Dresden 2017 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 18: Multiferroics (DF and MA)
DF 18.2: Talk
Thursday, March 23, 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 Brückel1,2 — 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.