idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
For the preparation of nanomagnets there are two different approaches.
Bottom up: Synthesis of monodisperse, small particles (2 - 100 nm) by means of organo-metallic and gas phase synthesis or use of self organization processes on the atomic scale.
Top down: Standard thin film deposition techniques in combination with new lithographic techniques as diblock copolymer templates, biological templates (s-layer), alumina templates and nanosphere lithography.
The above mentioned topics are typically covered by researchers from different communities (nanoparticles, thin film magnetism, high resolution imaging, biologic or polymer templates) and therefore the symposium aims at providing an interdisciplinary communication and discussion forum.
1. Magnetic nanoparticles
The investigations of magnetic nanoparticle are mainly addressing materials with relevance to storage technology. These are high anisotropy materials like 4f/3d and L10-ordered FePt nanoparticles. By means of organo-metallic synthesis large quantities of these particles are prepared in colloidal suspensions with a high degree of monodispersity. Such suspensions are used for the periodic arrangement of the nanoparticles on a substrate. The major drawback is however that in order to achieve the L10-order a post deposition annealing step is required. This leads to a sintering of the adjacent particles. Many approaches have been tried in order to reduce the annealing temperature and thereby circumvent the problem of sintering. One approach is the gas phase preparation of such nanoparticles where the thermal treatment can be performed already before deposition. However, no regular arrangement is achieved so far. Similar problems are also inherent to embedded nanoparticles. In the interface between nanoparticles and matrix material plays an important role. Although there are a number of different concepts the technological requirements could not be fulfilled simultaneously so far.
2. Self-organized nanostructures
An alternative approach is the so-called bottom-up approach. Step edges or dislocation networks on single crystal substrates are used for a preferential positioning of atoms during film deposition. Depending on the deposition conditions islands of compact or fractal shape, nanowires or threedimensional islands can be prepared. The magnetic properties of these extremely small nanostructures are the central topic within this session. A detailed analysis of the structure and morphology of these nanostructures is extremely important in order to correlate magnetic properties with single step edge or island atoms.
3. Lithographically prepared nanostructures
In order to push the limits to smaller sizes in recent years the wavelength for conventional lithography has been decreased successively. These techniques become increasingly difficult and expensive at a wavelength of 157 nm since this light is already absorbed by air and thus the lithography has to be performed in vacuum. Therefore alternative approaches have been evaluated. In this session the structural and magnetic properties of nanostructures prepared by novel lithography techniques, like diblock copolymer templates, biological templates, nanosphere lithography and alumina templates, are presented.
4. Novel complex systems
Complex magnetic structures can be tailored due to the use of magnetic building blocks. A variation of composition leads to a modification of magnetic properties like magnetic anisotropy, magnetization or exchange coupling which cannot so easily be achieved by conventional film deposition techniques. The surface of the particles can be controlled and functionalized. These complex systems cover magnetic spheres, carbon nanotubes filled with magnetic material and micelle structures.
Organization of the workshop:
Prof. Dr. Michael Farle
Universität Duisburg-Essen
Fachbereich Physik
Lotharstrasse 1
47048 Duisburg
Tel.: ++49 203 - 3792075
Fax: ++49 203 - 3792098
Priv.-Doz. Dr. Jürgen Fassbender
Forschungszentrum Rossendorf
Institut für Ionenstrahlphysik und Materialforschung
Postfach 51 01 19
01314 Dresden
Tel.: ++ 49 351 - 2603096
Fax: ++ 49 351 - 2603285
Hinweise zur Teilnahme:
We encourage Ph. D. students, post-docs, young and senior scientists to participate and to present their actual research as a poster of short oral contribution. For a limited number of participants the conference fee can be covered by the Heraeus foundation. For participants without contribution the conference fee is 100 €.
Scientists interested in attending the seminar are asked to apply as soon as possible. The number of participants is strictly limited. Note that the number of attendees from one research group should be four at maximum. For your application, please use the form on our www-pages.
Deadline of application: November 14, 2005
Termin:
04.01.2006 - 06.01.2006
Veranstaltungsort:
Physikzentrum Bad Honnef
Hauptstr. 5
53604 Bad Honnef
Sachsen
Deutschland
Zielgruppe:
Wissenschaftler
E-Mail-Adresse:
Relevanz:
international
Sachgebiete:
Biologie, Chemie, Informationstechnik, Mathematik, Physik / Astronomie, Werkstoffwissenschaften
Arten:
Eintrag:
12.10.2005
Absender:
Dr. Christine Bohnet
Abteilung:
Kommunikation und Medien
Veranstaltung ist kostenlos:
nein
Textsprache:
Englisch
URL dieser Veranstaltung: http://idw-online.de/de/event15135
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