| 1. |
- Arvanitis, D, et al.
(författare)
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Magnetic X-ray circular dichroism on in situ grown 3d magnetic thin films on surfaces
- 2001
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Ingår i: JOURNAL OF SYNCHROTRON RADIATION. - : MUNKSGAARD INT PUBL LTD. - 0909-0495. ; 8, s. 120-124
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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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| 2. |
- Arvanitis, D, et al.
(författare)
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Shape resonances of oriented molecules
- 2000
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Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. - 0368-2048. ; 113:1, s. 57-65
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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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| 3. |
- Ceballos, G, et al.
(författare)
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High-resolution X-ray absorption spectra of the pi* resonance of N-2 directly physisorbed on Cu(100)
- 2001
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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
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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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| 4. |
- Ceballos, G, et al.
(författare)
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Molecular geometry modifications upon adsorption for N2O: N and O K-edge NEXAFS
- 2001
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Ingår i: SURFACE SCIENCE. - : ELSEVIER SCIENCE BV. - 0039-6028. ; 482, s. 15-20
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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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| 5. |
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| 6. |
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| 7. |
- Dunn, JH, et al.
(författare)
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Influence of source coherence on X-ray absorption spectroscopy
- 2000
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Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 84:5, s. 1031-1034
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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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| 8. |
- Dunn, JH, et al.
(författare)
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Magnetisation reorientation in ultra-thin Fe films on Cu(100) upon deposition of Co
- 2001
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Ingår i: JOURNAL OF SYNCHROTRON RADIATION. - : MUNKSGAARD INT PUBL LTD. - 0909-0495. ; 8, s. 463-465
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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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| 9. |
- Haack, N, et al.
(författare)
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Shape resonances of oriented molecules: ab initio theory and experiment on hydrocarbon molecules
- 2000
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Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 84:4, s. 614-617
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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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| 10. |
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| 11. |
- Hahlin, A, et al.
(författare)
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Ultrathin Co films on flat and stepped Cu(111) surfaces: Determination of per atom orbital and spin moments
- 2002
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Ingår i: Applied Physics Reviews. - : AIP Publishing. - 1931-9401. ; 91:10, s. 6881-6883
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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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| 12. |
- Hahlin, A, et al.
(författare)
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Ultrathin Co films on flat and vicinal Cu(111) surfaces: per atom determination of orbital and spin moments
- 2003
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Ingår i: Journal of Physics: Condensed Matter. - : IOP Publishing. - 0953-8984. ; 15:5, s. 573-586
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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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| 13. |
- Removic-Langer, K, et al.
(författare)
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Spin and orbital moments in Au/Co/Au(111)/W(110) across the spin-reorientation transition-temperature
- 2003
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 200, s. 210-214
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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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| 14. |
- Wende, H, et al.
(författare)
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Surface EXAFS study of the p4g(2 x 2) reconstruction of C on Ni(100) and C on Ni films
- 2000
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Ingår i: SURFACE SCIENCE. - : ELSEVIER SCIENCE BV. - 0039-6028. ; 465:3, s. 187-197 Language: English
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Tidskriftsartikel (refereegranskat)abstract
- We report temperature- and angular-dependent surface extended X-ray absorption fine structure spectroscopy (SEXAFS) measurements of the p4g(2 x 2)C/Ni(100) system. Both a Ni(100) single crystal and a 4 monolayer Ni film evaporated on a Cu(100) single crys
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| 15. |
- Wessely, Ola, et al.
(författare)
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Initial and final state effects in the x-ray absorption process of La1-xSrxMnO3
- 2003
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Ingår i: Physical Review B : Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 68:23, s. 235109-1
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Tidskriftsartikel (refereegranskat)abstract
- We have probed the electronic structure of La1-xSrxMnO3 using x-ray absorption spectroscopy, and compared our results to theory. It is shown that the O projected spectrum reveals a signal that is consistent only with hybridized and delocalized Mn d-states whereas the Mn projected spectrum reveals a signal that can only be reproduced by atomic like theory allowing for multiplet formation between the core hole and the valence electrons of the final state. Our results indicate that the ground state electronic structure has delocalized Mn d-states. This is discussed to be caused by a dynamical screening of the core hole created in the absorption process.
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