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Showing 1 to 17 of 17 for “"X-ray magnetic circular dichroism"”.
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Studies in Magnetism and Superconductivity under Extreme Pressure
… create new superconductors, change the magnetic state of a material, and induce structural transitions. In Eu metal the strong local-moment magnetism in divalent Eu: 4f<super>7</super>) suppresses superconductivity. Under sufficiently high pressure, Eu is expected to become trivalent and …
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Magnetic structures and proximity effects in rare-earth / transition metal ferromagnetic and superconductor systems
The antiferromagnetic coupling between a rare-earth (RE) and a tran- sition metal (TM) ferromagnet can be exploited to engineer normal state and superconducting functional devices. RE/TM ferromagnetic multi- layers were previously used as spin-mixers to generate spin-triplet su- percurrents. This …
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Half-metallic CrO_2 thin films for spintronic applications
… TiO_2 substrates investigated using X$ - $ray diffraction. Superconducting quantum interference device (SQUID) and element specific X-ray magnetic circular dichroism (XMCD) techniques were employed to investigate the effect of this substrate-induced strain on the magnetic properties of the …
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Μελέτη της σχέσης δομής-μαγνητισμού σε λεπτά υμένια με ακτινοβολία σύγχροτρον και με συμβατικές πειραματικές τεχνικές
… του κυκλικού μαγνητικού διχρωϊσμού ακτίνων Χ (x-ray magnetic circular dichroism – XMCD) άμορφα και κρυσταλλικά υμένια με παρόμοια σύνθεση. Αφενός, για πρώτη φορά μετρήθηκε η επαγόμενη μαγνητική ροπή στο ζιρκόνιο και το ύττριο σε άμορφα και κρυσταλλικά μαγνητικά υμένια και διαχωρίστηκαν οι …
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Defect-induced magnetism and transport phenomena in epitaxial oxides
… films. In the first part, the origin of the ferromagnetic properties of Mn-doped and undoped zinc oxide is studied. The deposition conditions are found to have a significant impact on the structural, transport and magnetic properties of the thin films. Combining x-ray magnetic circular dichroism …
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Spin transport in few-layer graphene
… spin transport and spin detection, using magnetic electrodes and single/multilayer graphene. Although it has been very actively researched since 2006, there is still disagreement regarding the spin diffusion length (lsf). This is partially because insufficient attention has been paid to …
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Diluted Magnetic Semiconductor Cobalt and Europium Implanted ZnO Thin Film
Diluted magnetic semiconductors (DMSs) have initiated enormous scientific interests because of their potential for multifunctional spintronics devices. ZnO based semiconductors have been identified to be the promising room temperature ferromagnetic materials with a wide band-gap. However, the …
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Heteroepitaxial Interfaces Modify Collective States in Complex Oxides
… imbalance on electronic transport and magnetic order were discussed under the formalism of the double exchange interaction. By constructing DSLs with LaMnO3, SrMnO3 and CaMnO3, electronic properties in ordered pseudo alloys having average doping, x=⅓ was compared with random alloy …
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Magnetoelectric Properties of Epitaxial Spinel Oxide Thin Films
… thin films on perovskite SrTiO3 substrates. The magnetic and electrical properties of FVO films are presented as well as the characterization of magnetoelectric coupling of the material. Secondly, another unique spinel, Cobalt Chromite, CoCr2O4 (CCO), which has a canted conical magnetic ordering …
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Element-resolved ultrafast magnetization dynamics in ferromagnetic alloys and multilayers
… the quenching of the magnetization of a ferromagnetic metal on a sub-picosecond timescale after laser excitation, is still only incompletely understood, despite a large body of experimental and theoretical work performed since the discovery of the effect more than 15 years ago. Time- and …
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Fundamental magnetic properties of Greigite (Fe3S4)
… twenty years, greigite (Fe3S4), an authigenic magnetic iron sulphide mineral, has been increasingly identified in sulphate-reducing marine and lacustrine sedimentary systems. Its presence can significantly affect palaeomagnetic and environmental magnetic records. Understanding the recording …
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Tiny Space Magnets: X-ray Microscopy and Nanopaleomagnetism of Meteoritic Metal
… is the presence or absence of a dynamo-driven magnetic field. These observations provide essential constraints on the degree of differentiation, core solidification timescales and the driving forces for convection. This thesis focusses on the paleomagnetic information recorded by iron and …
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Spintronics Physics of Thin-film Interfaces
Magnetic heterostructures may exhibit new features at the interface while leaving the bulk properties of the films unaltered, which make them ideal for technological applications. Here, I explore the interfaces of EuO(001)/LaAlO$_3$(001), EuO/NiO(111) and graphene/metal heterostructures. Published …
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Ultrafast magnetization dynamics of lanthanide metals and alloys
… using femtosecond (fs) time-resolved x-ray magnetic circular dichroism (XMCD), the magneto-optical Kerr effect (MOKE) and magnetic second harmonic generation (MSHG). The magnetization dynamics is analyzed from the time scale of a few fs up to several hundred picoseconds (ps). The …
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Peculiarities of crystal and magnetic structures of synthetic Co-olivine, Co 2 SiO 4
… there is still a lack of information on the magnetic properties and the thermal evolution of the crystal structure below room temperature for some olivines. One of the less studied olivine-type silicates is the synthetic cobalt olivine, Co2SiO4. The main goal of the present study is to …
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Investigation of spin-caloric and spin-orbit torque materials by vectorial spin Seebeck measurements and an advanced x-ray magnetic reflectivity analysis
… decade there has been considerable interest in magnetic Heusler compounds in the field of spintronics based on their wide range of magnetic properties and susceptibility to manipulation by elemental substitution. In particular half-Heusler alloys are currently attracting growing attention due to …
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Optically induced ferro- and antiferromagnetic dynamics in the rare-earth metal dysprosium
… physical limits in speed and size of today's magnetic storage and processing technologies demands new concepts for controlling magnetization and moves researches on optically induced magnetic dynamics. Studies on photoinduced magnetization dynamics and their underlying mechanisms have been …