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22 results on '"Chauvistre, R."'

2. Magnetic extended x-ray absorption fine structure at the L(sub3,2) edges of Fe and Co on Cu(001)

Author

Srivastava, P., Lemke, L., Wende, H., Chauvistre, R., Haack, N., Baberschke, K., Hunter-Dunn, J., Arvanitis, D., Martensson, N., Ankudinov, A., and Rehr, J.J.

Subjects
Extended X-ray absorption fine structure -- Usage, Thin films -- Magnetic properties, Physics
Abstract

Extended x-ray absorption fine structure (EXAFS) and magnetic extended x-ray absorption fine structure (MEXAFS) measurements are reported, on 30 monolayer (ML) Fe and Co films on Cu(001) substrates. MEXAFS oscillations were determined up to 500 eV above the edge corresponding to 11.5 A(super-1) in k space. Experimental data of Fe are compared with multiple-scattering calculations.

Published
1998

5. Surface EXAFS study of the p4g(2 x 2) reconstruction of C on Ni(100) and C on Ni films

Author

Wende, H, Chauvistre, R, Haack, N, Ceballos, G, Wilhelm, F, Baberschke, K, Srivastava, P, Arvanitis, D, Wende, H, Chauvistre, R, Haack, N, Ceballos, G, Wilhelm, F, Baberschke, K, Srivastava, P, and Arvanitis, D

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, Addresses: Wende H, Free Univ Berlin, Inst Expt Phys, Arnimallee 14, D-14195 Berlin, Germany. Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany. IIT, Dept Phys, New Delhi 110016, India. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden.

Published
2000

6. Magnetic extended x-ray absorption fine structure at the L-3,L-2 edges of Fe and Co on Cu(001)

Author

Srivastava, P, Lemke, L, Wende, H, Chauvistre, R, Haack, N, Baberschke, K, Hunter-Dunn, J, Arvanitis, D, Martensson, N, Ankudinov, A, Rehr, JJ, Srivastava, P, Lemke, L, Wende, H, Chauvistre, R, Haack, N, Baberschke, K, Hunter-Dunn, J, Arvanitis, D, Martensson, N, Ankudinov, A, and Rehr, JJ

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, Addresses: Srivastava P, Univ Rajasthan, Dept Phys, Jaipur 302004, Rajasthan, India. Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden. Univ Washington, Dept Phys, Seattle, WA 98175 USA.

Published
1998

7. Magnetic extended x-ray absorption fine structure at the L-3,L-2 edges of 3d elements

Author

Lemke, L, Wende, H, Srivastava, P, Chauvistre, R, Haack, N, Baberschke, K, Hunter-Dunn, J, Arvanitis, D, Martensson, N, Ankudinov, A, Rehr, JJ, Lemke, L, Wende, H, Srivastava, P, Chauvistre, R, Haack, N, Baberschke, K, Hunter-Dunn, J, Arvanitis, D, Martensson, N, Ankudinov, A, and Rehr, JJ

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, Addresses: Srivastava P, Free Univ Berlin, Inst Expt Phys, Arnimallee 14, D-14195 Berlin, Germany. Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden. Univ Washington, Dept Phys, Seattle, WA 98175 U

Published
1998

8. Evidence for photoelectron backscattering by interstitial charge densities

Author

Wende, H, Srivastava, P, Chauvistre, R, May, F, Baberschke, K, Arvanitis, D, Rehr, JJ, Wende, H, Srivastava, P, Chauvistre, R, May, F, Baberschke, K, Arvanitis, D, and Rehr, JJ

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, Addresses: FREE UNIV BERLIN, INST EXPT PHYS, D-14195 BERLIN, GERMANY. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN. UNIV WASHINGTON, DEPT PHYS, SEATTLE, WA 98195. UNIV RAJASTHAN, DEPT PHYS, JAIPUR 302004, RAJASTHAN, INDIA.

Published
1997

9. Surface atomic-XAFS for nitrogen atoms on copper

Author

Wende, H, Arvanitis, D, Tischer, M, Chauvistre, R, Henneken, H, May, F, Baberschke, K, Wende, H, Arvanitis, D, Tischer, M, Chauvistre, R, Henneken, H, May, F, and Baberschke, K

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, Addresses: Wende H, FREE UNIV BERLIN, INST EXPT PHYS, ARNIMALLEE 14, D-14195 BERLIN, GERMANY. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN.

Published
1997

10. Magnetic coupling of Ni, Cu and Co bi- and trilayers probed by magnetic circular X-ray dichroism

Author

May, F, Tischer, M, Arvanitis, D, Dunn, JH, Henneken, H, Wende, H, Chauvistre, R, Baberschke, K, May, F, Tischer, M, Arvanitis, D, Dunn, JH, Henneken, H, Wende, H, Chauvistre, R, and Baberschke, K

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, Addresses: May F, FREE UNIV BERLIN, INST EXPT PHYS, ARNIMALLEE 14, D-14195 BERLIN, GERMANY. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN.

Published
1997

11. Modifications of the electronic and magnetic properties of ultrathin Ni/Cu(100) films induced by stepwise oxidation

Author

May, F, Tischer, M, Arvanitis, D, Russo, M, Dunn, JH, Henneken, H, Wende, H, Chauvistre, R, Martensson, N, Baberschke, K, May, F, Tischer, M, Arvanitis, D, Russo, M, Dunn, JH, Henneken, H, Wende, H, Chauvistre, R, Martensson, N, and Baberschke, K

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, Addresses: May F, FREE UNIV BERLIN, INST EXPTL PHYS, ARNIMALLEE 14, D-14195 BERLIN, GERMANY. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN.

Published
1996

12. Bond length and adsorbate vibrations of (2x3)N/Cu(110): A SEXAFS study

Author

Wende, H, Arvanitis, D, Tischer, M, Chauvistre, R, Henneken, H, May, F, Baberschke, K, Wende, H, Arvanitis, D, Tischer, M, Chauvistre, R, Henneken, H, May, F, and Baberschke, K

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, Addresses: Wende H, FREE UNIV BERLIN, INST EXPT PHYS, ARNIMALLEE 14, D-14195 BERLIN, GERMANY. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN.

Published
1996

18. Magnetic EXAFS at 1.3,2 - edges of Fe on Cu

Author

Srivastava, P., primary, Hemke, L., additional, Wende, H., additional, Chauvistre, R., additional, Haack, N., additional, Baberschke, K., additional, Hunter-Dunn, J., additional, Arvanitis, D., additional, Martensson, N., additional, Ankudinov, A., additional, and Rehr, J.J., additional

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