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Abstract

Phys. Rev. B 71, 184407 (2005) (11 pages)

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Absence of spin-flip transition at the Cr(001) surface:   A combined spin-polarized scanning tunneling microscopy and neutron scattering study

T. Hänke, S. Krause, L. Berbil-Bautista, M. Bode, and R. Wiesendanger

Institute of Applied Physics and Microstructure Research Center, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany

V. Wagner

Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, D-38116 Braunschweig, Germany

D. Lott and A. Schreyer

Institut für Werkstoffforschung, GKSS Forschungszentrum, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany

(Received 6 January 2005; published 13 May 2005)

The spin-density wave (SDW) on Cr(001) has been investigated at temperatures between 20–300  K by means of spin-polarized scanning tunneling microscopy (SP-STM). Although neutron-scattering data measured on the same crystal clearly show a spin-flip transition from a transversal (T)-SDW to a longitudinal (L)-SDW at the expected spin-flip (SF) temperature TSF=123  K, no change was found on the Cr(001) surface with SP-STM. Throughout the entire temperature range the Cr(001) surface maintains a topological antiferromagnetic order with an in-plane magnetization that inverts between adjacent atomically flat terraces separated by monatomic step edges. The experimental results are interpreted by an absence of a spin-flip transition in the near-surface region probably driven by the surface anisotropy. The continuous connection of the surface T-SDW to the bulk L-SDW is accomplished by the formation of a 90° domain wall just below the surface.

©2005 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v71/e184407

doi:10.1103/PhysRevB.71.184407

PACS: 75.30.Fv, 75.70.Rf, 68.37.Ef, 61.12.Ld

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References

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