1. Condensed-Matter Physics & Materials Science Seminar

    "Polarized neutron scattering investigations on magneto-electric materials with complex magnetic structures"

    Presented by Kazuhisa Kakurai, Quantum Beam Science Directorate, Japan Atomic Energy Agency, Japan

    Monday, June 10, 2013, 11 am
    Small Seminar Room, Bldg. 510

    Hosted by: John Tranquada

    In studying modern functional materials, one is often confronted with complex spin configurations, for example, non-collinear, incommensurate magnetic structure such as helimagnetic structure as a result of frustrated magnetic interactions. Since the giant functional responses in these materials are direct consequences of these complicated magnetic structures, the detailed knowledge of the structure is mandatory to understand the essence of the magnetic functional materials. In this seminar talk I would like to present some polarized neutron studies on magneto-electric materials with complex magnetic structures. These include investigations on complex multiferroic behaviour in RMn2O5 (R: rare earth elements) compounds, on ferroelectricity induced by a proper screw-type helical ordering in CuFeO2 and on transverse conical structure in hexaferrites showing a route to the possible RT functional multiferroic systems. These invetigations were performed in collaboration with S. Wakimoto, M. Matsuda, M. Takeda, Quantum Beam Science Directorate, Japan Atomic Energy Agency, Japan, N. Terada, H. Kitazawa, National Institute for Materials Science, Tsukuba, Japan, , T. Nakajima, S. Mitsuda, Dep. of Physics, Tokyo University of Science, Japan, S. Ishiwata, D. Okuyama, Y. Taguchi, Y. Tokunaga, Y. Kaneko, Y. Tokura, Cross-Correlated Materials Research Group and Correlated Electron Research Group, RIKEN, Japan, M. Nishi, Institute for Solid State Physics, University of Tokyo, Japan and T. Arima, Department of Advanced Materials Science, University of Tokyo, Japan. The neutron scattering studies were in part supported by the MEXT Grant-in-Aid for Scientific Research on Priority Areas (Grant No.19052004).