Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 38: Magnetic Nanoparticles

MA 38.6: Talk

Thursday, March 19, 2015, 10:45–11:00, H 0110

Interface strain mediated magnetoelectric coupling in BaTiO3 /Iron oxide nanoparticle composites — •Li-Ming Wang, Oleg Petracic, Emmanuel Kentzinger, and Thomas Brückel — Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich

We demonstrate strain mediated magnetoelectric coupling in a composite consisting of ferrimagnetic iron oxide nanoparticles coupled to a BaTiO3 (BTO) ferroelectric single crystal substrate. We performed measurements of the magnetization as function of the magnetic and electric field and measurements of the magneto-electric AC susceptibility (MEACS) as function of temperature and field. We find jumps in the magnetization at the BTO phase transition temperatures and corresponding peaks in the MEACS signal. An interface strain coupling model is proposed to understand the observed effects. Up to 8%magnetization change is achieved upon the BTO phase transition between orthorhombic and rhombohedral phase. Moreover, an electric field controlled magnetic "hardening effect" is observed from magnetization hysteresis loops. The self-assembly of the nanoparticles on top of the BTO substrate is investigated using grazing incidence small angle X-ray scattering (GISAXS).