Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Focus Session: Magnetism in Materials Science: Thermodynamics, Kinetics and Defects II (joint session MM/MA)

MA 13.1: Topical Talk

Montag, 12. März 2018, 15:45–16:15, TC 010

Ferromagnetic Nuclear Resonance for studying defects in multilayers and nanocomposites : Structure and magnetic properties — •Christian Mény — IPCMS, 23 rue du loess 67034, Strasbourg, France

Nuclear Magnetic Resonance in Ferromagnets (also called Ferromagnetic Nuclear Resonance, FNR) is a rather unknown technique. However it can give very unique information in the study of defects in ferromagnetic films, multilayers, and nanocomposites. The yield of FNR experiments is twofold. On one hand the FNR spectrum reflects the distribution of hyperfine fields in the sample and thus gives information about the different chemical configurations and site symmetries in the sample,their structure and their defects (stacking faults, impurities, grain boundaries...). On the other hand the evolution of the spectral shape against the FNR radio frequency field strength probes the magnetic stiffness of the electronic moments around the nucleus site thus providing information comparable to that given by ferromagnetic resonance measurements. Therefore, combining both yields makes it possible to correlate the inhomogeneous magnetic properties of a sample to its different structural components and defects. A general presentation of FNR will be given in the first part of the presentation; the second part will be focused on the study of defects in nanostructures.

Reference: Y.F. Liu, , C. Meny; Sampling the structure and chemical order in assemblies of ferromagnetic nanoparticles by Nuclear Magnetic Resonance. Nat. Commun.7, 11532 (2016); and references therein.