Spin Frustration and Magnetic Ferroelectricity

2011 Fiscal Year Final Research Report

• Project Area: Novel States of Matter Induced by Frustration
• Project/Area Number: 19052001
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo (2010-2011); Tohoku University (2007-2009)
• Principal Investigator: ARIMA Taka-hisa 東京大学, 大学院・新領域創成科学研究科, 教授 (90232066)
• Co-Investigator(Kenkyū-buntansha): NODA Yukio 東北大学, 多元物質科学研究所, 教授 (80127274) ; ISHIHARA Sumio 東北大学, 大学院・理学研究科, 教授 (30292262) ; KAJIMOTO Ryoichi 独立行政法人日本原子力研究開発機構, 量子ビーム応用研究部門, 研究員 (30391254)
• Co-Investigator(Renkei-kenkyūsha): KIMURA Tsuyoshi 大阪大学, 大学院・基礎工学研究科, 教授 (80323525) ; SAGAYAMA Hajime 東京大学, 大学院・新領域創成科学研究科, 助教 (90436171) ; ABE Nobuyuki 東京大学, 大学院・新領域創成科学研究科, 助教 (70582005)
• Project Period (FY): 2007 – 2011
• Keywords: 強相関電子系 / 磁気記録 / 磁性 / 低温物性 / 強誘電体物性

Research Abstract

Many accomplishments on magnetic ferroelectrics have been obtained. The mechanism of magnetic-field-induced 90-degree rotation of electric polarization has been elucidated by experimental and theoretical investigations. Based on the knowledge, new magnetic ferroelectrics including a room-temperature multiferroic have been developed. As for the giant magneto-electric effects, the reversal in electric polarization induced by a fine tuning of magnetic field direction has been achieved. We have also succeeded in controlling the magnetization direction in CuB_2O_4 as well as the helicity in several helimagnets with the application of an electric field. The low-energy excitation in a representative spin-driven ferroelectric TbMnO_3 has been also studied by inelastic x-ray and neutron scattering as well as THz-light absorption, which provides useful information about the electro-magnons. Through theoretical studies, we propose a new mechanism of spin-driven ferroelectricity. We have also found a strong coupling between spin and ferroelectricity in a triangular lattice with charge-order instability.

Research Products

• [Journal Article] Magnetic shape memory effect in orbital-spin-coupled system MnV2O4 (2012)
  • Author(s): Y. Nii, N. Abe, K. Taniguchi, T. Arima
  • Journal Title: Appl. Phys. Lett. Volume: 100 Pages: 051905/1-051905/3
  • Peer Reviewed
• [Journal Article] Orbital Compass Model as an Itinerant Electron System (2012)
  • Author(s): J. Nasu and S. Ishihara
  • Journal Title: Europhys. Lett. Volume: 97 Pages: 027002/1-027002/6
  • Peer Reviewed
• [Journal Article] Structural and Magnetic Phase Determination of (1-x)BiFeO3-xBaTiO3 Solid Solution (2012)
  • Author(s): R. Kiyanagi, T. Yamazaki, Y. Sakamoto, H. Kimura, Y. Noda, K. Ohyama, S. Torii, M. Yonemura, Junrong Zhang, T. Kamiyama
  • Journal Title: J. Phys. Soc. Jpn. Volume: 81 Pages: 024603/1-024603/6
  • Peer Reviewed
• [Journal Article] Magnetoelectric Effect in an XY-like Spin Glass System NixMn1-xTiO3 (2012)
  • Author(s): Y. Yamaguchi, T. Nakano, Y. Nozue, T. Kimura
  • Journal Title: Phys. Rev. Lett. Pages: 057203/1-057203/4
  • Peer Reviewed
• [Journal Article] Magnetic-field effects on Jahn-Teller distortion in ferroelastic magnetic insulator Fe1-xMnxCr2O4 (2011)
  • Author(s): H. Sagayama, S. Ohtani, M. Saito, N. Abe, K. Taniguchi, T. Arima
  • Journal Title: Appl. Phys. Lett. Volume: 99 Pages: 082506/1-082506/3
  • Peer Reviewed
• [Journal Article] 6.Magnetic domain structure in the orbital-spin-coupled system MnV2O4 (2011)
  • Author(s): Y. Murakami, Y. Nii, T. Arima, D. Shindo, K. Yanagisawa, A. Tonomura
  • Journal Title: Phys. Rev. Volume: B 84 Pages: 054421/1-054421/5
  • Peer Reviewed
• [Journal Article] Magnetic Phase Transitions and Magnetic-Field-Induced Polarization Flops in Multiferroic YbMn2O5 (2011)
  • Author(s): M. Fukunaga, Y. Sakamoto, H. Kimura, Y. Noda
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80 Pages: 014705/1-014705/5
  • Peer Reviewed
• [Journal Article] Magnetoelectric Feedback among Magnetic Order, Polarization, and Lattice in Multiferroic BiFeO3 (2011)
  • Author(s): Junghwan Park, Sang-Hyun Lee, Seongsu Lee, F. Gozzo, H. Kimura, Y. Noda, Y. J. Choi, V. Kiryukhin, Sang-Wook Cheong, Younjung Jo, Eun Sang Choi, L. Balicas, Gun Sang Jeon, Je-Geun Park
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80 Pages: 114714/1-114714/6
  • Peer Reviewed
• [Journal Article] Spin-chiral domains in Ba0.5Sr1.5Zn2Fe12O22 observed by scanning resonant x-ray microdiffraction (2011)
  • Author(s): Y. Hiraoka, Y. Tanaka, T. Kojima, Y. Takata, M. Oura, Y. Senba, H. Ohashi, Y. Wakabayashi, S. Shin, T. Kimura
  • Journal Title: Phys. Rev. Volume: B 84 Pages: 064418/1-064418/7
  • Peer Reviewed
• [Journal Article] Magnetism and magnetoelectricity of a U-type hexaferrite Sr4Co2Fe36O60 (2011)
  • Author(s): K. Okumura, T. Ishikura, M. Soda, T. Asaka, H. Nakamura, Y. Wakabayashi, T. Kimura
  • Journal Title: Appl. Phys. Lett. Volume: 98 Pages: 212504/1-212504/3
  • Peer Reviewed
• [Journal Article] Ring-Exchange Interaction in Doubly Degenerate Orbital System (2011)
  • Author(s): J. Nasu and S. Ishihara
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80 Pages: 033704/1-033704/4
  • Peer Reviewed
• [Journal Article] Spin-Driven Ferroelectricity and Magneto-Electric Effects in Frustrated Magnetic Systems (2011)
  • Author(s): T. Arima
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80 Pages: 052001/1-052001/14
  • Peer Reviewed
• [Journal Article] Stepwise Neutral-Ionic Phase Transitions in a Covalently Bonded Donor / Acceptor Chain Compound (2011)
  • Author(s): H. Miyasaka, N. Motokawa, T. Chiyo, M. Takemura, M. Yamashita, H. Sagayama, T. Arima
  • Journal Title: J. Am. Chem. Soc. Volume: 133 Pages: 5338-5345
  • Peer Reviewed
• [Journal Article] Magnetic Phase Transitions and Magnetic -Field -Induced Polarization Flops in Multiferroic YbMn2O5 (2011)
  • Author(s): M. Fukunaga, Y. Sakamoto, H. Kimura, and Y. Noda
  • Journal Title: J. Phys. Soc. Jpn Volume: 80 Pages: 014705/1-014705/4
  • Peer Reviewed
• [Journal Article] Correlation between the mobility of domain wall and polarization flop direction in a slanted magnetic field in the helimagnetic ferroelectrics Tb1-xDyxMnO3 (2011)
  • Author(s): N. Abe, K. Taniguchi, H. Sagayama, H. Umetsu, T. Arima
  • Journal Title: Phys. Rev. Volume: B 83 Pages: 060403R/1-060403R/4
  • Peer Reviewed
• [Journal Article] Classification and Interpretation of the Polarization of Multiferroic RMn2O5 (2010)
  • Author(s): M. Fukunaga and Y. Noda
  • Journal Title: J. Phys. Soc. Jpn Volume: 79 Pages: 054705/1-054705/5
  • Peer Reviewed
• [Journal Article] Low-field magnetoelectric effect at room temperature (2010)
  • Author(s): Y. Kitagawa, Y. Hiraoka, T. Honda, T. Ishikura, H. Nakamura, and T. Kimura
  • Journal Title: Nature Mater. Volume: 9 Pages: 797-802
  • Peer Reviewed
• [Journal Article] Multiferroic M-type hexaferrites with a room-temperature conical state and magnetically controllable spin helicity (2010)
  • Author(s): Y. Tokunaga, Y. Kaneko, D. Okuyama, S. Ishiwata, T. Arima, S. Wakimoto, K. Kakurai, Y. Taguchi, Y. Tokura
  • Journal Title: Phys. Rev. Lett. Volume: 105 Pages: 257201/1-257201/4
  • Peer Reviewed
• [Journal Article] Quantum Dielectric Fluctuation in an Electronic Ferroelectricity studied by Variational Monte-Carlo Method (2010)
  • Author(s): T. Watanabe, and S. Ishihara
  • Journal Title: Phys. Soc. Jpn. Volume: 79 Pages: 114714
  • Peer Reviewed
• [Journal Article] Orbital dilution effect in ferrimagnetic Fe1-xMnxCr2O4: competition between anharmonic lattice potential and spin-orbit coupling (2010)
  • Author(s): S. Ohtani, Y. Watanabe, M. Saito, N. Abe, K. Taniguchi, H. Sagayama, T. Arima, M. Watanabe, Y. Noda
  • Journal Title: J. Phys.: Cond. Matt. Volume: 22 Pages: 176003/1-176003/6
  • Peer Reviewed
• [Journal Article] Observation of Spin Helicity Using Nonresonant Circularly Polarized X-ray Diffraction Analysis (2010)
  • Author(s): H. Sagayama, N. Abe, K. Taniguchi, T. Arima, Y. Yamasaki, D. Okuyama, Y. Tokura, S. Sakai, T. Morita, T. Komesu, H. Ohsumi, M. Takata
  • Journal Title: J. Phys. Soc. Jpn. Volume: 79 Pages: 043711/1-043711/4
  • Peer Reviewed
• [Journal Article] Electronic Ferroelectricity in a Dimer Mott Insulator (2010)
  • Author(s): M. Naka, S. Ishihara
  • Journal Title: J. Phys. Soc. Jpn. Volume: 79 Pages: 063707/1-063707/4
  • Peer Reviewed
• [Journal Article] Electronic ferroelectricity and frustration (2010)
  • Author(s): S. Ishihara
  • Journal Title: J. Phys. Soc. Jpn. Volume: 79 Pages: 011010
  • Peer Reviewed
• [Journal Article] Optical imaging of coexisting collinear and spiral spin phases in the magnetoelectric multiferroic MnWO4 (2010)
  • Author(s): K. Taniguchi, M. Saito, T. Arima
  • Journal Title: Phys. Rev. Volume: B 81 Pages: 064406/1-064406/4
  • Peer Reviewed
• [Journal Article] Quantum fluctuation and geometrical frustration effects on electric polarization (2009)
  • Author(s): T. Watanabe, and S. Ishihara
  • Journal Title: J. Phys. Soc. Jpn. Volume: 78 Pages: 113702
  • Peer Reviewed
• [Journal Article] Two distinct ferroelectric phases in the multiferroic Y-type hexaferrite Ba2Mg2Fe12O22 (2009)
  • Author(s): H. Sagayama, K. Taniguchi, N. Abe, T. Arima, Y. Nishikawa, S. Yano, Y. Kousaka, J. Akimitsu, M. Matsuura, and K. Hirota
  • Journal Title: Phys. Rev. Volume: B 80 Pages: 180419R/1-180419R/4
  • Peer Reviewed
• [Journal Article] Lattice Distortion Coupled with Magnetic Ordering in a Triangular Lattice Antiferromagnet CuCrO2 (2009)
  • Author(s): K. Kimura, T. Otani, H. Nakamura, Y. Wakabayashi, and T. Kimura
  • Journal Title: J. Phys. Soc. Jpn. Volume: 78 Pages: 113710/1-113710/4
  • Peer Reviewed
• [Journal Article] Anomalous induction of ferroelectric polarization by magnetization reversal in the phase-separated multiferroic manganite Eu0.8Y0.2MnO3 (2009)
  • Author(s): S. Danjoh, J.-S. Jung, H. Nakamura, Y. Wakabayashi, and T. Kimura
  • Journal Title: Phys. Rev. Volume: B 80 Pages: 180408R/1-180408R/4
  • Peer Reviewed
• [Journal Article] Magnetic-Field-Induced Polarization Flop in Multiferroic TmMn2O5 (2009)
  • Author(s): M. Fukunaga, Y. Sakamoto, H. Kimura, Y. Noda, N. Abe, K. Taniguchi, T. Arima, S. Wakimoto, M. Takeda, K. Kakurai, and K. Kohn
  • Journal Title: Phys. Rev. Lett. Volume: 103 Pages: 077204/1-077204/4
  • Peer Reviewed
• [Journal Article] Spin-driven ferroelectricity in the multiferroic compounds of RMn2O5 (2009)
  • Author(s): H. Kimura, Y. Noda, and K. Kohn
  • Journal Title: J. Mag. Mag. Mat. Volume: 321 Pages: 854-857
  • Peer Reviewed
• [Journal Article] Improvement of the Double-Wave Method for Ferroelectric Hysteresis Loops and Application to Multiferroic RMn2O5 (2009)
  • Author(s): M. Fukunaga and Y. Noda
  • Journal Title: J. Korean Phys. Soc. Volume: 55 (2) Pages: 888-892
  • Peer Reviewed
• [Journal Article] Periodic rotation of magnetization in a non-centrosymmetric soft magnet induced by an electric field (2009)
  • Author(s): M. Saito, K. Ishikawa, S. Konno, K. Taniguchi, T. Arima
  • Journal Title: Nature Materials Volume: 8 Pages: 634-638
  • Peer Reviewed
• [Journal Article] Composite domain walls in a multiferroic perovskite ferrite (2009)
  • Author(s): Y. Tokunaga, N. Furukawa, H. Sakai, Y. Taguchi, T. Arima, Y. Tokura
  • Journal Title: Nature Materials Volume: 8 Pages: 558-562
  • Peer Reviewed
• [Journal Article] Control of the polarization flop direction by a tilted magnetic field in multiferroic TbMnO3 (2009)
  • Author(s): N. Abe, K. Taniguchi, S. Ohtani, H. Umetsu, T. Arima
  • Journal Title: Phys. Rev. Volume: B 80 Pages: 020402R/1-020402R/4
  • Peer Reviewed
• [Journal Article] Unconventional Ferroelectric Transition in the Multiferroic Compound TbMnO3 Revealed by the Absence of an Anomaly in c-Polarized Phonon Dispersion (2009)
  • Author(s): R. Kajimoto, H. Sagayama, K. Sasai, T. Fukuda, S. Tsutsui, T. Arima, K. Hirota, Y. Mitsui, H. Yoshizawa, A. Q. R. Baron, Y. Yamasaki, Y. Tokura
  • Journal Title: Phys. Rev. Lett. Volume: 102 Pages: 247602/1-247602/14
  • Peer Reviewed
• [Journal Article] Magnetic-Field-Induced Magnetic Phase Transitions Associated with Ferroelectricity in Multiferroic ErMn2O5 (2009)
  • Author(s): H. Kimura, S. Wakimoto, M. Fukunaga, Y. Noda, K. Kaneko, N. Metoki, K. Kakurai, and K. Kohn
  • Journal Title: J. Phys. Soc. Jpn Volume: 78 Pages: 034718/1-034718/5
  • Peer Reviewed
• [Journal Article] Magnetoelectric Memory Effect of the Nonpolar Phase with Collinear Spin Structure in Multiferroic MnWO4 (2009)
  • Author(s): K. Taniguchi, N. Abe, S. Ohtani, and T. Arima
  • Journal Title: Phys. Rev. Lett. Volume: 102 Pages: 147201/1-147201/4
  • Peer Reviewed
• [Journal Article] Phase-Sensitive Observation of a Spin-Orbital Mott State in Sr2IrO4 (2009)
  • Author(s): B. J. Kim, H. Ohsumi, T. Komesu, S. Sakai, T. Morita, H. Takagi, T. Arima
  • Journal Title: Science Volume: 323 Pages: 1329-1332
  • Peer Reviewed
• [Journal Article] Dilution effect in correlated electron systems with orbital degeneracy (2009)
  • Author(s): T. Tanaka and S. Ishihara
  • Journal Title: Phys. Rev. Volume: B 79 Pages: 035109/1-035109/11
  • Peer Reviewed
• [Journal Article] Magnetically Controllable CuB2O4 Phase Retarder (2008)
  • Author(s): M. Saito, K. Ishikawa, K. Taniguchi, T. Arima
  • Journal Title: Appl. Phys. Express Volume: 1 Pages: 121302/1-121302/3
  • Peer Reviewed
• [Journal Article] Control of the Magnetoelectric Domain-Wall Stability by a Magnetic Field in a Multiferroic MnWO4 (2008)
  • Author(s): K. Taniguchi, N. Abe, H. Umetsu, H. Aruga Katori, T. Arima
  • Journal Title: Phys. Rev. Lett. Volume: 101 Pages: 207205/1-207205/4
  • Peer Reviewed
• [Journal Article] Magneto-electric optics in non-centrosymmetric ferromagnets (2008)
  • Author(s): T. Arima
  • Journal Title: J. Phys.: Cond. Matter Volume: 20 Pages: 434211/1-434211/9
  • Peer Reviewed
• [Journal Article] Magnetic Control of Crystal Chirality and the Existence of a Large Magneto-Optical Dichroism Effect in CuB2O4 (2008)
  • Author(s): M. Saito, K. Ishikawa, K. Taniguchi, and T. Arima
  • Journal Title: Phys. Rev. Lett. Volume: 101 Pages: 117402/1-117402/4
  • Peer Reviewed
• [Journal Article] Correlation between ferroelectric polarization and sense of helical spin order in multiferroic MnWO4 (2008)
  • Author(s): H. Sagayama, K. Taniguchi, N. Abe, T. Arima, M. Soda, M. Matsuura, and K. Hirota
  • Journal Title: Phys. Rev. Volume: B 77 Pages: 220407R/1-220407R/4
  • Peer Reviewed
• [Journal Article] Giant magneto-elastic coupling in multiferroic hexagonal manganites (2008)
  • Author(s): Seongsu Lee, A. Pirogov, Misun Kang, Kwang-Hyun Jang, M. Yonemura, T. Kamiyama, S.-W. Cheong, F. Gozzo, Namsoo Shin, H. Kimura, Y. Noda and J.-G. Park
  • Journal Title: Nature Volume: 451 Pages: 805-808
  • Peer Reviewed
• [Journal Article] New Technique for Measuring Ferroelectric and Antiferroelectric Hysteresis Loops (2008)
  • Author(s): M. Fukunaga and Y. Noda
  • Journal Title: J. Phys. Soc. Jpn Volume: 77 Pages: 064706/1-064706/5
  • Peer Reviewed
• [Journal Article] Pressure-induced commensurate magnetic order in multiferroic HoMn2O5 (2008)
  • Author(s): H. Kimura, K. Nishihata, Y. Noda, N. Aso, K. Matsubayashi, Y. Uwatoko, and T. Fujiwara
  • Journal Title: J. Phys. Soc. Jpn Volume: 77 Pages: 063704/1-063704/4
  • Peer Reviewed
• [Journal Article] Cycloidal Spin Order in the a-axis Polarized Ferroelectric Phase of Orthorhombic Perovskite Manganite (2008)
  • Author(s): Y. Yamasaki, H. Sagayama, N. Abe, T. Arima, K. Sasai, M. Matsuura, K. Hirota, D. Okuyama, Y. Noda and Y. Tokura
  • Journal Title: Phys. Rev. Lett. Volume: 101 Pages: 097204/1-097204/4
  • Peer Reviewed
• [Journal Article] Discovery of Polarization Flop Transition and Simultaneous Measurements of Magnetic Ordering and Dielectric Properties of TmMn2O5 (2008)
  • Author(s): M. Fukunaga, K. Nishihata, H. Kimura, Y. Noda, and K. Kohn
  • Journal Title: J. Phys. Soc. Jpn Volume: 77 Pages: 094711/1-094711/7
  • Peer Reviewed
• [Journal Article] Magnetic and ferroelectric properties of multiferroic RMn2O5 (2008)
  • Author(s): Y. Noda, H. Kimura, M. Fukunaga, S. Kobayashi, I. Kagomiya and K. Kohn
  • Journal Title: J. Phys.: Condens. Matter Volume: 20 Pages: 434206/1-434206/13
  • Peer Reviewed
• [Journal Article] Numerical study of t2g orbital system with ferromagnetic polarization (2008)
  • Author(s): T. Tanaka and S. Ishihara
  • Journal Title: Phys. Rev. Volume: B 78 Pages: 153106
  • Peer Reviewed
• [Journal Article] Magneto-dielectric phenomana in charge and spin frustrated system of layered iron oxide (2008)
  • Author(s): J. Nasu, A. Nagano, M. Naka and S. Ishihara
  • Journal Title: Phys. Rev. Volume: B 78 Pages: 024416/1-024416/12
  • Peer Reviewed
• [Journal Article] Magneto-dielectric phenomana in charge and spin frustrated system of layered iron oxide (2008)
  • Author(s): M. Naka, A. Nagano, and S. Ishihara
  • Journal Title: Phys. Rev. Volume: B 77 Pages: 224441/1-224441/15
  • Peer Reviewed
• [Journal Article] New Technique for Measuring Ferroelectric and Antiferroelectric Hysteresis Loops (2008)
  • Author(s): M. Fukunaga and Y. Noda
  • Journal Title: J. Phys. Soc. Jpn. Volume: 77 Pages: 064706/1-064706/4
  • Peer Reviewed
• [Journal Article] Pressure-induced commensurate magnetic order in multiferroic HoMn2O5 (2008)
  • Author(s): H. Kimura, K.Nishihata, Y. Noda, N. Aso, K. Matsubayashi, Y. Uwatoko, and T.Fujiwara
  • Journal Title: J. Phys. Soc. Jpn. Volume: 77 Pages: 063704/1-063704/4
  • Peer Reviewed
• [Journal Article] Ferroelectric Polarization Reversal by a Magnetic Field in Multiferroic Y-type Hexaferrite Ba2Mg2Fe12O22 (2008)
  • Author(s): K. Taniguchi, N. Abe, S. Ohtani, H. Umetsu, and T. Arima
  • Journal Title: Appl. Phys. Express Volume: 1 Pages: 031301/1-031301/3
  • Peer Reviewed
• [Journal Article] Magnetic-field dependence of the ferroelectric polarization and spin-lattice coupling in multiferroic MnWO4 (2008)
  • Author(s): K. Taniguchi, N. Abe, H. Sagayama, S. Ohtani, T. Takenobu, Y. Iwasa, and T. Arima
  • Journal Title: Phys. Rev. Volume: B 77 Pages: 064408/1-064408/7
  • Peer Reviewed
• [Journal Article] Giant magneto- ela stic coupling in multiferroic hexagonal manganites (2008)
  • Author(s): Seongsu Lee, A. Pirogov, Misun Kang, Kwang-Hyun Jang, M. Yonemura, T. Kamiyama, S.-W. Cheong, F. Gozzo, Namsoo Shin, H. Kimura, Y. Noda & J.-G. Park
  • Journal Title: Nature Volume: 451 Pages: 805-808
  • Peer Reviewed
• [Journal Article] Gigantic Optical Magnetoelectric Effect in CuB2O4 (2008)
  • Author(s): M. Saito, K. Taniguchi, and T. Arima
  • Journal Title: J. Phys. Soc. Jpn. Volume: 77 Pages: 013705/1-013705/4
  • Peer Reviewed
• [Journal Article] Polarization Reversal in Multiferroic TbMnO3 with a Rotating Magnetic Field Direction (2007)
  • Author(s): N. Abe, K. Taniguchi, S. Ohtani, T. Takenobu, Y. Iwasa, and T. Arima
  • Journal Title: Phys. Rev. Lett. Volume: 99 Pages: 227206/1-227206/4
  • Peer Reviewed
• [Presentation] Magnetoelectric Effects and Related Phenomena in Spin-spiral Hexaferrites (2012)
  • Author(s): T. Kimura
  • Organizer: 2012 American Physical Society March Meeting
  • Place of Presentation: Boston, MA, USA(Invited)
  • Year and Date: 2012-03-01
• [Presentation] Orbital and Frustration (2011)
  • Author(s): S. Ishihara
  • Organizer: Novel Quantum States in Condensed Matter: Correlation, Frustration and Topology (NQS2011)
  • Place of Presentation: Kyoto, Japan(invited)
  • Year and Date: 2011-11-07
• [Presentation] Neutron and x-ray studies of spin-helix-driven ferroelectrics (2011)
  • Author(s): T. Arima
  • Organizer: The International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011
  • Place of Presentation: Tokai, Japan(invited)
  • Year and Date: 2011-02-23
• [Presentation] The Validity of Neutron Magnetic and Crystal Structure Analysis Using Single Crystals on Material Science (2010)
  • Author(s): Y. Noda
  • Organizer: Advanced structure analysis and characterization of ceramic materials (ICC3)
  • Place of Presentation: Osaka, Japan(Invited)
  • Year and Date: 2010-11-16
• [Presentation] Electric control of magnetization in a magnet with D_<2d> symmetry (2010)
  • Author(s): T. Arima
  • Organizer: 55th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Atlanta, USA(invited)
  • Year and Date: 2010-11-15
• [Presentation] Current progress of research on spin-driven ferroelectrics (2010)
  • Author(s): T. Kimura
  • Organizer: Inorganic Materials Conference 2010
  • Place of Presentation: Biarritz, France(Invited)
  • Year and Date: 2010-09-13
• [Presentation] Which Is Major Player, S・S or S x S, in the Ferroelectricity of RMn2O5 ? (2010)
  • Author(s): Y. Noda
  • Organizer: The 8th Japan-Korea Conference on Ferroelectrics (JKC-FE08)
  • Place of Presentation: Egret Himeji, Himeji, Japan(Plenary)
  • Year and Date: 2010-08-04
• [Presentation] Synchrotron X-ray as a Useful Probe for Frustrated Magnets (2010)
  • Author(s): T. Arima
  • Organizer: Highly Frustrated Magnetism 2010
  • Place of Presentation: Baltimore, USA(invited)
  • Year and Date: 2010-08-04
• [Presentation] Electronic Ferroelectricty in Correlated Electron System (2010)
  • Author(s): S. Ishihara
  • Organizer: The 3rd Emergent Materials Research (EMS)
  • Place of Presentation: POSTECH, Pohang, Korea(Invited)
  • Year and Date: 2010-07-05
• [Presentation] Coexisting of Two Different Mechanisms of Ferroelectricity in Multiferroic RMn2O5 (2010)
  • Author(s): Y. Noda
  • Organizer: The 10th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity (RCBJSF-10)
  • Place of Presentation: Suzukake-Hall, Tokyo Institute of Technology, Yokohama, Japan(Invited)
  • Year and Date: 2010-06-23
• [Presentation] Coupling among magnetic, electrical, and optical properties in CuB_2O_4 (2009)
  • Author(s): T. Arima
  • Organizer: The 6th International Conference on Advanced Materials and Devices (ICAMD 2009)
  • Place of Presentation: Jeju, Korea(invited)
  • Year and Date: 2009-12-09
• [Presentation] Polarized neutron and synchrotron X-ray studies of helimagnetic ferroelectrics (2009)
  • Author(s): T. Arima
  • Organizer: Polarized Neutrons and Synchrotron X-Rays for Magnetism 2009
  • Place of Presentation: Bonn, Germany(invited)
  • Year and Date: 2009-08-03
• [Presentation] New Aspects of Magnetic and Dielectric Behavior of Multiferroic RMn2O5 (2008)
  • Author(s): Y. Noda
  • Organizer: Materials Science & Technology 2008(MS&T08)
  • Place of Presentation: Pittsburgh, Pennsylvania, U.S.A.(Invited)
  • Year and Date: 2008-10-07
• [Presentation] Magnetic and crystal structure in connection with ferroelectric properties of multiferroic RMn2O5 (2008)
  • Author(s): Y. Noda
  • Organizer: The XXI Congress and General Assembly of the International Union of Crystallography
  • Place of Presentation: Osaka, Japan(Invited)
  • Year and Date: 2008-08-29
• [Presentation] Diffraction Studies of Relation between Helicity of Cycloid Magnetism and Ferroelectric Polarization in Multiferroic Manganese Oxides (2007)
  • Author(s): T. Arima
  • Organizer: The 8th Conference of the Asian Crystallographic Association
  • Place of Presentation: Taipei(invited)
  • Year and Date: 2007-11-05
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