Ultrafast light-driven simultaneous excitation of coherent terahertz magnons and phonons in multiferroic BiFeO3

• DOI: 10.1103/physrevb.101.134413
• Publication Date: 2020-04-13T17:14:01Z
• Authors: Pritam Khan; Masataka Kanamaru; Keita Matsumoto; Toshimitsu Ito; Takuya Satoh
• Keywords: Magnon

Of late, magnetoelectric multiferroics have gained tremendous importance because they possess coexisting magnetic and ferroelectric phases, with cross-correlation effects between electric degrees of freedom. BiFeO${}_{3}$ stands out as a canonical material in the multiferroics, it exhibits ferroelectricity antiferromagnetism at room temperature. Here, authors demonstrate for first time that linearly polarized ultrafast light pulse leads to simultaneous excitation coherent magnon optical-phonon modes below few terahertz frequency regime. Excitation optical phonon could pave way developing magnetoelectro-optical devices.