Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Magnetic Materials IV
MA 52.1: Vortrag
Freitag, 4. April 2014, 09:30–09:45, HSZ 403
Reduced Hyperfine Magnetic Field and Spin Reorientation in FeNCN — •Marcus Herlitschke1,2, Ludwig Stork3, Benedikt Klobes1, Andrei Tchougreeff3, Richard Dronskowski3, and Raphael Hermann1,2 — 1Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, D-52425 Jülich (Germany) — 2Faculté des Sciences, Université de Liège, B-4000 Liege (Belgium) — 3Chair of Solid-State and Quantum Chemistry, RWTH Aachen, D-52056 Aachen (Germany)
The novel anti-ferromagnetic compound FeNCN which can be considered the nitrogen containing analogue of iron(II) oxide, FeO, was initially synthesized in 2009 [1,2]. We studied this three-dimensional extended non-oxidic framework comparatively to the related iron monoxide using different nuclear resonant methods and vibrating sample magnetometry. Although our results indicate some similarities between both compounds based on the bonding and the local environment of iron, Fe-57 Mössbauer spectroscopy revealed an interesting and unexpected behavior of the hyperfine parameters below the Néel temperature of 350 K. As expected, the hyperfine magnetic field initially increases with decreasing temperature, but reaches a maximum around 295 K and then starts decreasing. In addition to it, the iron spins rotate away from 90 to 60 degrees relative to the c-axis.
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