Speaker
Description
The interplay of structural disorder and magnetism in oxide nanoparticles is a fascinating subject of recent interest. The present work reviews magnetic properties of nanoscale magnetoceramics with a variety of structure types (cubic spinel, perovskite, hexagonal structure, double perovskite). The case studies are presented, focusing on recent progress in a fundamental understanding of the structural disorder–magnetism relationships in complex oxide nanoparticles. The far-from-equilibrium structural disorder in iron containing magnetic nanomaterials is studied by means of $^{57}$Fe Mössbauer nuclear probe spectroscopy. The functional behavior of oxide nanoparticles is characterized by SQUID measurements. It is demonstrated that local structural disorder in the nanooxides may result either in an enhancement of magnetic behavior or in its degradation, i.e., in a desired or undesired magnetic property modification, when compared to magnetism of their bulk counterparts.
Acknowledgements
The present work is supported by the Deutsche Forschungsgemeinschaft (project SE 1407/4-2).
