Probe of Multifunctionality in BaTiO₃-BiFeO₃ Films and Nanorod Arrays

Multifunctional materials are ushering a new era of revolutionary advances in optoelectronics, spintronics, and in quantum sensing due to their enhanced coupling between electronic, vibrational, and spin degrees of freedom. In this talk, we present several less explored properties of BaTiO₃-BiFeO₃ (BTO-BFO) films and nanorod arrays, including second harmonic generation (SHG) and ferromagnetic resonance (FMR). Aiming for miniaturization and integration on Si chips, beyond commonly used nonlinear materials, we explored SHG using excitation wavelengths ranging from 1000-1050 nm on BTO-BFO films and nano-rod arrays, with different film thicknesses and heights. In addition, we report FMR on the same structures (from 5 to 30 GHz) where the effective Gilbert damping parameter, in the range of 4-7x10^-3, was extracted. The observation of low effective damping indicates that these BTO-BFO systems could be promising for enabling low-loss spin dynamics.