Speaker
Dr
Mogens Christensen
(Aarhus University)
Description
Permanent magnets are responsible for the inter-conversion between energy in the form of electricity and motion. Therefore development of improved permanent magnets is paramount for a sustainable future.
In recent years the world market for high performance permanent magnets has been dominated by neodymium rare-earth magnets, but unfortunately rare-earth minerals are found only in few geographical areas. This is causing geopolitical and strategic issue and magnetic materials without rare-earth elements are urgently needed. Therefore we are working on designing and producing improved permanent magnetic materials that do not include rare-earth elements.
A good candidate for permanent magnetic applications is SrFe12O19 a ferrimagnetic compound with high coercivity field and a hexagonal symmetry. Supercritical synthesis of SrFe12O19 allows size and shape control of nanoparticles to produce single domain nanoparticles. The produced powders have been characterized by Rietveld analysis refinement of X-ray powder diffraction data. Neutron powder diffraction data is underway to characterize the atomic spin configuration and the effect of particle size.
Primary author
Dr
Mogens Christensen
(Aarhus University)
Co-authors
Espen Boejesen
(Aarhus University)
Matilde Saura
(Aarhus University)
