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Title: Raman spectroscopy studies of spin-waves in hexagonal manganites Xiang-Bai Chen “Chutian Scholar” Distinguished Professor School of Science and Laboratory of Optical Information Technology Wuhan Institute of Technology Wuhan 430205, China Email: [email protected] Abstract Spin-waves are intriguing to the development of next generation Nano-devices because spin-wave devices operate at a much shorter wavelength than conventional optical devices, and they are compatible with conventional electronic devices. Usually Raman spectroscopy studies of spin-waves are difficult due to weak signal of spin-wave scattering. In this talk, we present systematic Raman studies of spin-waves in hexagonal manganites. We will discuss the techniques how to clearly observe spin-waves by Raman spectroscopy, and how to manipulate the intensity and frequency of spin-waves. Furthermore, through the understanding of spin-waves, Raman spectroscopy studies of spin-ordering, spin-exchange integral, and spin-flipping are discussed.