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MA: Fachverband Magnetismus
MA 38: Magnetic Particles / Clusters & Biomagnetism
MA 38.2: Vortrag
Donnerstag, 20. März 2025, 15:30–15:45, H18
Exploring iron nitrides: Insights from Mössbauer spectroscopy — •Lenka Kubíčková1,2, Jaroslav Kohout1, Tomáš Kmječ1, Karel Knížek2, Štefan Hricov2,3, Ondřej Kaman2, Yevhen Ablets4, Robin Kidangan Paul4, Stanislav Mráz5, Jochen Schneider5, Oliver Gutfleisch4, and Imants Dirba4 — 1Faculty of Mathematics and Physics, Charles University, 180 00 Praha 8, Czechia — 2FZU - Institute of Physics of the CAS, 162 00 Praha 6, Czechia — 3Faculty of Science, Charles University, 128 00 Praha 2, Czechia — 4Functional Materials, Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany — 5Materials Chemistry, RWTH Aachen University, 52074 Aachen, Germany
Mössbauer spectroscopy, a powerful tool for probing the local electronic and magnetic properties of materials containing Mössbauer isotopes, will be employed to investigate selected examples of iron nitrides. First, we will show spectra of air-sensitive Fe3N nanoparticles, which exhibit a high degree of structural disorder. Moreover, we will discuss formation of an oxide layer by their passivation, whose nature and extent is difficult to assess from other methods but is crucial for medical applications. Second, conversion-electron Mössbauer spectroscopy (CEMS) of Fe4−xGexN (x = 0, 0.5 and 1) crystalline thin films allows us to determine not only the direction of magnetization in the film of the undoped phase, but also, together with the DFT calculations, position of the Ge atoms in the Fe4N structure. Such local insights are valuable for designing and optimizing iron-based films, e.g., for their magnetic or thermoelectric applications.
Keywords: 57Fe Mössbauer spectroscopy; iron nitride; magnetic nanoparticles; thin layers; hyperfine interactions