Eur. Phys. J. A 13, 233-237 (2002)
Radioactive ions for solid-state investigations at magnetic surfaces and interfaces
H.H. Bertschat, K. Potzger, A. Weber and W.-D. ZeitzBereich Strukturforschung, Hahn-Meitner-Institut Berlin GmbH, D 14091 Berlin, Germany
(Received: 1 May 2001 / Revised version: 2 July 2001)
Abstract
Hyperfine interactions observed at isomeric states of radioactive probe
nuclei are used as a tool for solid-state investigations. This method is
sensitive to atomic-scale properties. In recent years surface and interface
investigations using radioactive probes delivered many results which can
hardly be achieved by any other method. Several groups, e.g., from Konstanz,
Leuven, Groningen, Aarhus, Uppsala, Tel Aviv, Pennsylvania, contributed to
this field. Our group studies magnetic properties at surfaces and interfaces
performing perturbed angular correlation (PAC) measurements in the UHV
chamber ASPIC (Apparatus for Surface Physics and Interfaces at CERN). We
take advantage of the enhanced variety of PAC probes delivered by the
on-line mass separator ISOLDE. First, we report on measurements of magnetic
hyperfine fields (
) at Se adatoms on a ferromagnetic substrate
using
as a PAC probe. The investigation of induced magnetic
interactions in nonmagnetic materials is a further subject of our studies.
Here the nonmagnetic
4d element Pd is investigated, when it is in contact
with ferromagnetic nickel. An outlook will be given on studies to be done in
the future. The experiments were performed at the HMI, Berlin, and at
CERN, Geneva.
75.70.-i - Magnetic properties of thin films, surfaces, and interfaces.
75.70.Rf - Surface magnetism.
76.80.+y - Mössbauer effect; other
-ray spectroscopy.
© Società Italiana di Fisica, Springer-Verlag 2002
