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MA: Magnetismus
MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)
MA 13.94: Poster
Dienstag, 9. März 2004, 15:00–19:00, Bereich A
Cobalt doping of a low-energy interface in anatase — •Michael Schreiber1, Rebecca Janisch1,2, Sibylle Gemming1, and Nicola Spaldin2 — 1Institut für Physik, Technische Universität, 09107 Chemnitz, Germany — 2Materials Research Laboratory, University of California, Santa Barbara CA 93106, USA
About two years ago Co-doped TiO2 anatase has been discovered to
exhibit
ferromagnetism at and above room temperature, i.e. to be a magnetically
robust
diluted magnetic semiconductor (DMS). Since then it has attracted
considerable
interest, but there is still controversy over the origin of the magnetism
as
well as the influencing factors.
In this work a low-energy Σ5(113)[-110] grain boundary in anatase
is
studied by density-functional band-structure calculations employing
norm-conserving pseudopotentials and plane waves [1].
The interfacial structure in pure anatase exhibits close structural and
electronic similarity to the pure bulk anatase crystal. Yet, the grain
boundary acts as a sink for dopant atoms, such as Co. This result confirms
the importance of the investigation of grain boundaries in the discussion
of
DMS properties. The influence of inner interfaces on the magnetic
properties
of Co-doped TiO2 is subject to ongoing investigations, the results of
which
will be shown on the poster.
[1] The ABINIT code is a common project of the Université Catholique de Louvain, Corning Inc., and other contributors (URI http://www.abinit.org).