title: Study of spin-ordering and spin-reorientation transitions in hexagonal manganites through Raman spectroscopy.
abstract: Spin-wave (magnon) scattering, when clearly observed by Raman spectroscopy, can be simple and powerful for studying magnetic phase transitions. In this paper, we present how to observe magnon scattering clearly by Raman spectroscopy, then apply the Raman method to study spin-ordering and spin-reorientation transitions of hexagonal manganite single crystal and thin films and compare directly with the results of magnetization measurements. Our results show that by choosing strong resonance condition and appropriate polarization configuration, magnon scattering can be clearly observed, and the temperature dependence of magnon scattering can be simple and powerful quantity for investigating spin-ordering as well as spin-reorientation transitions. Especially, the Raman method would be very helpful for investigating the weak spin-reorientation transitions by selectively probing the magnons in the Mn(3+) sublattices, while leaving out the strong effects of paramagnetic moments of the rare earth ions.
authors: School of Science and Laboratory of Optical Information Technology, Wuhan Institute of Technology, Wuhan 430205, China.|Department of Nano Science &Mechanical Engineering and Nanotechnology Research Center, Konkuk University, Chungju 380-701, Korea.
authors: Xiang-Bai
authors: XB
authors: Chen
authors: Department of Physics and Division of Nano-Sciences, Ewha Womans University, Seoul 120-750, Korea.
authors: Nguyen Thi Minh
authors: NT
authors: Hien
authors: Department of Physics and Division of Nano-Sciences, Ewha Womans University, Seoul 120-750, Korea.
authors: Kiok
authors: K
authors: Han
authors: Department of Physics and Division of Nano-Sciences, Ewha Womans University, Seoul 120-750, Korea.
authors: Ji-Yeon
authors: JY
authors: Nam
authors: Department of Physics and Division of Nano-Sciences, Ewha Womans University, Seoul 120-750, Korea.
authors: Nguyen Thi
authors: NT
authors: Huyen
authors: Department of Nano Science &Mechanical Engineering and Nanotechnology Research Center, Konkuk University, Chungju 380-701, Korea.
authors: Seong-Il
authors: SI
authors: Shin
authors: Rutgers Center for Emergent Materials and Department of Physics &Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
authors: Xueyun
authors: X
authors: Wang
authors: Rutgers Center for Emergent Materials and Department of Physics &Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
authors: S W
authors: SW
authors: Cheong
authors: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University (SNU), Seoul 151-742, Republic of Korea.
authors: D
authors: D
authors: Lee
authors: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University (SNU), Seoul 151-742, Republic of Korea.
authors: T W
authors: TW
authors: Noh
authors: School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea.
authors: N H
authors: NH
authors: Sung
authors: School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea.|Department of Photonics and Applied Physics, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea.
authors: B K
authors: BK
authors: Cho
authors: Department of Physics and Division of Nano-Sciences, Ewha Womans University, Seoul 120-750, Korea.
authors: In-Sang
authors: IS
authors: Yang