current research
projects
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1. STEM study of the III-V nitrides
and their alloys using high-resolution ADF imaging and EEL
spectroscopy. Typical specimens are GaN/AlGaN herero- structures,
relaxed and strained InN, AlN/GaN/AlN quantum wells et ct.
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2. Study of the internal structure of
the quantum rods (QRs) such as small-angle rotations and bents between
various sections of the individual CdSe QRs using electron beam
nanodifraction.
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| 3. A new dedicated STEM column
(SuperSTEM) is under construction by the Nion company in collaboration
with this group and the Bleloch team from the Northern
Universities Association of the UK. It includes an aberration corrector
that nulls all axial aberrations up to the fifth order and is intended
for the new era of aberration correction. |
4. Simulations of the electron beam
propagation inside various materials and predictions of the
observations in STEM. The most commonly used method is mulislice
theory. The projects include study of the beam broadening in GaN/AlN
quantum wells, understanding the effects of beam channelling from
single
and multiple atomic columns and related topics.
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5.
Study of the Co/Cu/Co.../Pt magnetic layers for potential application
for current controlled magnetically-based memory elements.
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6. Study of dependence of extinction
distances on STEM probe size.
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