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MA: Fachverband Magnetismus

MA 57: Multiferroics (DF and MA)

MA 57.2: Vortrag

Donnerstag, 23. März 2017, 15:15–15:30, WIL B321

Strain and electric-field mediated tuning of magnetism in self-assembled iron oxide nanoparticle - BaTiO₃ composites — •Liming Wang¹, Oleg Petracic¹, Emmanuel Kentzinger¹, Ulrich Rücker¹, Alexandros Koutsioumpas², Stefan Mattauch², Markus Schmitz¹, and Thomas Brückel^1,2 — ¹Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich — ²Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany

We report about the manipulation of magnetism of self-assembled iron oxide nanoparticle (NP) monolayers on top of BaTiO₃ (BTO) single crystals. Magnetoelectric coupling (MEC) as shown in both the magnetization and magneto-electric ac susceptibility (MEACS) measurements is observed. Both the magnetization and MEACS as function of temperature show abrupt jumps at the BTO phase transitions temperatures, which is attributed to strain-mediated MEC from the BTO onto the NPs. We find that a Ti sticking layer and an Au embedding layer play a crucial role to maximize the MEC effect. Moreover, using polarized neutron reflectivity (PNR) we observe a change of the in-depth magnetic scattering length density upon changing an applied electric field. Grazing incident small angle X-ray scattering (GISAXS) and scanning electron microscopy (SEM) confirm a hexagonal close-packed supercrystalline order of the NPs.