Polarized Raman Scattering Studies of Hexagonal YMnO3 Single Crystal

Multiferroic materials coupled ferromagnetic (or antiferromagnetic) and ferroelectric ordering in a single phase. Hexagonal YMnO₃ is the most studied member of rare earth manganites multiferroic materials, due to its fascinating underlying physics and broad application prospect in magnetic storage media and spintronics. We used Raman spectroscopy to characterize the vibration modes in hexagonal YMnO₃ single crystal grown by optical floating-zone method. The Raman spectroscopies were analyzed in detail in the temperature range from 78 to 313 K. A vibration mode (E₂ at 107 cm^-1) was first discovered experimentally, indicating the high quality of YMnO₃ single crystals. The vibration modes of atoms were confirmed by polarized Raman spectrum analysis.