“…[4][5][6][7][8][9] In addition to the phonons and magnons that reflect the dynamics of the crystal and magnetic structure, BFO exhibits electromagnons, which originate from the spin-lattice coupling. 10,11) These distinctive structures and dynamics have been studied via various experimental methods, such as neutron scattering and diffraction, 5,[12][13][14][15] X-ray diffraction, [16][17][18] specific heat measurement, [19][20][21] NMR, 22,23) terahertz spectroscopy, [24][25][26] pump-probe spectroscopy, 27) and first-principles calculations. [28][29][30] In particular, there have been many reports of Raman spectroscopy 10,11,[31][32][33][34][35][36][37][38] with measuring phonons and magnons.…”