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Profile of the U 5f magnetization in U∕Fe multilayers

S. D. Brown, L. Bouchenoire, P. Thompson, R. Springell, A. Mirone, W. G. Stirling, A. Beesley, M. F. Thomas, R. C. C. Ward, M. R. Wells, S. Langridge, S. W. Zochowski, and G. H. Lander
Phys. Rev. B 77, 014427 – Published 18 January 2008
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Abstract
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Article Text
  • INTRODUCTION
  • X-RAY RESONANT MAGNETIC REFLECTIVITY
  • EXPERIMENTAL DETAILS
  • RESULTS
  • DISCUSSION
  • CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    We have used the x-ray resonant magnetic reflectivity technique to obtain the profile of the induced uranium magnetic moment for selected U∕Fe multilayer samples. This study extends the use of x-ray magnetic scattering for induced moment systems to the 5f actinide metals. The spatial dependence of the U magnetization shows that the predominant fraction of the polarization is present at the interfacial boundaries, decaying rapidly towards the center of the uranium layer, in good agreement with predictions.

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    • Received 18 October 2007

    DOI:https://doi.org/10.1103/PhysRevB.77.014427

    ©2008 American Physical Society

    Authors & Affiliations

    S. D. Brown*, L. Bouchenoire*, and P. Thompson*

    • XMaS, UK-CRG, European Synchrotron Radiation Facility, BP220, F-38043 Grenoble Cedex, France

    R. Springell†, A. Mirone, and W. G. Stirling*

    • European Synchrotron Radiation Facility, BP220, F-38043 Grenoble Cedex, France

    A. Beesley and M. F. Thomas

    • Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom

    R. C. C. Ward and M. R. Wells

    • Clarendon Laboratory, University of Oxford, Oxford, Oxon OX1 3PU, United Kingdom

    S. Langridge

    • Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom

    S. W. Zochowski

    • Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom

    G. H. Lander

    • European Commission, JRC, Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe, Germany

    • *Also at Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom.
    • †Also at Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom.

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    Issue

    Vol. 77, Iss. 1 — 1 January 2008

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    Images

    • Figure 1
      Figure 1
      (Color online) Schematic diagram of the longitudinal geometry used in the XRMR measurements. ki and kf are the wave vectors of the incoming and outgoing circularly polarized x rays, respectively. M is the magnetization of the sample. The applied field H is parallel to M.Reuse & Permissions
    • Figure 2
      Figure 2
      (Color online) Energy variation of the charge reflectivity in the vicinity of the U M4 edge for sample SN71. The experimental data are shown as the open black circles and the calculated reflectivity is represented by the solid red line. The spectra have been scaled by factors of 10−3 between each energy.Reuse & Permissions
    • Figure 3
      Figure 3
      (Color online) The (a) real and (b) imaginary parts of the resonant charge scattering factor are shown in electron units for sample SN71. The imaginary part is determined from the calculations of the charge reflectivity and the real part is its Kramers-Kronig transform. The insert of (b) is a comparison of the modeled imaginary scattering factor and the fluorescence, reported previously (Ref. 12).Reuse & Permissions
    • Figure 4
      Figure 4
      (Color online) The magnetic-charge interference scattering as a function of energy across the U M4 edge for sample SN71. The data are shown as the open black circles and the fitted calculation is represented by the solid red line, both are scaled by a Q4 factor. The results presented for each energy have been offset by 20 cts/mon for clarity, where cts/mon indicates the intensity normalized to the incident beam.Reuse & Permissions
    • Figure 5
      Figure 5
      (Color online) The (a) real and (b) imaginary parts of the resonant magnetic scattering factor for sample SN71. The imaginary part is determined from the calculations of the charge-magnetic interference scattering and the real part is its Kramers-Kronig transform. The insert of (b) is a comparison of the XMCD signals determined by this model and measurements made at room temperature in a field of 1T by Wilhelm et al. (Ref. 12).Reuse & Permissions
    • Figure 6
      Figure 6
      (Color online) Profiles of the relative uranium and iron densities as a function of bilayer depth are shown in panels (a) and (c) of Fig. 6 for samples SN71 and SN76, respectively. The errors in the relative density are estimated as ±0.1. Panels (b) and (d) present the profiles of the uranium polarization, given in units of μB∕U determined from XMCD measurements (Ref. 12). The error bars are estimated as ±0.02μB∕U. We note that the dominant negative sign of the polarization is an assumption, based on XMCD (Ref. 12) and theory (Refs. 2, 3).Reuse & Permissions
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