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Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments

Author

Listed:
  • A. Chikina

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16
    St. Petersburg State University)

  • M. Höppner

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16
    Max Planck Institute for Solid State Research)

  • S. Seiro

    (Max Planck Institute for Chemical Physics of Solids)

  • K. Kummer

    (European Synchrotron Radiation Facility, 6 Rue Jules Horowitz)

  • S. Danzenbächer

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16)

  • S. Patil

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16)

  • A. Generalov

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16)

  • M. Güttler

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16)

  • Yu. Kucherenko

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16
    Institute for Metal Physics, National Academy of Sciences of Ukraine)

  • E. V. Chulkov

    (Donostia International Physics Center (DIPC)
    Tomsk State University)

  • Yu. M. Koroteev

    (Tomsk State University
    Institute of Strength Physics and Materials Science of Siberian Branch Russian Academy of Sciences)

  • K. Koepernik

    (Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden)

  • C. Geibel

    (Max Planck Institute for Chemical Physics of Solids)

  • M. Shi

    (Swiss Light Source, Paul Scherrer Institut)

  • M. Radovic

    (Swiss Light Source, Paul Scherrer Institut
    SwissFEL, Paul Scherrer Institut)

  • C. Laubschat

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16)

  • D. V. Vyalikh

    (Institute of Solid State Physics, Dresden University of Technology, Zellescher Weg 16
    St. Petersburg State University)

Abstract

Carrying a large, pure spin magnetic moment of 7 μB per atom in the half-filled 4f shell, divalent europium is an outstanding element for assembling novel magnetic devices in which a two-dimensional electron gas may be polarized due to exchange interaction with an underlying magnetically-active Eu layer. Here we show that the Si-Rh-Si surface trilayer of the antiferromagnet EuRh2Si2 bears a surface state, which exhibits an unexpected and large spin splitting controllable by temperature. The splitting sets in below ~32.5 K, well above the ordering temperature of the Eu 4f moments (~24.5 K) in the bulk, indicating a larger ordering temperature in the topmost Eu layers. The driving force for the itinerant ferromagnetism at the surface is the aforementioned exchange interaction. Such a splitting may also be induced into states of functional surface layers deposited onto the surface of EuRh2Si2 or similarly ordered magnetic materials with metallic or semiconducting properties.

Suggested Citation

  • A. Chikina & M. Höppner & S. Seiro & K. Kummer & S. Danzenbächer & S. Patil & A. Generalov & M. Güttler & Yu. Kucherenko & E. V. Chulkov & Yu. M. Koroteev & K. Koepernik & C. Geibel & M. Shi & M. Rado, 2014. "Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments," Nature Communications, Nature, vol. 5(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4171
    DOI: 10.1038/ncomms4171
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