Subject Area A1: Magnetic Nanostructures on Semiconductor Surfaces
Jens Wiebe, Roland Wiesendanger
The investigation of magnetic adsorbates on non-magnetic semiconductors will yield a better
understanding of magnetic interactions in semiconductors.
In this subject area we want to study magnetic nanostructures, such as clusters, chains or rings,
on semiconductor surfaces. Such nanostructures are prepared by atom manipulation using the tip of a
scanning tunneling microscope.
The magnetic properties will be investigated on the
atomic scale by spin-polarized scanning tunneling microscopy.
It is possible to measure the magnetization curves of single magnetic atoms in a non-magnetic
environment. These magnetization curves provide valuable information about the magnetic anisotropic energy,
the magnetic moment of the atom and the magnetic interaction between single atoms and ferromagnetic layers.
A new sub-kelvin microscope with translation stage enables spin-polarized cross-sectional scanning tunneling microscopy.
(a) Local density of states of a two-dimensional electron system that is induced by cobalt islands on the
(b) A topographic image of the rectangular area indicated in (a) shows
two cobalt islands.
(c) Chain of five iron atoms on an InAs(110) surface.
"Scanning Probe Microscopy and Spectroscopy: Methods and Applications"
Cambridge University Press, Cambridge 1994.
A. Wachowiak, J. Wiebe, M. Bode, O. Pietzsch, M. Morgenstern, and R. Wiesendanger,
"Direct Observation of Internal Spin Structure of Magnetic Vortex Cores",
Science 298, 577-580 (2002).
F. Meier, L. Zhou, J. Wiebe, and R. Wiesendanger,
"Revealing Magnetic Interactions from Single-Atom Magnetization Curves"
Science 320, 82-86 (2008).
Spin-polarized scanning tunneling microscopy on epitaxial ferromagnet-semiconductor heterostructures
Atomic magnetic nanostructures on III-V-semiconductor surfaces
Epitaxial magnetic nanostructures on Si(111) and Ge(111)