Ultrafast Dynamics in Multiferroic BaTiO₃-BiFeO₃ (BTO-BFO) and PZT Nanorods

Multiferroic materials offer unique features, making them ideal candidates for many applications in photonics and spintronics. One such example is a four-state memory, where a reading and writing of a magnetic bit is done by a voltage pulse instead of a magnetic-field, allowing for faster, smaller, and more energy-efficient data-storage technologies. Multiferroic hetrostructures such BaTiO3-BiFeO3 (BT-BFO) and PZT nanorods are promising candidates for these applications as they exhibit enhanced magnetic and ferroelectric properties, improved magnetoelectric coupling, and enhanced switching response of their electrical polarization and magnetic orientations. In this study, we investigate ultrafast optical processes of BT-BFO and PZT nanorods with time resolved pump-probe spectroscopy. We observe tunability in ultrafast Time Resolved Differential Reflectivity (TRDR) dynamics, in a broad optical region (700 nm and 1000 nm). The observed tunability was enhanced by applying magnetic fields where the magneto-electric couplings can play a role.