Magnetism and thermomagnetic phenomena in iron nitrides.

• Applicant: Dr. Imants Dirba, Ph.D.
• Subject Area: Synthesis and Properties of Functional Materials
• Term: since 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 471878653

The synthesis of iron nitrides, Fe(x)N (x=3-8), phases is a promising way towards magnetic materials from abundant sources. Their magnetically ordered state is stable to high temperatures and exhibits high saturation magnetization, while the coercivity varies depending on the composition and microstructure. In addition, the coupling between the localized moments and spins of charge carriers affects the electrical properties. All this predetermines the focus of the project, both towards the use of magnetic properties of selected Fe(x)N nanoparticles and their biocompatibility for biomedical applications, and towards basic research aimed at optimization of thermo-magnetic properties (anomalous Nernst and spin Seebeck effect) and their application. The materials will be prepared in the form of nanoparticles and thin films. The aim of the project is to optimize the magnetic and thermo-magnetic properties of Fe(x)N depending on the degree of Fe-N disorder, microstructure, and doping with other transition metals. Experimental results will be compared with electronic structure calculations. Synthesis of nanoscale Fe(x)N phases and design of thin films and composite materials will be done. Magneto-transport properties for caloritronics will be investigated, as well as the surface modifications and further functionalization of Fe(x)N particles aiming towards bio-medical applications, will be carried out.

• DFG Programme: Research Grants
• International Connection: Czech Republic
• Cooperation Partner: Professor Dr. Karel Knizek, Ph.D.