Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.49: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Skyrmions close to room-temperature -- epitaxy and magnetism of FeGe thin films — •David Schroeter, Josefin Engelke, and Dirk Menzel — Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany

Non-centrosymmetric chiral magnets in the cubic B20 structure with broken space-inversion symmetry show intriguing properties involving the existence of skyrmions. An application of skyrmions in spintronic devices requires materials with magnetic ordering close to room temperature. Among the chiral B20 magnets, FeGe has the highest ordering temperature (278 K). However, since the synthesis of single crystals is difficult, only very small-sized species of single-crystalline FeGe exist. We have grown FeGe as a thin film on Si(111) substrates using molecular beam epitaxy. The films have been structually characterized by RHEED and AFM. A detailed magnetic characterization has been obtained by SQUID magnetometry. We have investigated the complex magnetic phase diagram in comparison to that of bulk FeGe and explored the modification of the skyrmionic phase under the influence of the reduced dimensionality and the strain in the thin films.