Dresden 2020 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Magnetic Coupling and Anisotropy in Thin Films (joint session MA/DS)

DS 44.6: Vortrag

Freitag, 20. März 2020, 10:45–11:00, HSZ 04

Magnetic structure and coupling phenomena of DyCo alloys — •Dieter Lott¹, Kai Chen², André Philippi-Kobs³, and Valeria Lauter⁴ — ¹Institute of Material Research, Helmholz-Zentrum Geesthacht, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany — ³Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607 Hamburg, Germany — ⁴Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

In the last years, alloys of rare-earth elements and 3d transition metals (RE-TM) became again in the focus of attention due there rich variety of magnetic effects owed to the different anisotropies of both material classes. Despite of their amorphous composition, this material class exhibits complex magnetic ordering resulting into non-collinear spin structures and the occurrence of magnetic chirality effects. Lately, different exchange bias phenomena were discovered in DyCo single films and in heterostructures [1,2]. In a very recent study, the occurrence of skyrmions in a single DyCo film could be observed. The analysis of the magnetic microstructure is one of the important keys for understand the underlying mechanism behind these intriguing phenomena. In this work, we report recent results on DyCo/NiFe thin films investigated via polarized neutron reflectometry. The analysis of the magnetic and chemical depth profiles at different magnetic fields and temperature allows one to gain insights into the coupling mechanism in these heterostructures.