Spin-orbit coupling influenced X-ray spectroscopies and resonant X-ray magneto-optical properties of transition metal systems
Jan Minar
ISBN 978-3-8325-0232-4
176 pages, year of publication: 2003
price: 40.50 €
Among the many tools one has in hand in material
science, the various electronic spectroscopies are of particular
interest. Techniques based on synchrotron radiation, such as
spin-resolved photoemission, X-ray magnetic circular and linear
dichroism, resonant X-ray scattering and also X-ray magnetic
microscopy have been shown to provide unique tools for the
study of the magnetic phenomena and magnetic materials. However, it became
apparent that all these new achievements need a strong theoretical
support. Ab-initio theoretical investigations presented here adopted a
one-electron picture, within the framework of Density functional
theory, using the
multiple scattering theory to solve the electronic structure
problem. Most of the spectroscopies to be dealt with here can be
seen as a direct consequence of the presence of a spontaneous
magnetisation and relativistic effects, in particular the spin-orbit
coupling.
To deal with all relativistic effects and magnetism on the same level,
the fully relativistic formalism will be used in the following. Thus,
one of the
goals of this work is to apply the
Korringa-Kohn-Rostoker (KKR) band structure method in its relativistic
version to a wide range of spectroscopies. Accordingly, all results
will be compared with available experimental data
as far as possible. Based on these results various aspects
connected with experiments will be discussed in detail.
In the first chapter
the theoretical basis of this work will be introduced. The second part of
this thesis is dedicated to the photoemission spectroscopies, i.e.
spin-resolved Auger electron spectroscopy, Fano effects in valence band photoem
ission and core
level photoemission.
In a third part we discuss resonant magneto-optical
effects in the X-ray regime. Last chapter is dealing with
non-collinear spin-structures within multiple scattering theory and
its application to studies of photoemission and X-ray absorption is
described.