Regensburg 2013 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 2: Multiferroics 2 (MA jointly with DF, DS, KR, TT)
KR 2.11: Vortrag
Montag, 11. März 2013, 17:45–18:00, H3
Self-assembled composite multiferroic films in controlled strain states — •Mohsin Rafique1,2,3,4, Andreas Herklotz3,4, Er-Jia Guo3,4, Kathrin Doerr3,4, and Sadia Manzoor1,2 — 1Magnetism Laboratory, COMSATS Institute of Information Technology, Park Road 44000, Islamabad, Pakistan — 2Center for Micro and Nano Devices (CMND), COMSATS Institute of Information Technology, Park Road 44000, Islamabad, Pakistan — 3IFW Dresden, Postfach 270116, 01171 Dresden, Germany — 4Institute for Physics, Martin-Luther-University Halle-Wittenberg, 06099 Halle, Germany
Self-assembled thin-film nanocomposites of piezoelectric and magnetostrictive materials have stimulated increasing research activities because of their potential to exhibit a large magnetoelectric response exploitable in multifunctional devices. Epitaxial thin films of CoFe2O4 and BaTiO3 (CFO-BTO) composites were grown on SrTiO3 (001) and piezoelectric Pb(Mg1/3Nb2/3)0.72Ti0.28O3(001) (PMN-PT) substrates by pulsed laser deposition. Self-assembled nanostructures consisting of spinel nanopillars heteroepitaxially embedded in the ferroelectric perovskite matrix form. X-ray diffraction is utilized to estimate the lattice parameters. The magnetic properties studied by SQUID magnetometry show an out-of-plane easy axis of the CFO nanopillars and a strengthening of the out-of-plane anisotropy with increasing compression along the nanopillar axis. The magnetoelectric coupling in the composite film is revealed at a structural transition of the BTO matrix. Electrically controlled substrate strain of PMN-PT is applied to modify the magnetic anisotropy of the nanopillars.