Ultrafast magneto-optical spectroscopy of BiFeO3-BaTiO3 based structures

Brenden A. Magill; Michael Bishop; Stephen A. McGill; Yuon Zhou; Anuj Chopra; Deepam Maurya; Hyun-Cheol Song; Shashank Priya; Giti A. Khodaparast

doi:10.1117/12.2185964

8 September 2015 Ultrafast magneto-optical spectroscopy of BiFeO₃-BaTiO₃ based structures

Brenden A. Magill, Michael Bishop, Stephen A. McGill, Yuon Zhou, Anuj Chopra, Deepam Maurya, Hyun-Cheol Song, Shashank Priya, Giti A. Khodaparast

Author Affiliations +

Proceedings Volume 9551, Spintronics VIII; 95510T (2015) https://doi.org/10.1117/12.2185964
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Ultrafast optical spectroscopy can provide insight into fundamental microscopic interactions, dynamics and the coupling of several degrees of freedom. Pump/ probe studies can reveal the answer to questions like “What are the achievable switching speeds in multiferroics?”, “What is the influence of the crystallographic orientation and domain states on the available switching states?”, and “What is the effect of the hetrostructure on promoting the coupling between the varying field excitations?”. In this presentation, we report on two color (400/800nm) ultrafast pump-probe differential reflectance spectroscopy of BiFeO3-BaTiO3 structures to probe the coupling between optical and acoustic phonons to spin waves. The data presented here is a combination of different transient reflectivity measurements to probe both the carrier and spin dynamics. The (001)-BiFeO3-BaTiO3 thin films were prepared using pulsed laser deposition on vicinal SrTiO3 substrates using La0.70 Sr0.30MnO3 bottom electrodes. Crystal orientation and topography were analyzed by x-ray diffraction and atomic force microscopy. . Our results are important to developing devices on the basis of this material system. This work was supported by the AFOSR through grant FA9550-14-1-0376,NSF-Career Award DMR-0846834, and the Virginia Tech Institute for Critical Technology and Applied Science.

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Brenden A. Magill, Michael Bishop, Stephen A. McGill, Yuon Zhou, Anuj Chopra, Deepam Maurya, Hyun-Cheol Song, Shashank Priya, and Giti A. Khodaparast "Ultrafast magneto-optical spectroscopy of BiFeO₃-BaTiO₃ based structures", Proc. SPIE 9551, Spintronics VIII, 95510T (8 September 2015); https://doi.org/10.1117/12.2185964

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