Control of oxygen octahedral rotation in BiFeO$_{3}$ films using modulation of SrRuO$_{3}$ bottom electrode layer

Oxygen octahedral rotation of multiferroic BiFeO$_3$ (BFO) has attracted great attention due to changes of electrical and magnetic properties. Coupling of octahedral rotation in BFO-bottom electrode layer interface remains unexplored. Recently, there have been reported the control of octahedral rotation in SrRuO$_3$ (SRO) film on SrTiO$_3$ (001) substrate by coherently controlling the oxygen pressure during growth and interfacial coupling [1]. Here we demonstrate that the octahedral rotation of BFO film is changed using tetragonal a$^0$a$^0$c$^-$ tilted-SRO bottom electrodes. In this work, BFO/SRO heterostructure is fabricated to SrTiO$_3$ (001) single crystal substrates by pulsed laser deposition at different oxygen partial pressures. The rotation pattern of FeO$_6$ and the structural symmetry are identified from half-integer reflections using high-resolution X-ray diffraction. The effects depending on octahedral tilting of BFO films on the magnetic and ferroelectric properties will be presented. \\[4pt] [1] Wenlai Lu \textit{et al}., Phys. Rev. B. \textbf{88}, 214115 (2013)