaining information from a quantum system through a measurement typically disturbs its state. The postmeasurement states for a given measurement, however, are not unique and highly rely on the chosen measurement model, complicating the puzzle of information-disturbance. Two distinct questions are then in order. Firstly, what is the minimum disturbance a measurement may induce? Secondly, when a fixed disturbance occurs, how informative is the possible measurement in the best-case scenario? Here, we propose various approaches to tackle these questions and provide explicit solutions for the set of unbiased binary qubit measurements and postmeasurement state spaces that are equivalent to the image of a unital qubit channel. In particular, we show there are different tradeoff relations between the sharpness of this measurement and the average fidelity of the premeasurement and postmeasurement state spaces as well as the sharpness and quantum resources preserved in the postmeasurement states in terms of coherence and discord-like correlation once the measurement is applied locally. Copyright © 2023, The Authors. All rights reserved.

关键词： Qubits

Bell inequalities with overlapping measurements

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arXiv 2023年

作者： Morán, Moisés Bermejo Pozas-Kerstjens, Alejandro Huber, Felix Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics Jagiellonian University Kraków30-348 Poland Madrid28049 Spain

Which nonlocal correlations can be obtained, when a party has access to more than one subsystem? While traditionally nonlocality deals with spacelike separated parties, this question becomes important with quantum technologies that connect devices by means of small shared systems. Here we study Bell inequalities where measurements of different parties can have overlap. This allows to accommodate problems in quantum information such as the existence of quantum error correction codes in the framework of non-locality. The scenarios considered show an interesting behaviour with respect to Hilbert space dimension, overlap, and symmetry. Copyright © 2023, The Authors. All rights reserved.

关键词： Quantum optics

Quantification of Elemental Composition of the Thin Tissue Slices with the Commercial Benchtop Micro-Xrf Spectrometer

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SSRN

SSRN 2024年

作者： Wróbel, Pawel Stec, Patryk Wiatrowska, Wiktoria Ziomber-Lisiak, Agata Szczerbowska-Boruchowska, Magdalena Faculty of Physics and Applied Computer Sciences AGH University of Krakow al. Mickiewicza 30 Krakow30-059 Poland Chair of Pathophysiology Faculty of Medicine Jagiellonian University Medical College ul. Czysta 18 Krakow31-121 Poland

In this paper we present the scheme for quantification of local elemental composition by micro-XRF in thin tissue slices. The proposed procedure involves simultaneous determination of the geometry factor and the primary spectrum distribution from the measurement of set of the thin film calibrations standards. The procedure has been applied for the commercial M4 Tornado Plus spectrometer by Bruker. The quantification of the thin tissue slice has been performed as well. © 2024, The Authors. All rights reserved.

关键词： Spectrometers

Gain layer degradation study after neutron and proton irradiations in Low Gain Avalanche Diodes

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arXiv 2023年

作者： Rivera, Esteban Currás Rosa, Alessandro La Moll, Michael Zareef, Fasih CERN Organisation Europénne Pour La Recherche Nucléaire Genéve 23 CH-1211 Switzerland Faculty of Physics and Applied Computer Science AGH University of Science and Technology al. Mickiewicza 30 Krakow30-059 Poland

The high-luminosity upgrade of the ATLAS and CMS experiments includes dedicated sub-detectors to perform the time-stamping of minimum ionizing particles (MIPs). These detectors will be exposed up to fluences in the range of 1.5 − 2.5 × 1015 neq/cm2 at the end of their lifetime and, Low Gain Avalanche Diode (LGAD) has been chosen as their baseline detection technology. To better understand the performance of LGAD detectors in these environments, a gain layer degradation study after neutron and proton irradiations up to a fluence of 1.5 × 1015 neq/cm2 was performed. LGADs manufactured at Hamamatsu Photonics (HPK) and Centro Nacional de Microelectrónica (CNM-IMB) were chosen for this study and, a comparison in the gain layer degradation after exposure to reactor neutrons at the Jožef Stefan Institute (JSI) in Ljubjana and 24 GeV/c protons at the CERN-PS is presented here. © 2023, CC BY-NC-ND.

关键词： Proton irradiation