Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 39: Magnetic Particles
MA 39.3: Talk
Thursday, March 10, 2016, 10:00–10:15, H31
Strain and Electric Control of Magnetism in Supercrystalline Iron Oxide Nanoparticle - BaTiO3 composites — •Liming Wang1, Oleg Petracic1, Emmanuel Kentzinger1, Ulrich Rücker1, Alexandros Koutsioumpas2, Stefan Mattauch2, 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, n, Lichtenbergsrtr. 1, Graching
The manipulation of magnetism of self-assembled iron oxide nanoparticle (NP) monolayers on top of BaTiO3 (BTO) single crystals is reported. We observe strain induced magnetoelectric coupling (MEC) as shown by measurements of both the magnetization and magneto-electric ac susceptibility (MEACS). The magnetization, coercivity, remanent magnetization and MEACS signal as function of temperature shows abrupt jumps at the BTO phase transitions temperatures. A magnetic "hardening effect" is observed with variation of strain or electric field. Grazing incident small angle X-ray scattering (GISAXS) and scanning electron microscopy (SEM) confirms a hexagonal close-packed supercrystalline order of the NP monolayers.