Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Poster Session on Ferroic Domain Walls - Multiferroics (jointly with DF, KR, MA)

TT 28.19: Poster

Montag, 16. März 2015, 19:00–21:00, Poster C

Optical properties of Sm-doped BiFeO₃ close to the morphotropic phase boundary — •Florian Burkert¹, Michaela Janowski¹, Xiaohang Zhang², Ichiro Takeuchi², and Christine Kuntscher¹ — ¹Experimentalphysik II, Universität Augsburg, 86159 Augsburg, Germany — ²Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

The perovskite BiFeO₃ is a rare example for a magnetoelectric multiferroic above room temperature. It has been demonstrated on Bi_1−xSm_xFeO₃ thin films that Sm-doping drives BiFeO₃ towards a morphotropic phase boundary with enhanced piezoelectric properties, concomitant with a rhombohedral to pseudo-orthorhombic structural phase transition [1]. We studied the reflectance of a similar, Sm-doped BiFeO₃ thin film in the far-infrared range at room temperature and ambient pressure by means of FTIR spectroscopy. With increasing Sm doping, we observe changes in the phonon spectrum, especially at Sm content around x=0.14, indicating the occurrence of a structural phase transition in agreement with earlier studies.

[1] I. Takeuchi et al., Appl. Phys. Lett. 92, 202904 (2008).