APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011;
Dallas, Texas
Abstract: L16.00001 : Soft X-ray Spectroscopy of Magnetic Nanostructures: New Phenomena and Applications
2:30 PM–3:06 PM
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The delicate balance between charge, spin, orbital, and lattice
degrees of
freedom in transition metal oxides leads to unique phenomena such as
colossal magnetoresistance, high temperature superconductivity,
as well as a
remarkable diversity of charge, spin, and orbital ordered phases.
The rich
phase diagrams are determined by the strong local interaction of
electrons
in transition metal $d$ orbitals. Subtle changes in $d$ occupancy
and
overlap---and thereby phase transitions---can be induced by
variations in
temperature, by external fields, through doping and lattice
distortions. In
particular, interfaces can hold surprising electronic and magnetic
properties that differ remarkably from the adjacent layers. Soft
x-ray based
techniques are ideal tools to study these systems as they are
inherently
element-specific, allow characterizing the valence state and the
symmetry of
lattice sites and provide detailed information about the
electronic and
magnetic structure with nanometer spatial resolution and on
ultrafast time
scales. Here we show that the to-date little explored angular
dependence of
the x-ray magnetic dichroism provides unique insights in the
correlation
between atomic, magnetic and electronic structure in these
systems [1-4].
Taking advantage of this approach will prove invaluable for the
engineering
of novel nanoarchitectures to be used in low cost and energy
efficient
devices with improved performance and multiple functionalities.
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[1] G. van der Laan \textit{et al}., Phys. Rev. Lett.
\textbf{105}, 067405 (2010).\\[0pt]
[2] E. Arenholz \textit{et al}., Phys. Rev. B \textbf{82},
140103(R) (2010).\\[0pt]
[3] G. van der Laan \textit{et al}., Phys. Rev. Lett.
\textbf{100}, 067403 (2008).\\[0pt]
[4] E. Arenholz \textit{et al}., Phys. Rev. Lett. \textbf{98},
197201 (2007).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.L16.1