SwePub - sökning: WFRF:(Baberschke K)

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1.	Rüdt, C, et al. (författare) Curie Temperature and Critical Exponent µ in a Fe2/V5 Superlattice 2002 Ingår i: Phys.stat.sol.. ; a189, s. 363- Tidskriftsartikel (refereegranskat)
2.	Anisimov, AN, et al. (författare) Magnetic anisotropies of Fe-n/V-m(001) superlattices determined by Ferromagnetic Resonance 1998 Ingår i: IEEE TRANSACTIONS ON MAGNETICS. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9464. ; 34:4, s. 873-875 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract The temperature-dependent magnetic anisotropies of Fe-n/V-m(001) superlattices on MgO(001) were determined by Ferromagnetic Resonance (FMR). The re-layer thickness n ranges between 2 and 4 atomic layers. The shape anisotropy dominates, and the easy-axis o
3.	Anisimov, AN, et al. (författare) Orbital magnetism and magnetic anisotropy probed with ferromagnetic resonance 1999 Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 82:11, s. 2390-2393 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract Via ferromagnetic resonance both the magnetic anisotropy energy (MAE) and the spectroscopic splitting tensor (g tensor) for a bcc Fe-2/V-5(001) superlattice are measured independently. The theoretically proposed proportionality between the anisotropy of t
4.	Anisimov, AN, et al. (författare) The temperature-dependent in- and out-of-plane magnetic anisotropies in Fe-n/V-m(001) superlattices 1997 Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 9:48, s. 10581-10593 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract Fe-n/V-m(001) superlattices grown on MgO(001) are studied by ferromagnetic resonance (FMR). The temperature dependence of the second- and fourth-order in- and out-of-plane magnetic anisotropies were determined from azimuthal and polar angular-dependent FM
5.	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
6.	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
7.	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
8.	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
9.	BABERSCHKE, K, et al. (författare) PROCEEDINGS OF THE 8TH INTERNATIONAL-CONFERENCE ON X-RAY-ABSORPTION FINE-STRUCTURE - XAFS-VIII - HELD AT THE FREIE-UNIVERSITAT, BERLIN, GERMANY, 28 AUGUST 2 SEPTEMBER 1994 - PREFACE 1995 Ingår i: PHYSICA B. - : ELSEVIER SCIENCE BV. ; 209:1-4 Annan publikation (övrigt vetenskapligt/konstnärligt)
10.	Bernien, M., et al. (författare) Tailoring the Nature of Magnetic Coupling of Fe-Porphyrin Molecules to Ferromagnetic Substrates 2009 Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 102:4, s. 047202- Tidskriftsartikel (refereegranskat)abstract We demonstrate that an antiferromagnetic coupling between paramagnetic Fe-porphyrin molecules and ultrathin Co and Ni magnetic films on Cu(100) substrates can be established by an intermediate layer of atomic oxygen. The coupling energies have been determined from the temperature dependence of x-ray magnetic circular dichroism measurements. By density functional theory+U calculations the coupling mechanism is shown to be superexchange between the Fe center of the molecules and Co surface-atoms, mediated by oxygen.
11.	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
12.	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
13.	Ceballos, G, et al. (författare) Vibrational fine structure in the N 1s -> pi* resonance of the N-2 molecule physisorbed on the Cu(100) surface 2000 Ingår i: SURFACE SCIENCE. - : ELSEVIER SCIENCE BV. - 0039-6028. ; 448:2-3, s. 261-268 Tidskriftsartikel (refereegranskat)abstract High-resolution photoabsorption spectra at the N 1s-->pi* resonance of N-2 physisorbed on the Cu(100) surface are reported. The vibrational fine structure of this resonance could be resolved, allowing the determination of the vibrational constants, the li
14.	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
15.	Dunn, JH, et al. (författare) A comparative study of X-ray absorption spectroscopy at various synchrotron facilities and the effect of transverse source coherence 2000 Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. - 0368-2048. ; 113:1, s. 67-77 Tidskriftsartikel (refereegranskat)abstract Core level X-ray Absorption Spectroscopy measurements have been performed at the L-3,L-2 edges of thin film Fe samples deposited on the (100) surface of Cu. Soft X-rays from five different beamlines have been used to measure spectra from identical samples
16.	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
17.	Hjortstam, O, et al. (författare) Magnetic anisotropy and magnetostriction in tetragonal and cubic Ni 1997 Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. - 0163-1829. ; 55:22, s. 15026-15032 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract The magnetic anisotropy energy (MAE) of face-centered-tetragonal (fct) Ni is calculated as a function of the axial c/a ratio. It is shown that the MAE for fct Ni is tremendously enhanced relative to the MAE for fec Ni. The theoretical results are compared
18.	J.Lindner, A.Scherz, P.Poulopoulos, C.Rudt, A.N.Anisimov, H.Wende, K.Baberschke, P.Blomquist, R.Wäppling, F.Wilhelm, N.B.Brookes (författare) Ultrathin Fe-limit in Fe/V(001) superlattices 2003 Ingår i: Journal of Magnetism and Magnetic Materials. ; 256:1-3, s. 404-411 Tidskriftsartikel (refereegranskat)
19.	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
20.	Lindner, J, et al. (författare) T 3/2 Dependence of the interlayer Exchange Coupling in Ferromagnetic Multilayers 2002 Ingår i: Phys.Rev.Letters. ; 88, s. 167206- Tidskriftsartikel (refereegranskat)
21.	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
22.	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
23.	May, F, et al. (författare) Modifications of the electronic and magnetic properties of ultrathin Ni/Cu(100) films induced by stepwise oxidation 1996 Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. ; 53:3, s. 1076-1079 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract We report near-edge x-ray-absorption fine-structure (NEXAFS) and magnetic circular x-ray dichroism (MCXD) measurements of 4-ML Ni films grown on Cu(100). The films were exposed to oxygen which then adsorbed in different adsorption states. The changes in t
24.	Poulopoulos, P, et al. (författare) Magnetic anisotropy and exchange coupling in FenVm(001) superlattices on MgO(001) 1997 Ingår i: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 170:1-2, s. 57-66 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract Fe(0 0 1) single layers and FenVm(0 0 1) superlattices were epitaxially grown on MgO(0 0 1) substrates, where n and m denote the number of monolayers (ML) of the constituents within each modulation period. n and tn were varied between 3 and 14 ML. Structu
25.	Rüdt, C, et al. (författare) Absence of dimensional crossover in metallic ferromagnetic superlattices 2002 Ingår i: Phys.Rev.B. ; 65:220404 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
26.	Scherz, A., H. Wende, P. Poulopoulos, J. Lindner, K. Baberschke, P. Blomquist, R Wäppling, F. Wilhelm and N.B. Brookes (författare) Induced V and reduced Fe moments at the interface of Fe/V (001) superlattices 2001 Ingår i: Physical Review. ; B64, s. 180407(R)- Tidskriftsartikel (refereegranskat)
27.	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
28.	Tischer, M, et al. (författare) Enhancement of orbital magnetism at surfaces: Co on Cu(100) 1996 Ingår i: JOURNAL OF APPLIED PHYSICS. - : AMER INST PHYSICS. ; 79:8 Annan publikation (övrigt vetenskapligt/konstnärligt)
29.	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
30.	TISCHER, M, et al. (författare) LOCAL MAGNETISM AND ELEMENT-SPECIFIC SUSCEPTIBILITY FOR NI/CU(100) 1995 Ingår i: VACUUM. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0042-207X. ; 46:8-10, s. 1211-1214 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract 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
31.	TROGER, L, et al. (författare) LOCAL DYNAMICS AND LOCAL THERMAL-EXPANSION AROUND LIGHT-ELEMENTS IN THE BULK AND ON SURFACES 1995 Ingår i: PHYSICA B. - : ELSEVIER SCIENCE BV. - 0921-4526. ; 209:1-4, s. 267-268 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
32.	Wende, H, et al. (författare) Bond length and adsorbate vibrations of (2x3)N/Cu(110): A SEXAFS study 1996 Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. - 0163-1829. ; 54:8, s. 5920-5926 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract 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
33.	Wende, H, et al. (författare) Evidence for photoelectron backscattering by interstitial charge densities 1997 Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. ; 9:31 Annan publikation (övrigt vetenskapligt/konstnärligt)abstract The presence of oscillatory structures in the atomic x-ray absorption background is reported for the first time for surface-EXAFS of c(2 x 2)N/Cu(100) and (2 x 3)N/Cu(110). Systematic analysis of this feature (AXAF'S) and comparison to theory yields new i
34.	Wende, H, et al. (författare) Magnetic L-edge EXAFS of 3d elements: multiple-scattering analysis and spin dynamics 1999 Ingår i: JOURNAL OF SYNCHROTRON RADIATION. - : MUNKSGAARD INT PUBL LTD. - 0909-0495. ; 6, s. 696-698 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract Magnetic EXAFS (MEXAFS) adds magnetic selectivity to the well established EXAFS technique opening the door to the exploration of local magnetic structure and disorder. Of particular interest is the behavior of 3d transition metal systems. By utilizing the
35.	Wende, H., et al. (författare) Substrate-induced magnetic ordering and switching of iron porphyrin molecules 2007 Ingår i: Nature Materials. - : Springer Science and Business Media LLC. - 1476-1122 .- 1476-4660. ; 6:7, s. 516-520 Tidskriftsartikel (refereegranskat)abstract To realize molecular spintronic devices, it is important to externally control the magnetization of a molecular magnet. One class of materials particularly promising as building blocks for molecular electronic devices is the paramagnetic porphyrin molecule in contact with a metallic substrate. Here, we study the structural orientation and the magnetic coupling of in-situ-sublimated Fe porphyrin molecules on ferromagnetic Ni and Co films on Cu(100). Our studies involve X-ray absorption spectroscopy and X-ray magnetic circular dichroism experiments. In a combined experimental and computational study we demonstrate that owing to an indirect, superexchange interaction between Fe atoms in the molecules and atoms in the substrate (Co or Ni) the paramagnetic molecules can be made to order ferromagnetically. The Fe magnetic moment can be rotated along directions in plane as well as out of plane by a magnetization reversal of the substrate, thereby opening up an avenue for spin-dependent molecular electronics.
36.	Wende, H, et al. (författare) Surface atomic-XAFS for nitrogen atoms on copper 1997 Ingår i: JOURNAL DE PHYSIQUE IV. - : EDITIONS PHYSIQUE. - 1155-4339. ; 7:C2, s. 211-212 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract The presence of oscillatory structures in the atomic x-ray absorption background is reported for the first time for surface EXAFS of c(2x2)NiCu(100) and (2x3)N/Cu(110). The experimental data for N/Cu(110) are compared to FEFF7 calculations of the oscillat
37.	Wende, H, et al. (författare) Surface EXAFS study of the p4g(2 x 2) reconstruction of C on Ni(100) and C on Ni films 2000 Ingår i: SURFACE SCIENCE. - : ELSEVIER SCIENCE BV. - 0039-6028. ; 465:3, s. 187-197 Language: English 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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