The project is directed to magnetic oxides of the (La,Sr)MnO3 perovskite type in the form of isolated nanosized crystallites, high-pressure compacts and sintered nanostructured solids. The research relies on a novel method of synthesis enabling to grow particles in high yield, to vary composition gradient between the inner part and surface layer, as well as to form core/shell composites. The manganites are selected in view of their very rich magnetic phase diagram in dependence on the charge carrier doping that can be efficiently controlled by nominal composition, chemical modification of the particle surface and chemisorption of extra oxygen. We plan to characterize the structure and composition of the grown products using X-ray and neutron diffraction, small angle scattering, electron microscopy and energy dispersive spectroscopy. Static and dynamic magnetic properties will be investigated using DC and AC methods and further probed by incorporation of highly anisotropic rare earth cations in the particles in order to distinguish between the intrinsic and surface related effects.
Magnetism of manganite particles and their formations
Abstract