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Physical Review B
(Condensed Matter and Materials Physics -15(II))

Phys. Rev. B 67, 245412 (2003) (16 pages)

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Nanoscale magnetism probed by nuclear resonant scattering of synchrotron radiation

R. Röhlsberger, J. Bansmann, V. Senz, K. L. Jonas, A. Bettac, and K. H. Meiwes-Broer
Universität Rostock, Universitätsplatz 3, 18055 Rostock, Germany
O. Leupold
European Synchrotron Radiation Facility, Boîte Postale 220, 38043 Grenoble Cedex, France

(Received 27 October 2002; published 26 June 2003; publisher error corrected 30 June 2003)

Time-resolved nuclear resonant scattering of synchrotron radiation is applied to determine the spin structure of magnetic nanostructures on surfaces. From the temporal beat pattern the magnitude and the direction of magnetic hyperfine fields in the sample can be determined. We describe an algorithm to extract the magnetic structure function from a series of such measurements at different sample orientations. This reconstruction technique is applied to study the remanent spin structure of relaxed Fe islands on the surface of a W(110) single crystal. Unexpectedly, we find two orthogonal magnetic sublattices oriented along the in-plane [001] and [11-bar 0] directions in a proportion of 4:1. This spin structure appears to be independent of capping layers that consist of Ag or C. A completely different spin structure is found for a different shape distribution of the islands. These results are discussed in terms of magnetic anisotropies that are present in this system. Moreover, the results demonstrate that the outstanding brilliance of present-day synchrotron-radiation sources allows one to determine the magnetic spin structure of magnetic clusters and nanoparticles on surfaces with sensitivities reaching into the monolayer regime. ©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v67/e245412
doi:10.1103/PhysRevB.67.245412
PACS: 75.25.+z, 75.75.+a, 36.40.Cg, 76.80.+y        Additional Information

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