| 1. |
- Weser, M., et al.
(författare)
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Induced magnetism of carbon atoms at the graphene/Ni(111) interface
- 2010
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 96:1
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Tidskriftsartikel (refereegranskat)abstract
- We report an element-specific investigation of electronic and magnetic properties of the graphene/Ni(111) system. Using x-ray magnetic circular dichroism, the occurrence of an induced magnetism of the carbon atoms in the graphene layer is observed. We attribute this magnetic moment to the strong hybridization between C pi and Ni 3d valence band states. The net magnetic moment of carbon in the graphene layer is estimated to be in the range of 0.05-0.1 mu(B) per atom.
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| 2. |
- Dedkov, Y S, et al.
(författare)
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Correlations in the electronic structure of half-metallic ferromagnetic CrO2 films: An x-ray absorption and resonant photoemission spectroscopy study
- 2005
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Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 72:6
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Tidskriftsartikel (refereegranskat)abstract
- The electronic structure of high-quality CrO2(100) films was investigated by means of x-ray absorption and resonant photoemission spectroscopy at the 2p-3d excitation threshold. The obtained binding energy of the occupied Cr 3d states is in agreement with the results predicted within the local spin-density approximation using the dynamical mean-field theory [L. Craco , Phys. Rev. Lett. 90, 237203 (2003)]. The reported data support a model of CrO2 as a half-metallic ferromagnet with strong electron-correlation effects.
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| 3. |
- Dedkov, Yu. S., et al.
(författare)
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Spin-resolved photoemission of a ferromagnetic Mn5Ge3(0001) epilayer on Ge(111)
- 2009
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Ingår i: Applied Physics Reviews. - : AIP Publishing. - 1931-9401. ; 105:7
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Tidskriftsartikel (refereegranskat)abstract
- Here we present a study of the electronic structure of epitaxial ferromagnetic Mn5Ge3(0001) films on Ge(111) by means of x-ray absorption spectroscopy, x-ray photoelectron spectroscopy, and spin-resolved photoelectron spectroscopy. Spin-polarization (P) value of +(15 +/- 5)% at the Fermi energy (E-F) is measured with a photon energy of h nu = 21.2 eV. Our findings are in contrast to recent band structure calculations, predicting P=-41% at E-F for the ferromagnetic bulk Mn5Ge3. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3103336]
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| 4. |
- Voss, S., et al.
(författare)
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Investigation of the stability of Mn-12 single molecule magnets
- 2009
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Ingår i: Applied Physics A: Materials Science & Processing. - : Springer Science and Business Media LLC. - 1432-0630. ; 94:3, s. 491-495
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Tidskriftsartikel (refereegranskat)abstract
- The stability of single crystals and monolayers of Mn-12 single molecule magnets under the influence of X-ray radiation and other possibly disruptive influences has been investigated by means of synchrotron radiation. Clear evidence for radiation induced sample degradation was found for both single crystals and monolayers. The comparison with spectra obtained after damaging the molecules by Ar+ sputtering, metal evaporation or water moistening indicates a possibility to distinguish between radiation damage and other external influences. The results clarify some of the previous conflicting reports on the integrity of Mn-12 molecules deposited on surfaces and are linked to the investigations aiming at studies of the electronic and magnetic properties of individual Mn-12 clusters.
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| 5. |
- Tesch, J., et al.
(författare)
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Impurity scattering and size quantization effects in a single graphene nanoflake
- 2017
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Ingår i: Physical Review B. - 2469-9969 .- 2469-9950. ; 95:7
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Tidskriftsartikel (refereegranskat)abstract
- By using Fourier-transform scanning tunneling spectroscopy we measure the interference patterns produced by the impurity scattering of confined Dirac quasiparticles in epitaxial graphene nanoflakes. Upon comparison of the experimental results with tight-binding calculations of realistic model flakes, we show that the characteristic features observed in the Fourier-transformed local density of states are related to scattering between different transverse modes (subbands) of a graphene nanoflake and allow direct insight into the gapped electronic spectrum of graphene. We also observe a strong reduction of quasiparticle lifetime which is attributed to the interaction with the underlying substrate. In addition, we show that the distribution of the on-site energies at flower defects leads to an effectively broken pseudospin selection rule, where intravalley backscattering is allowed.
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