Ab-initio studies on spin-orbit induced properties of solids and surfaces
CFM Seminars
- Speaker
-
H. Ebert, Universität München, München
- When
-
2014/11/18
17:00 - Place
- In the Auditorium in the below-ground floor of the Korta building
- Add to calendar
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Spin-orbit coupling gives rise in magnetic solids to a large number of effects
that are at the
same time of great scientific as well as technological interest. As examples
for this, results of
recent investigations based on a fully relativistic Dirac formalism on the
magneto-crystalline
anisotropy, angle resolved photo emission (ARPES) and the Gilbert damping
parameter will
be presented. To achieve a coherent treatment of the magnetic anisotropy the
Breit
interaction was recently included in the underlying Hamiltonian. In this way
the spin-orbit
induced part of the anisotropy energy as well as the dipolar shape anisotropy
are treated on
the same quantum mechanical footing. As will be demonstrated for various
layered magnetic
systems, this approach gives results very similar to the common classical
approximation to
the shape anisotropy. The magnetization dynamics in magnetic materials is
conventionally
described in a phenomenological way on the basis of the Landau-Lifshitz-
Gilbert (LLG)
equation, with the Gilbert damping parameter α representing damping
processes. Results of
ab-initio calculations of the Gilbert damping parameter and its temperature
dependence will
be presented and discussed for a number of transition metal systems. Another
field that is
strongly influenced by spin-orbit coupling is electron spectroscopy where it
gives rise to
various dichroic and magneto-optical effects. Results of corresponding studies
on spin and
angle resolved photo emission will be presented that are based on the one-step
model of
photo emission. As it will be demonstrated, ARPES is especially suited to
probe the role of
spin-orbit coupling for the electronic structure of Rashba-type systems or
topological
insulators.