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

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Erscheinungsjahr:
2005
Medientyp:
Text
Schlagworte:
  • Spin density waves
  • Chromium
  • Charge density waves
  • Magnetic Anisotropy
  • Magnetization
  • Magnetism
  • Spin density waves
  • Chromium
  • Charge density waves
  • Magnetic Anisotropy
  • Magnetization
  • Magnetism
Beschreibung:
  • 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.
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  • info:eu-repo/semantics/closedAccess
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Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/d7a8a1c5-d32c-40fb-867f-195971f3b6cb