Spin-polarized scanning tunneling microscopy: Insight into magnetism from nanostructures to atomic scale spin structures

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Autor/in:
Erscheinungsjahr:
2005
Medientyp:
Text
Schlagworte:
  • Anisotropy
  • Crystallography
  • Iron/chemistry
  • Magnetics
  • Microscopy, Scanning Tunneling
  • Models, Chemical
  • Nanostructures
  • Temperature
  • Tungsten/chemistry
Beschreibung:
  • The system of Fe on W(001) is investigated using spin-integrated as well as spin-resolved scanning tunneling microscopy (STM). This study ranges from three-dimensional Fe islands down to the Fe monolayer and different growth modes are observed related to the preparation temperature. With scanning tunneling spectroscopy (STS), a layer-dependent electronic structure is observed that can easily be used to assign the local coverage to the investigated sample areas. Spin-resolved measurements of the ferromagnetic layers in the pseudomorphic regime immediately reveal the fourfold magnetic in-plane anisotropy. A direct comparison of the observed arrangement of the domains of the exposed layers shows a rotation of the easy axis from the fourth to the third monolayer and a collinear magnetic alignment of third and second monolayer. This is confirmed by the quantitative analysis of the layer-resolved intensities of differential tunneling conductance. The first monolayer does not show a magnetic component parallel to the surface but has a perpendicular anisotropy. For this layer, measurements with an applied magnetic field prove a c(2×2) antiferromagnetic structure, i.e., a checkerboard arrangement of spins. © 2005 Wiley-Liss, Inc.
Lizenz:
  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH

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oai:www.edit.fis.uni-hamburg.de:publications/c85c1c02-0dbf-4601-8588-9ac19764ce47