Dr. Karen Voigt
Table of contents
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Dr. Karen Voigt
Medizinische Fakultät Carl Gustav Carus, Allgemeinmedizin
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link to the Chair of General Medicine
RESEARCH FOCUS
- Research on important general medical questions (e.g. somatization disorder from the physician's and patient's perspective, care situation for patients with thyroid diseases, epidemiological studies on consultation occasions and outcomes, health behavior of medical professionals, teaching research)
- Teaching general medicine, teaching basic medical skills, coordination of different cross-sectional areas, interesting elective subjects. For teaching general medical knowledge, we are supported by practicing specialists as teaching physicians
- Promotion of young doctors i.e. support for medical students who are interested in the subject general medicine and the work of family doctors and
- Continuing education and mentoring of young physicians on their way to becoming a specialist in general medicine
CURRICULUM VITAE
Head of Research in General Medicine, Carl Gustav Carus Faculty of Medicine. TU Dresden |
CURRENT PUBLICATIONS
Voigt, K. (Hrsg.): Journal of Public Health.. Heidelberg : Springer (2016)
Voigt, K. (Hrsg.): Journal of Public Health.. Heidelberg : Springer-Verlag (2016)
Voigt, K. (Hrsg.): Prävention und Gesundheitsförderung.. Heidelberg : Springer (2016)
Voigt, K. (Hrsg.): Prävention und Gesundheitsförderung.. Heidelberg : Springer (2016)
CURRENT RESEARCH
structures with very small length scales. The recent development of nanometer-size heterostructures,
such as nano-wires and nano-dots, has proven the potential for their enormous
advantages over traditional materials, despite associated technological challenges. Thus, the
nanoscale structures are the focus of novel material development, and computational approaches
have taken a key role in the exploration of their unique properties and development.
The successes in this field shown for electronic and optoelectronic applications provides the
basis for our proposal to computationally study the nanoscale self-assembly of magnetic dots
during heteroepitaxy.
The ultimate goal of the project is to develop an understanding of the important materials
issues governing nanoscale self-assembly, and to develop models that enable the firstprinciples
design of novel super-high density magnetic storage materials, such as FePt and
CoPt. Current magnetic recording technology is bounded by the superparamagnetic limit
which sets an upper limit for recording density on conventional media which is estimated to
be 300-1000Gb in−2, and will be reached in the near future. One approach to circumvent
superparamagnetism is to create a medium where the number of grains needed to store one
bit can significantly reduced and ultimately one bit of information can be stored on a single
nano-sized island. Such small structures would drastically increase storage density beyond
that achievable by traditional means. Combined with an enhanced magnetic anisotropy by
exploring specific alloys, and new writing concepts magnetic islands could be as small as
5nm, potentially they represent an increase in density by a factor of 100 over traditional
thin film magnetic media. The major challenge in creating such materials is that a regular
pattern of nano-sized magnetic dots is required. For cost-effective processing, some degree
of self-assembly is essential. The understanding of the fundamental phenomena occurring
during heteroepitaxy using computational approaches will facilitate the future development
of processing methods that yield the desired structures.
We propose an integrated approach to examine the self-assembly of nanoscale structures
by joining forces of computational experts from the European Community and the United
States, spanning the atomistic to the continuum scales. The work will involve ab initio calculations
of surface energies, surface stress, and surface diffusion coefficients, as well as statistical
mechanics, mesoscopic and continuum calculations of the evolution of nanostructural
morphology and composition during deposition and annealing, resulting in self-assembly.
By parameter passing, each effort will feed into the other, as the information at the smaller
scale will be employed in the larger scale calculations, enabling us to bridge a wide range
of length and time scales. Using this approach, we can address questions such as how the
interplay between kinetic and thermodynamic effects leads to nanostructure formation and
what the controlling factors of the spatial and size distributions are. Answers to these
questions are not only of fundamental interest but also allow us to provide the integrated
computational models needed to produce large scale self-organized arrays of magnetic dots.
To fulfill this specific tasks we combine modern mathematical tools, like phase-field models,
homogenization techniques and asympthotic expansion with state-of-the-art computational
methods, such as multigrid solvers, adaptive and composite finite elements, parallel kinetic
Monte Carlo simulation and intensive experimental validation on model systems of Fe/Mo
and Fe/W.
structures with very small length scales. The recent development of nanometer-size heterostructures,
such as nano-wires and nano-dots, has proven the potential for their enormous
advantages over traditional materials, despite associated technological challenges. Thus, the
nanoscale structures are the focus of novel material development, and computational approaches
have taken a key role in the exploration of their unique properties and development.
The successes in this field shown for electronic and optoelectronic applications provides the
basis for our proposal to computationally study the nanoscale self-assembly of magnetic dots
during heteroepitaxy.
The ultimate goal of the project is to develop an understanding of the important materials
issues governing nanoscale self-assembly, and to develop models that enable the firstprinciples
design of novel super-high density magnetic storage materials, such as FePt and
CoPt. Current magnetic recording technology is bounded by the superparamagnetic limit
which sets an upper limit for recording density on conventional media which is estimated to
be 300-1000Gb in−2, and will be reached in the near future. One approach to circumvent
superparamagnetism is to create a medium where the number of grains needed to store one
bit can significantly reduced and ultimately one bit of information can be stored on a single
nano-sized island. Such small structures would drastically increase storage density beyond
that achievable by traditional means. Combined with an enhanced magnetic anisotropy by
exploring specific alloys, and new writing concepts magnetic islands could be as small as
5nm, potentially they represent an increase in density by a factor of 100 over traditional
thin film magnetic media. The major challenge in creating such materials is that a regular
pattern of nano-sized magnetic dots is required. For cost-effective processing, some degree
of self-assembly is essential. The understanding of the fundamental phenomena occurring
during heteroepitaxy using computational approaches will facilitate the future development
of processing methods that yield the desired structures.
We propose an integrated approach to examine the self-assembly of nanoscale structures
by joining forces of computational experts from the European Community and the United
States, spanning the atomistic to the continuum scales. The work will involve ab initio calculations
of surface energies, surface stress, and surface diffusion coefficients, as well as statistical
mechanics, mesoscopic and continuum calculations of the evolution of nanostructural
morphology and composition during deposition and annealing, resulting in self-assembly.
By parameter passing, each effort will feed into the other, as the information at the smaller
scale will be employed in the larger scale calculations, enabling us to bridge a wide range
of length and time scales. Using this approach, we can address questions such as how the
interplay between kinetic and thermodynamic effects leads to nanostructure formation and
what the controlling factors of the spatial and size distributions are. Answers to these
questions are not only of fundamental interest but also allow us to provide the integrated
computational models needed to produce large scale self-organized arrays of magnetic dots.
To fulfill this specific tasks we combine modern mathematical tools, like phase-field models,
homogenization techniques and asympthotic expansion with state-of-the-art computational
methods, such as multigrid solvers, adaptive and composite finite elements, parallel kinetic
Monte Carlo simulation and intensive experimental validation on model systems of Fe/Mo
and Fe/W.
- Herr Prof. Dr. rer. nat. habil. Axel Voigt
- Herr Dipl.-Inf. Thomas Witkowski
- Frau PhD Yan-Mei Yu
- Herr Prof. Dr. rer. nat. habil. Axel Voigt
- EU/NSF 6th FP NMP "Computational Materials Research"
- Prof. Tapio Ala-Nissilä, Hellsinki University of Technology (Finnland)
- Dr. Miroslav Kotrla, Academy of Science, Czech Republic (Tschechien)
- Prof. Olivier Fruchart, CNRS (Frankreich)
- Prof. Mark Asta, University of California, Davis (USA)
- Prof. John Lowengrub, University of California, Irvine (USA)
- Prof. Peter Voorhees, Northwestern University (USA)
- Prof. Katsuyo Thornton, University of Michigan, Ann Arbor (USA)