Berlin 2008 – scientific programme

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SYNF: Symposium Ferroic materials and novel functionalities

SYNF 1: Ferroic materials and novel functionalities I

SYNF 1.7: Talk

Tuesday, February 26, 2008, 12:00–12:15, A 151

Separation of magnetic and dielectric domains in BiFeO₃ and BiCrO₃ thin films — •Denny Köhler¹, Ulrich Zerweck¹, Christian Loppacher³, Stephan Geprägs², Sebastian Gönnenwein², Rudolf Gross², and Lukas M. Eng¹ — ¹Institut für Angewandte Photophysik, Technische Universität Dresden — ²Walter-Meissner Institut, Bayrische Akademie der Wissenschaften, München — ³Laboratoire de Matériaux et Microélectronique de Provence, Universités Paul Cézanne, Marseille

In our work we present low-temperature noncontact-AFM investigations (nc-AFM) in combination with Kelvin Probe Force Microscopy (KPFM) and Magnetic Force Microscopy (MFM) to investigate the magnetic and ferroelectric properties of BiFeO₃ and BiCrO₃ thin films on the nm length scale. Samples are prepared as described in [1]. Complementary to nc-AFM measurements, Piezoresponse Force Microscopy (PFM) was used to deduce the ferroelectric polarisation of the investigated thin films.

Our experiments show that the separation of magnetic and electrostatic forces is possible by simultaneously running KPFM and MFM, but delicate due to the fact that both interactions are of long range nature. We show the separation of ferroelectric and magnetic domains on both materials and monitored a magnetic phase transition on BiCrO₃.

[1] S. Geprägs et al., Phil. Mag. Lett. 87: 141-147 (2007)