Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Multiferroic Oxide Thin Films and Heterostructures I (joint session KFM/TT/MA)
TT 55.7: Vortrag
Mittwoch, 14. März 2018, 11:30–11:45, EMH 225
Domain engineering in BFO films — •Yeseul Yun1,2, Niranjan Ramakrishnegowda1,2, David Knoche1,2, Daesung Park1,2, and Akash Bhatnagar1,2 — 1Zentrum für Innovationskompetenz SiLi-nano, Halle (Saale), Germany — 2Martin Luther Universität Halle-Wittenberg, Halle (Saale, Germany)
Multiferroic materials have attracted great attention due to their unusual physical properties and potential in device applications. The lead-free bismuth ferrite (BiFeO3) is one of the most promising candidates. The domain structure plays a crucial role in determining ferroelectric and magnetic properties. Domains and domain walls can be modulated by parameters such as epitaxial strain, film thickness, substrate termination and presence of conductive layers.
In this study, we investigate the role of plume-related characteristics in obtaining long range order of ferroelastic domains in BiFeO3 films. BFO/LSMO hetero-structures were fabricated using PLD on STO (001) substrate with different O2 partial pressures. Preferential nucleation and long range ordering of 71∘ domain walls was achieved by varying the plume density, indicating the importance of plasma plume dynamics for the evolution of domain structure in the films. The role of strain and electrostatic energies was also analyzed in conjunction. The thickness of BFO was varied to modulate the extent of strain, while the electrostatic conditions were tuned by the thickness of LSMO.