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Synthesis an Orbital magnetism of core-shell nanoparticles

Synthesis an Orbital magnetism of core-shell nanoparticles

Objective

Monodisperse magnetic nanoparticles (3 -200 nm) have a huge potential for applications in medicine like tumor therapy, gene sequencing, contrast agents in magnetic imaging, bio-labeling, or drug delivery agents and also in information technology relevant areas like non-volatile data storage and sensor applications. Most of the magnetic nanoparticles have the disadvantage of either being bio-incompatible or not thermally stable due to too small a magnetic anisotropy energy. The goal of the network is to synthesize and characterize new types of core shell particles (in the size range between 3 and 200 nm) consisting of a magnetic core with a large magnetic anisotropy (e.g. FePt , CoSm) protected by an inert, bio-compatible shell of few atomic layers of noble metals (Au, Ag ,Pt) or iron oxides. Atomic layer control over the shell thickness and the core diameter shall be achieved. The new combination of ferromagnetic core (3d metal) and ferrimagnetic shell materials (e.g. 4f metals or oxides) will yield high coercive nanoparticles which can be used as building blocks for novel magnetic materials. The complex interface and surface magnetism of individual nanoparticles which are unique in terms of their high surface-to-volume and interface-to-volume ratio (r=0.2 to 0.5), will be investigated by ferro-/paramagnetic resonance and magnetic circular dichroism, which allows the determination of element specific magnetic moments and the distinction of orbital contributions from the core, the interfaces or the surface. The results of this basic research will provide a better understanding for the functionalization of the interface properties which control the response of magnetic sensors exchange bias) or the compatibility to medical applications. The added benefit is the focus on the interdisciplinary training in organochemical synthesis of complex nanoparticles, the work at large synchrotron user facilities using unique magnetic and chemical characterization technique

Coordinator

UNIVERSITÄT DUISBURG-ESSEN

Address

Universitaetsstrasse 2
Essen

Germany

Administrative Contact

Michael FARLE (Prof.)

Participants (7)

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ARISTOTLE UNIVERSITY OF THESSALONIKI

Greece

CENTER OF ADVANCED EUROPEAN STUDIES AND RESEARCH

Germany

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE

France

INSTALLATION EUROPÉENNE DE RAYONNEMENT SYNCHROTRON

France

INSTITUTE OF PHYSICS ACADEMY OF SCIENCES OF THE CZECH REPUBLIC

Czechia

MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V

Germany

UNIVERSIDAD DE VIGO

Spain

Project information

Grant agreement ID: 5567

  • Start date

    14 October 2004

  • End date

    14 October 2008

Funded under:

FP6-MOBILITY

Coordinated by:

UNIVERSITÄT DUISBURG-ESSEN

Germany