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Sökning: WFRF:(Arvanitis D)

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1.
  • Buchanan, E. M., et al. (författare)
  • The Psychological Science Accelerator's COVID-19 rapid-response dataset
  • 2023
  • Ingår i: Scientific Data. - : Springer Science and Business Media LLC. - 2052-4463. ; 10:1
  • Tidskriftsartikel (refereegranskat)abstract
    • In response to the COVID-19 pandemic, the Psychological Science Accelerator coordinated three large-scale psychological studies to examine the effects of loss-gain framing, cognitive reappraisals, and autonomy framing manipulations on behavioral intentions and affective measures. The data collected (April to October 2020) included specific measures for each experimental study, a general questionnaire examining health prevention behaviors and COVID-19 experience, geographical and cultural context characterization, and demographic information for each participant. Each participant started the study with the same general questions and then was randomized to complete either one longer experiment or two shorter experiments. Data were provided by 73,223 participants with varying completion rates. Participants completed the survey from 111 geopolitical regions in 44 unique languages/dialects. The anonymized dataset described here is provided in both raw and processed formats to facilitate re-use and further analyses. The dataset offers secondary analytic opportunities to explore coping, framing, and self-determination across a diverse, global sample obtained at the onset of the COVID-19 pandemic, which can be merged with other time-sampled or geographic data.
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7.
  • Arvanitis, D, et al. (författare)
  • Adsorbate substrate bonding and dynamics as determined by SEXAFS
  • 1995
  • Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. ; 75, s. 149-159
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • A review is given of surface extended X-ray absorption fine structure (SEXAFS) data taken at the N and O K-edges of atomic and molecular adsorbates on Cu and Ni surfaces. The theory of the dynamic analysis of SEXAFS data is briefly presented. We conclude
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8.
  • Arvanitis, D, et al. (författare)
  • Magnetic X-ray circular dichroism on in situ grown 3d magnetic thin films on surfaces
  • 2001
  • Ingår i: JOURNAL OF SYNCHROTRON RADIATION. - : MUNKSGAARD INT PUBL LTD. - 0909-0495. ; 8, s. 120-124
  • Tidskriftsartikel (refereegranskat)abstract
    • Epitaxic thin and ultrathin films on surfaces allow crystallographic phases that do not occur naturally in the bulk to be stabilized. They also offer new possibilities for an improved understanding of soft X-ray photoabsorption in magnetic systems. Data c
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9.
  • ARVANITIS, D, et al. (författare)
  • PAIR POTENTIALS IN THE SEXAFS ANALYSIS
  • 1995
  • Ingår i: PHYSICA B. - : ELSEVIER SCIENCE BV. - 0921-4526. ; 209:1-4, s. 431-435
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • An overview for a dynamical SEXAFS analysis for several systems is presented in terms of effective pair potentials. Model potentials of Madelung type are found to describe well the adsorption of N, O, O-2 on Cu and Ni metal surfaces. The potential paramet
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10.
  • Arvanitis, D, et al. (författare)
  • Shape resonances of oriented molecules
  • 2000
  • Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. - 0368-2048. ; 113:1, s. 57-65
  • Tidskriftsartikel (refereegranskat)abstract
    • We report ab initio calculations of the X-ray absorption cross section for the near edge X-ray absorption fine structure of C2H6, C2H4 and C2H2, at the carbon K-edge, based on a full multiple scattering formalism. We find that shape resonances dominate th
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11.
  • ASPELMEIER, A, et al. (författare)
  • AC SUSCEPTIBILITY MEASUREMENTS OF MAGNETIC MONOLAYERS - MCXD, MOKE, AND MUTUAL INDUCTANCE
  • 1995
  • Ingår i: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 146:3, s. 256-266
  • Tidskriftsartikel (refereegranskat)abstract
    • A refined analysis of dispersive and absorptive contributions to the complex magnetic susceptibility yields detailed information on magnetic and structural properties of ultrathin films. The new ac modulated magnetic circular X-ray dichroism (MCXD) techni
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12.
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13.
  • Bruhwiler, P, et al. (författare)
  • Vibronic coupling in the photoemission bands of condensed C-60
  • 1997
  • Ingår i: CHEMICAL PHYSICS LETTERS. - : ELSEVIER SCIENCE BV. - 0009-2614. ; 279:1-2, s. 85-91
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We present photoelectron spectra for the highest occupied molecular orbital (HOMO) of C-60 in the gas phase and a two-dimensional (2D) condensed layer. For low temperatures the similarity in the spectra is striking and places a strict upper limit of 0.07
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14.
  • Ceballos, G, et al. (författare)
  • High-resolution X-ray absorption spectra of the pi* resonance of N-2 directly physisorbed on Cu(100)
  • 2001
  • Ingår i: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT. - : ELSEVIER SCIENCE BV. - 0168-9002. ; 467, s. 1560-1563
  • Tidskriftsartikel (refereegranskat)abstract
    • High-resolution NEXAFS spectra of the pi* resonance of N-2 molecules directly physisorbed on a Cu(100) surface are reported. The vibrational fine structure of this resonance, even for very low coverages, could be resolved, allowing the performance of a vi
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15.
  • Ceballos, G, et al. (författare)
  • Molecular geometry modifications upon adsorption for N2O: N and O K-edge NEXAFS
  • 2001
  • Ingår i: SURFACE SCIENCE. - : ELSEVIER SCIENCE BV. - 0039-6028. ; 482, s. 15-20
  • Tidskriftsartikel (refereegranskat)abstract
    • The interaction of a monolayer and submonolayer N2O with the Cu(100) and Ag(110) surfaces has been studied using near-edge X-ray absorption fine structure spectroscopy. From a detailed analysis of the angular dependent intensity of the molecular resonance
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16.
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17.
  • Davila, ME, et al. (författare)
  • Magnetic circular X-ray dichroism of metastable epitaxial Fe on Cu(100)
  • 1999
  • Ingår i: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 197, s. 120-122
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We report L-edge Magnetic Circular X-Ray Dichroism measurements at 30 K of Fe deposited at 100 K on Cu (1 0 0) in the form of ultrathin films and a wedge. The orbital and spin moments of the wedge differ from those obtained for uniform thickness films. Fo
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18.
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19.
  • Delaney, BC, et al. (författare)
  • Translational Medicine and Patient Safety in Europe: TRANSFoRm--Architecture for the Learning Health System in Europe
  • 2015
  • Ingår i: BioMed research international. - : Hindawi Limited. - 2314-6141 .- 2314-6133. ; 2015, s. 961526-
  • Tidskriftsartikel (refereegranskat)abstract
    • The Learning Health System (LHS) describes linking routine healthcare systems directly with both research translation and knowledge translation as an extension of the evidence-based medicine paradigm, taking advantage of the ubiquitous use of electronic health record (EHR) systems. TRANSFoRm is an EU FP7 project that seeks to develop an infrastructure for the LHS in European primary care.Methods. The project is based on three clinical use cases, a genotype-phenotype study in diabetes, a randomised controlled trial with gastroesophageal reflux disease, and a diagnostic decision support system for chest pain, abdominal pain, and shortness of breath.Results. Four models were developed (clinical research, clinical data, provenance, and diagnosis) that form the basis of the projects approach to interoperability. These models are maintained as ontologies with binding of terms to define precise data elements. CDISC ODM and SDM standards are extended using an archetype approach to enable a two-level model of individual data elements, representing both research content and clinical content. Separate configurations of the TRANSFoRm tools serve each use case.Conclusions.The project has been successful in using ontologies and archetypes to develop a highly flexible solution to the problem of heterogeneity of data sources presented by the LHS.
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21.
  • Dunn, JH, et al. (författare)
  • In situ MCD magnetometry in the ultrathin limit: Fe on Cu(100)
  • 1997
  • Ingår i: JOURNAL DE PHYSIQUE IV. - : EDITIONS PHYSIQUE. - 1155-4339. ; 7:C2, s. 383-387
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • By means of Magnetic Circular Dichroism in X-ray Absorption Spectroscopy we investigated the magnetic properties of fct Fe films stabilised by epitaxial growth on the Cu(100) surface. These are compared to bcc like Fe films. The films were characterised i
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22.
  • Dunn, JH, et al. (författare)
  • Influence of source coherence on X-ray absorption spectroscopy
  • 2000
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 84:5, s. 1031-1034
  • Tidskriftsartikel (refereegranskat)abstract
    • Core-level x-ray absorption spectroscopy measurements have bean performed at the L-3,L-2 edges of Fe and Co thin films. The degree of source coherence was varied using soft x rays from five different beam lines. We observe an increase of the L edge resona
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23.
  • Dunn, JH, et al. (författare)
  • Linear magnetic dichroism of thin Fe films on Cu(100)
  • 1999
  • Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. - 0368-2048. ; 103, s. 463-466
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • A series of XPS measurements have been performed on the Fe/Cu(100) system. Using linearly polarised X-rays from an undulator source, magnetic information is evident in the spectra when the magnetisation direction is reversed. These measurements show that
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24.
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25.
  • Dunn, JH, et al. (författare)
  • Magnetisation reorientation in ultra-thin Fe films on Cu(100) upon deposition of Co
  • 2001
  • Ingår i: JOURNAL OF SYNCHROTRON RADIATION. - : MUNKSGAARD INT PUBL LTD. - 0909-0495. ; 8, s. 463-465
  • Tidskriftsartikel (refereegranskat)abstract
    • Ultra thin films of Fe deposited on the (100) surface of a Cu single crystal exhibit a net perpendicular magnetic anisotropy. The addition of very low coverages of Co results in the easy magnetic direction reorienting into the film plane. This behavior is
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26.
  • Dunn, JH, et al. (författare)
  • Magnetism of thin Fe films on Cu(100)
  • 1996
  • Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. - 0163-1829. ; 54:16, s. 11157-11160
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Magnetic moments have been determined for the fct and bce structural phases of Fe, stabilized on the (100) surface of Cu, from magnetic-circular-dichroism measurements. For the thin fct films, the spin and orbital moments are greatly increased to 3.4(7)mu
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27.
  • Gill, Dipender, et al. (författare)
  • ACE inhibition and cardiometabolic risk factors, lung ACE2 and TMPRSS2 gene expression, and plasma ACE2 levels : a Mendelian randomization study
  • 2020
  • Ingår i: Royal Society Open Science. - : ROYAL SOC. - 2054-5703. ; 7:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Angiotensin-converting enzyme 2 (ACE2) and serine protease TMPRSS2 have been implicated in cell entry for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus responsible for coronavirus disease 2019 (COVID-19). The expression of ACE2 and TMPRSS2 in the lung epithelium might have implications for the risk of SARS-CoV-2 infection and severity of COVID-19. We use human genetic variants that proxy angiotensin-converting enzyme (ACE) inhibitor drug effects and cardiovascular risk factors to investigate whether these exposures affect lung ACE2 and TMPRSS2 gene expression and circulating ACE2 levels. We observed no consistent evidence of an association of genetically predicted serum ACE levels with any of our outcomes. There was weak evidence for an association of genetically predicted serum ACE levels with ACE2 gene expression in the Lung eQTL Consortium (p = 0.014), but this finding did not replicate. There was evidence of a positive association of genetic liability to type 2 diabetes mellitus with lung ACE2 gene expression in the Gene-Tissue Expression (GTEx) study (p = 4 x 10(-4)) and with circulating plasma ACE2 levels in the INTERVAL study (p = 0.03), but not with lung ACE2 expression in the Lung eQTL Consortium study (p = 0.68). There were no associations of genetically proxied liability to the other cardiometabolic traits with any outcome. This study does not provide consistent evidence to support an effect of serum ACE levels (as a proxy for ACE inhibitors) or cardiometabolic risk factors on lung ACE2 and TMPRSS2 expression or plasma ACE2 levels.
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28.
  • Gridneva, Lidia, et al. (författare)
  • Experimental investigation of the spin reorientation of Co/Au based magnetic nanodot arrays
  • 2008
  • Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121 .- 1550-235X. ; 77:10
  • Tidskriftsartikel (refereegranskat)abstract
    • (Co/Au) and (Au/ Co/ Au) nanomagnet arrays grown on nanostructured self-organized SiGe templates have been characterized by means of x-ray photoemission electron microscopy, x-ray magnetic circular dichroism, and by extended x-ray absorption spectroscopy using synchrotron radiation. In-plane magnetization is observed at room temperature for practically all Co thicknesses, a stable macroscopic perpendicular magnetic order only at low temperature. The spin reorientation transition in these dot arrays takes place for smaller Co thicknesses over a broader thickness range than in two-dimensional systems. This finding appears to be related with structural relaxation modifications, occurring within the local Co atom environment, which are not necessarily connected with the orbital moment variations. These variations appear in the form of a systematic increase, correlated with the existence of out-of-plane magnetization.
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29.
  • Haack, N, et al. (författare)
  • Shape resonances of oriented molecules: ab initio theory and experiment on hydrocarbon molecules
  • 2000
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 84:4, s. 614-617
  • Tidskriftsartikel (refereegranskat)abstract
    • We report ab initio calculations of the x-ray absorption cross section for the near edge x-ray absorption fine structure of C2H6, and C2H4, and C2H2 at the C K-edge, based on a full multiple scattering formalism. The angular dependence of the electric dip
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30.
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31.
  • Hahlin, A, et al. (författare)
  • Ultrathin Co films on flat and stepped Cu(111) surfaces: Determination of per atom orbital and spin moments
  • 2002
  • Ingår i: Applied Physics Reviews. - : AIP Publishing. - 1931-9401. ; 91:10, s. 6881-6883
  • Tidskriftsartikel (refereegranskat)abstract
    • We have used the x-ray magnetic circular dichroism technique to characterize ultrathin Co films deposited on flat and vicinal Cu(111) single crystal surfaces. All films were prepared and characterized in situ, in ultrahigh vacuum. Similar to other investigators we report a 40% increase of the ratio m(l)/m(s) (orbital to spin moment) of ultrathin Co on both flat and vicinal Cu(111). In addition, an apparently correlated enhancement of both the orbital and spin moments is observed for Co on vicinal Cu(111). This finding is in contrast to what has earlier been reported for a similar system, Co on vicinal Cu(100). (C) 2002 American Institute of Physics.
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32.
  • Hahlin, A, et al. (författare)
  • Ultrathin Co films on flat and vicinal Cu(111) surfaces: per atom determination of orbital and spin moments
  • 2003
  • Ingår i: Journal of Physics: Condensed Matter. - : IOP Publishing. - 0953-8984. ; 15:5, s. 573-586
  • Konferensbidrag (refereegranskat)abstract
    • We have performed x-ray magnetic circular dichroism, x-ray resonant magnetic scattering and scanning tunnelling microscopy measurements on ultrathin Co films deposited on flat and vicinal Cu(111). The range of film thickness varies between one and 25 monolayers. For the vicinal Cu(111), Co deposition below one monolayer leads to the formation of elongated islands preferentially oriented along the step edges. These islands extend over lateral length scales of up to several thousand angstroms. For the thicker films we still observe that the vicinal surface leads to the occurrence of a preferential uniaxial growth direction. No such preferential growth direction can be identified for the flat surface. In correlation to the Co growth we observe an increase of both the orbital and the spin moment per Co atom on vicinal Cu(111) of about 25% versus what was observed for Co on flat Cu(111). This enhancement is observed in both the x-ray absorption and the reflectivity measurements. Similar to what was earlier reported for Co on Cu(100) we also observe for the case Co on Cu(111) an increase in the ratio m(l)/m(s), (orbital to spin moments) of 40% for thin Co films. In contrast to what has been reported for Co films on flat and vicinal Cu(100) we do not observe any major variations in the occupancy of the Co 3d states for Co grown on the vicinal Cu(111) surface.
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33.
  • Kowalik, I. A., et al. (författare)
  • Element-specific characterization of heterogeneous magnetism in (Ga,Fe)N films
  • 2012
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 85:18, s. 184411-
  • Tidskriftsartikel (refereegranskat)abstract
    • We employ x-ray spectroscopy to characterize the distribution and magnetism of particular alloy constituents in (Ga,Fe)N films grown by metal organic vapor phase epitaxy. Furthermore, photoelectron microscopy gives direct evidence for the aggregation of Fe ions, leading to the formation of Fe-rich nanoregions adjacent to the samples surface. A sizable x-ray magnetic circular dichroism (XMCD) signal at the Fe L edges in remanence and at moderate magnetic fields at 300 K links the high-temperature ferromagnetism with the Fe(3d) states. A sizable value of the orbital moment measured in remanence points to a large magnetic anisotropy and to a correspondingly high blocking temperature, which can stabilize the ferromagnetic-like response of the Fe-rich nanocrystals at 300 K. The XMCD response at the N K edge highlights that the N(2p) states, due to exchange coupling to Fe ions, carry considerable spin polarization. These results, supported by ab initio studies of XMCD spectra for various FeN delta nanocrystals, demonstrate that nanocrystals with delta > 0.25 account for the ferromagnetic behavior of (Ga,Fe)N films.
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34.
  • Lemke, L, et al. (författare)
  • Magnetic extended x-ray absorption fine structure at the L-3,L-2 edges of 3d elements
  • 1998
  • Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 10:8, s. 1917-1930
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We report normal and magnetic extended x-ray absorption fine-structure (EXAFS) measurements made on 30 ML Fe films on Cu(001) substrates at the L-3,L-2 edges. The magnetic EXAFS at the L edges of 3d metals is particularly important as it can be used to pr
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35.
  • Maxwell, AJ, et al. (författare)
  • C 1s ionisation potential and energy referencing for solid C-60 films on metal surfaces
  • 1996
  • Ingår i: CHEMICAL PHYSICS LETTERS. - : ELSEVIER SCIENCE BV. - 0009-2614. ; 260:1-2, s. 71-77
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We present a measurement of the C Is ionisation potential (IP) for solid C-60, as well as a reliable determination of the highest occupied molecular orbital (HOMO) IP. The difference between the gas phase and solid state measurements for the HOMO agrees w
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36.
  • MAXWELL, AJ, et al. (författare)
  • C-60 ON AL(111) - COVALENT BONDING AND SURFACE RECONSTRUCTION
  • 1995
  • Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. ; 52:8
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • We present photoemission and C 1s photoabsorption data for an annealed monolayer C-60/Al(111), which show that a strong covalent bond is formed between the C-60 molecules and the substrate. Low-energy electron-diffraction and scanning tunneling microscopy
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37.
  • Maxwell, AJ, et al. (författare)
  • Electronic and geometric structure of C-60 on Al(111) and Al(110)
  • 1998
  • Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMERICAN PHYSICAL SOC. - 0163-1829. ; 57:12, s. 7312-7326
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Two new ordered monolayer phases of C-60 on Al surfaces have been studied using electron spectroscopies and low-energy electron diffraction (LEED). On Al(111), in addition to the previously reported (6x6) phase formed by evaporating with T-sample=620 K, a
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38.
  • Maxwell, AJ, et al. (författare)
  • Length scales in core level excitation: C 1s x-ray absorption of C-60/Al
  • 1997
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMER INST PHYSICS. - 0031-9007. ; 79:8, s. 1567-1570
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We present evidence for atomic site-dependent excitonic effects in the x-ray absorption spectrum of an ordered chemisorbed monolayer of C-60/Al(110). We observe that the broadening in the 5t(1u)-derived resonance and the corresponding core level resonant
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39.
  • MAY, F, et al. (författare)
  • AN ANGLE-DEPENDENT MAGNETIC CIRCULAR X-RAY DICHROISM STUDY OF CO/CU(100) - EXPERIMENT VERSUS THEORY
  • 1995
  • Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 7:6, s. 1111-1119
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Values for the magnetic moments of 3d transition metals have been calculated from magnetic circular x-ray dichroism measurements using sum rules. In this work we reveal that these calculations are sensitive to a damping effect resulting from a decrease in
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40.
  • May, F, et al. (författare)
  • Magnetic coupling of Ni, Cu and Co bi- and trilayers probed by magnetic circular X-ray dichroism
  • 1997
  • Ingår i: JOURNAL DE PHYSIQUE IV. - : EDITIONS PHYSIQUE. - 1155-4339. ; 7:C2, s. 389-395
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Using magnetic circular X-ray dichroism (MCXD), Co/Ni, Cu/Co and Cu/Ni bilayers and Co/Cu/Ni and Ni/Cu/Co trilayers grown on a Cu(001) substrate were investigated. The Co layers were about 2 monolayers (Mi,) and the Ni layers were between 1.5 and 4.5 ML t
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41.
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42.
  • Racka, K., et al. (författare)
  • Growth of SiC by PVT method in the presence of cerium dopant
  • 2013
  • Ingår i: Journal of Crystal Growth. - : Elsevier BV. - 0022-0248 .- 1873-5002. ; 377, s. 88-95
  • Tidskriftsartikel (refereegranskat)abstract
    • The effect of the presence of CeO2 in the source material on the properties of SiC crystals grown by Physical Vapor Transport (PVT) method is investigated. The doping efficiency and, indirectly, the presence of the cerium vapour in the growth atmosphere were examined by study of structural, electrical and optical properties of the crystals. X-ray photoelectron spectroscopy shows that Ce2O3 and CeO2 coexist on the SiC post-growth surfaces. A detectable Ce incorporation is observed only in the last grown part of the crystal. 
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43.
  • Removic-Langer, K, et al. (författare)
  • Spin and orbital moments in Au/Co/Au(111)/W(110) across the spin-reorientation transition-temperature
  • 2003
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 200, s. 210-214
  • Tidskriftsartikel (refereegranskat)abstract
    • The temperature-driven spin-reorientation transition (SRT) has been investigated in a layer of 2.1 nm Co in Au/Co/Au. We studied the evolution and stability of the in-plane magnetization components in the temperature range from 300 to 90 K by means of polarized neutron reflectometry (PNR) and Co L-edge X-ray magnetic circular dichroism (XMCD) measurements. The PNR measurement provides evidence for the occurrence of a SRT in this temperature range. XMCD can be used as a vector magnetometer that yields both the in- and out-of-plane magnetization components per Co atom. Combining the results of both techniques (PNR and XMCD) allows separating the orbital and spin magnetic moments using magneto-optical sum rules. We observed that already above the SRT the in-plane orbital moment component changes significantly stronger than the spin component. (C) 2002 Elsevier Science B.V. All rights reserved.
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44.
  • Sawicki, M., et al. (författare)
  • Homogeneous and heterogeneous magnetism in (Zn,Co)O : From a random antiferromagnet to a dipolar superferromagnet by changing the growth temperature
  • 2013
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 88:8
  • Tidskriftsartikel (refereegranskat)abstract
    • A series of (Zn,Co)O layers with Co contents x up to 40% grown by atomic layer deposition have been investigated. All structures deposited at 160 degrees C show magnetic properties specific to II-VI dilute magnetic semiconductors with localized spins S = 3/2 coupled by strong but short-range antiferromagnetic interactions resulting in low-temperature spin-glass freezing for x = 0.16 and 0.4. At higher growth temperature (200 degrees C) metallic Co nanocrystals precipitate in two locations giving rise to two different magnetic responses: (i) a superparamagnetic contribution coming from volume disperse nanocrystals; (ii) a ferromagneticlike behavior brought about by nanocrystals residing at the (Zn,Co)O/substrate interface. It is shown that the dipolar coupling within the interfacial two-dimensional dense dispersion of nanocrystals is responsible for the ferromagneticlike behavior.
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45.
  • Srivastava, P, et al. (författare)
  • Magnetic extended x-ray absorption fine structure at the L-3,L-2 edges of Fe and Co on Cu(001)
  • 1998
  • Ingår i: JOURNAL OF APPLIED PHYSICS. - : AMER INST PHYSICS. - 0021-8979. ; 83:11, s. 7025-7027
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We report magnetic extended x-ray absorption fine structure (EXAFS) measurements on 30 monolayer Fe and Co films on Cu(001) substrates at L-3,L-2 edges. For 3d transition metals, the magnetic EXAFS at the L edges is of great interest since it probes final
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46.
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47.
  • TISCHER, M, et al. (författare)
  • ENHANCEMENT OF ORBITAL MAGNETISM AT SURFACES - CO ON CU(100)
  • 1995
  • Ingår i: PHYSICAL REVIEW LETTERS. - : AMER INST PHYSICS. - 0031-9007. ; 75:8, s. 1602-1605
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • By combining magnetic circular x-ray dichroism experiments with first principles electronic structure calculations, we demonstrate that the orbital contribution to magnetism can be strongly enhanced at surfaces. This effect is illustrated for Co grown on
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48.
  • TISCHER, M, et al. (författare)
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    • We report magnetic circular X-ray dichroism (MCXD) measurements of ultrathin Ni films grown on Cu(?OO). The Curie temperature of the films is determined by means of a.c. MXCD susceptibility, a technique that allows T-c to be probed precisely and unambiguo
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  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Temperature-dependent EXAFS measurements at the oxygen and fluorine K-edges of bulk single crystal oxides and fluorides and low-Z-surface systems are studied. Mean-square and mean-cubic relative variations of the nearest-neighbor bond length of the oxygen
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  • Bond length and adsorbate vibrations of (2x3)N/Cu(110): A SEXAFS study
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    • Temperature- and angle-dependent surface-extended x-ray-absorption fine-structure (SEXAFS) measurements on the system (2X3)N/Cu(110) are reported. Three inequivalent adsorption sites of the N atoms within the surface unit cell are identified. The successf
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