Sep 18 – 20, 2013
Paul Scherrer Institut, Villigen, Switzerland
Europe/Zurich timezone

XMCD/XLD Study of the Magnetoelectric Coupling Mechanism in the Multiferroic Composite Co/PMN-PT(011)

Sep 19, 2013, 11:35 AM
15m
WHGA/001 (Paul Scherrer Institut, Villigen, Switzerland)

WHGA/001

Paul Scherrer Institut, Villigen, Switzerland

invited talk Functional Materials

Speaker

Ms Jakoba Heidler (Paul Scherrer Institut, SLS, SYN)

Description

Multiferroic composites are promising candidates amongst the strategies to achieve electric field control of magnetism. In compounds consisting of ferromagnetic and ferroelectric (FE) layers strain can couple the FE phase via the piezoelectric effect to the magnetic phase employing magnetostriction. [Pb(Mg1/3Nb2/3)O3](1-x)-[PbTiO3]x (PMN-PT) is a relaxor FE with strong piezoelectric properties near the morphotrophic phase boundary x=0.3 [1] - Wu et al. reported on a remanent in-plane FE polarization for PMN-PT (011) in addition to the two out-of- plane polarization directions [2]. The impact of the FE order of PMN-PT (011) on the electronic and atomic structure of a Co top layer is studied using X-ray magnetic circular dichroism (XMCD) and X-ray linear dichrosim (XLD) for Co and Ti respectively. We observe the development of a magnetic easy axis upon rotating the FE polarization to in-plane due to strain-mediated coupling (see Fig. 1, red curve). The data suggest an additional charge driven magnetoelectric coupling due to electron accumulation/depletion at the Co/PMN-PT interface(Fig. 1,green and blue curve). Moreover, the Ti data shows a change in the spectrum with applied voltage which is described with the help of multiplet calculations.

Primary author

Ms Jakoba Heidler (Paul Scherrer Institut, SLS, SYN)

Co-authors

Dr Cathrine Jenkins (Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA) Dr Cinthia Piamonteze (1. Swiss Light Source, Paul Scherrer Institut, CH 5232 Villigen, Switzerland) Dr Elke Arenholz (Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA) Frithjof Nolting (Paul Scherrer Institut) Prof. Harald Brune (École Polytechnique Fédérale de Lausanne, Institute of Condensed Matter Physics, CH-1015 Lausanne, Switzerland) Dr Jan Gui-Hyon Dreiser (1. Swiss Light Source, Paul Scherrer Institut, CH 5232 Villigen, Switzerland) Dr Laura Heyderman (Paul Scherrer Institute) Dr Rajesh Vilas Chopdekar (Department of Chemical Engineering and Materials Science, University of California-Davis,Davis, CA 95616, USA) Dr Stefano Rusponi (École Polytechnique Fédérale de Lausanne, Institute of Condensed Matter Physics, CH-1015 Lausanne, Switzerland)

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