研究者詳細 - 谷口　博基

A domain structure in periodically poled stoichiometric LiNbO3 was observed by confocal micro-Raman scanning spectroscopy. The 180°-domain, which is nominally invisible by Raman scattering due to equivalency of Raman selection rule for adjacent domains, was clearly visualized with a spatial resolution of 460 nm. At domain walls, an enhancement of Raman intensity was observed in optical modes that are closely related to the Nb–O bond, while there was no significant change in Li-ion related modes. Nb–O covalent bonds would be deformed by opposite ferroelectric displacements of ions across domain walls, to modify an electric polarizability of the Nb-ion related modes.

DOI： 10.2109/jcersj2.121.579

Web of Science

Scopus

CiNii Research

Ferroelectricity Driven by Twisting of Silicate Tetrahedral Chains 査読有り

Taniguchi Hiroki, Kuwabara Akihide, Kim Jungeun, Kim Younghun, Moriwake Hiroki, Kim Sungwng, Hoshiyama Takuya, Koyama Tsukasa, Mori Shigeo, Takata Masaki, Hosono Hideo, Inaguma Yoshiyuki, Itoh Mitsuru

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 52 巻 ( 31 ) 頁： 8088 - 8092 2013年7月

Ultrafast Real Space Dynamics of Photoexcited State in a Layered Perovskite-Type Spin Crossover Oxide La1.5Sr0.5CoO4

Okimoto Yoichi, Egawa Tsugumi, Fukaya Ryo, Matsubara Yoshitaka, Yamada Yuki, Yamaya Nao, Ishikawa Tadahiko, Onda Ken, Koshihara Shin-ya, Taniguchi Hiroki, Itoh Mitsuru, Isayama Akira, Sasagawa Takao

Journal of the Physical Society of Japan 82 巻 ( 7 ) 頁： 74721 - 74721 2013年7月

Growth and characterization of Cu2ZnSnS4 single crystals 査読有り

Nagaoka Akira, Yoshino Kenji, Taniguchi Hiroki, Taniyama Tomoyasu, Kakimoto Koichi, Miyake Hideto

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE 210 巻 ( 7 ) 頁： 1328 - 1331 2013年7月

Ultrafast Real Space Dynamics of Photoexcited State in a Layered Perovskite-Type Spin Crossover Oxide La1.5Sr0.5CoO4 査読有り

Yoichi Okimoto, Tsugumi Egawa, Ryo Fukaya, Yoshitaka Matsubara, Yuki Yamada, Nao Yamaya, Tadahiko Ishikawa, Ken Onda, Shin-ya Koshihara, Hiroki Taniguchi, Mitsuru Itoh, Akira Isayama, Takao Sasagawa

Journal of the Physical Society of Japan 82 巻 ( 7 ) 頁： 074721 2013年7月

Electric-voltage control of magnetism in Fe/BaTiO3 heterostructured multiferroics 査読有り

Venkataiah G., Wada E., Taniguchi H., Itoh M., Taniyama T.

JOURNAL OF APPLIED PHYSICS 113 巻 ( 17 ) 頁： 17C701/1 - 3 2013年5月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Journal of Applied Physics

Electric field (E) control of the magnetic anisotropy and coercivity (HC) of a Fe film in Fe/BaTiO3 (BTO) is demonstrated at room temperature in the tetragonal phase of BTO. Polarizing microscopy and x-ray diffraction analysis of BTO (001) surface show distinctly two different regions; one with a1, a2 and c domains separated by 180° and 90° domain boundaries (DBs) (region 1) and the other with a1 domains separated by 180° DBs (region 2). The Fe film on region 1 shows complex magnetic anisotropy with the net magnetic easy axis in between [100] and [110] directions of BTO, while the magnetic anisotropy in region 2 exhibits two fold symmetry with an easy axis along [100]. In applied electric field (±10 kV/cm), the magnetic easy axis of the Fe film in region 1 is switched to the [110] direction of BTO, whereas in region 2 it stays unaffected. The HC versus E curves in region 1 show a butterfly-like behavior, while in region 2 no changes are observed. Also, the HC measured in E ±10 kV/cm at different magnetic field orientations shows dramatic changes in region 1 compared to region 2. The observed electric field dependent magnetic response in both regions can be understood based on the DBs modifications and associated strain effects. © 2013 American Institute of Physics.

DOI： 10.1063/1.4793511

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0003-3683-5416

Comparative study of phase transitions in BaTiO3 thin films grown on (001)- and (110)-oriented SrTiO3 substrate 査読有り

Shimizu Takao, Suwama Dai, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru

JOURNAL OF PHYSICS-CONDENSED MATTER 25 巻 ( 13 ) 2013年4月

Structural Modification and Domain Structure in a BaTiO₃ Film on (110) SrTiO₃

6 巻 ( 1 ) 頁： "015803-1"-"015803-3" 2013年1月

Structural Modification and Domain Structure in a BaTiO3 Film on (110) SrTiO3 査読有り

Shimizu Takao, Suwama Dai, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru

APPLIED PHYSICS EXPRESS 6 巻 ( 1 ) 2013年1月

SrTiO3（110）基板上に成長させたBaTiO3薄膜における特異な構造

清水荘雄, 谷口博基, 谷山智康, 伊藤満

日本結晶学会誌 55 巻 ( 5 ) 頁： 290 - 295 2013年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：日本結晶学会

An unconventional pseudo-tetragonal crystal structure is found in a BaTiO3 epitaxial thin film grown on a （110）SrTiO3 substrate. The unique crystal structure of the BaTiO3 film, which is markedly different from the bulk tetragonal structure, is caused by the nearly uniaxial strain due to the different strain relaxation along ［001］ and ［110］ axes.

DOI： 10.5940/jcrsj.55.290

CiNii Research

High photodegradation efficiency of Rhodamine B catalyzed by bismuth silicate nanoparticles 査読有り

Duan Jiao, Liu Yan, Pan Xiuhong, Zhang Yubo, Yu Jianding, Nakajim Kiyotaka, Taniguchi Hiroki

CATALYSIS COMMUNICATIONS 39 巻頁： 65 - 69 2013年

25pDB-11 Photo-Seebeck properties of Pb_2CrO_5 crystals

Mondal P.S., Okazaki R., Taniguchi H., Terasaki I.

日本物理学会講演概要集 68.2.4 巻 ( 0 ) 頁： 650 2013年

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