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Search Results: Records 1-20 displayed on this page of 28

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Journal Articles

A Study on convection in molten zone of aluminum alloy during Fe/Al resistance spot welding

Iyota, Muneyoshi*; Matsuda, Tomoki*; Sano, Tomokazu*; Shigeta, Masaya*; Shobu, Takahisa; Yumoto, Hirokatsu*; Koyama, Takahisa*; Yamazaki, Hiroshi*; Semba, Yasunori*; Ohashi, Haruhiko*; et al.

Journal of Manufacturing Processes, 94, p.424 - 434, 2023/05

https://doi.org/10.1016/j.jmapro.2023.03.032
 Times Cited Count：3 Percentile：83.33(Engineering, Manufacturing)

Journal Articles

Uniaxial-pressure control of magnetic phase transitions in a frustrated magnet CuFe$$_{1-x}$$Ga$$_{x}$$O$$_{2}$$ (x =0, 0.018)

Nakajima, Taro*; Mitsuda, Setsuo*; Takahashi, Keiichiro*; Yoshitomi, Keisuke*; Masuda, Kazuya*; Kaneko, Chikafumi*; Homma, Yuki*; Kobayashi, Satoru*; Kitazawa, Hideaki*; Kosaka, Masashi*; et al.

Journal of the Physical Society of Japan, 81(9), p.094710_1 - 094710_8, 2012/09

https://doi.org/10.1143/JPSJ.81.094710

Journal Articles

Uniaxial-pressure control of magnetic phase transitions in a frustrated magnet CuFe$$_{1-x}$$Ga$$_{x}$$O$$_{2}$$ ($$x$$ = 0, 0.018)

Nakajima, Taro*; Mitsuda, Setsuo*; Takahashi, Keiichiro*; Yoshitomi, Keisuke*; Masuda, Kazuya*; Kaneko, Chikafumi*; Homma, Yuki*; Kobayashi, Satoru*; Kitazawa, Hideaki*; Kosaka, Masashi*; et al.

Journal of the Physical Society of Japan, 81(9), p.094710_1 - 094710_8, 2012/09

https://doi.org/10.1143/JPSJ.81.094710
 Times Cited Count：13 Percentile：63.15(Physics, Multidisciplinary)

Journal Articles

Anisotropic spin freezing in lightly-doped La$$_{2-x}$$Sr$$_x$$CuO$$_4$$

Matsuda, Masaaki; Fujita, Masaki*; Takeda, Masayasu; Kakurai, Kazuhisa; Yamada, Kazuyoshi*

Physica C, 470(Suppl.1), p.S82 - S83, 2010/12

https://doi.org/10.1016/j.physc.2009.11.009
 Times Cited Count：1 Percentile：6.46(Physics, Applied)

Journal Articles

Spiral spin structures and origin of the magnetoelectric coupling in YMn$$_2$$O$$_5$$

Kim, J.-H.*; Lee, S.-H.*; Park, S. I.*; Kenzelmann, M.*; Harris, A. B.*; Schefer, J.*; Chung, J.-H.*; Majkrzak, C. F.*; Takeda, Masayasu; Wakimoto, Shuichi; et al.

Physical Review B, 78(24), p.245115_1 - 245115_10, 2008/12

https://doi.org/10.1103/PhysRevB.78.245115
 Times Cited Count：41 Percentile：80.23(Materials Science, Multidisciplinary)

Journal Articles

Spiral spin structure in the Heisenberg pyrochlore magnet CdCr$$_2$$O$$_4$$

Matsuda, Masaaki; Takeda, Masayasu; Nakamura, Mitsutaka; Kakurai, Kazuhisa; Osawa, Akira*; Leli$`e$vre-Berna, E.*; Chung, J.-H.*; Ueda, Hiroaki*; Takagi, Hidenori*; Lee, S.-H.*

Physical Review B, 75(10), p.104415_1 - 104415_6, 2007/03

https://doi.org/10.1103/PhysRevB.75.104415
 Times Cited Count：43 Percentile：81.64(Materials Science, Multidisciplinary)

A frustrated spinel CdCr$$_2$$O$$_4$$ undergoes a three-dimensional spin-Peierls transition at $$T_N$$ = 7.8 K from a cubic paramagnetic to a tetragonal N$'e$el state. The N$'e$el state has a spiral magnetic structure with a characteristic wave vector of $$(0,delta,1)$$ when the $$c$$ axis elongated. Here we report our spherical neutron polarimetry experiments to investigate the spiral spin structure in detail. Our results indicate that the spins lie in the $$ac$$ plane perpendicular to the direction of the spiral modulation. We also found that the spiral structure in the $$ac$$ plane is elliptical with the $$c$$-component larger by $$sim$$24% than the $$a$$-component, suggesting a strong coupling between the magnetic structure and structural distortion. Unpolarized neutron diffraction under an external magnetic field has also been performed. The magnetic field dependence suggests existence of magnetic anisotropy in the N$'e$el state, which is consistent with our previous inelastic studies.

Journal Articles

Polarized neutron scattering study of the CuO$$_{2}$$ chains in Ca$$_{2}$$Y$$_{2}$$Cu$$_{5}$$O$$_{10}$$

Matsuda, Masaaki; Nakamura, Mitsutaka; Takeda, Masayasu*; Kakurai, Kazuhisa; Yamaguchi, Hirotaka*; Ito, Toshimitsu*; Oka, Kunihiko*

Physica B; Condensed Matter, 329-333(1-4), p.711 - 712, 2003/05

https://doi.org/10.1016/S0921-4526(02)02020-3
 Times Cited Count：0 Percentile：0(Physics, Condensed Matter)

no abstracts in English

Journal Articles

ELM control and boundary plasma modification in the JFT-2M tokamak

Tamai, Hiroshi; Shoji, Teruaki; Miura, Yukitoshi; Nagashima, Keisuke; Kawashima, Hisato; Matsuda, Toshiaki; Ogawa, Hiroaki; Maeno, Masaki; Yamauchi, Toshihiko; Uehara, Kazuya; et al.

IAEA-CN-60/A1-7, 0, p.137 - 144, 1995/00

no abstracts in English

Journal Articles

Multi-ampere negative hydrogen ion source for fusion application

Inoue, Takashi; Araki, Masanori; Hanada, Masaya; Kurashima, Toru*; Matsuda, Shinzaburo; *; Ohara, Yoshihiro; Okumura, Yoshikazu; Tanaka, Shigeru; Watanabe, Kazuhiro

Nuclear Instruments and Methods in Physics Research B, 37-38, p.111 - 115, 1989/00

https://doi.org/10.1016/0168-583X(89)90146-8
 Times Cited Count：27 Percentile：91.59(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Multi-ampere H$$^{-}$$beam production in a volume ion source

Watanabe, Kazuhiro; Araki, Masanori; Hanada, Masaya; Horiike, Hiroshi; Inoue, Takashi; Kurashima, Toru*; Matsuda, Shinzaburo; *; Ohara, Yoshihiro; Okumura, Yoshikazu; et al.

12th Symp. on Fusion Engineering, p.302 - 305, 1987/00

no abstracts in English

Oral presentation

Detailed magnetic structure of a frustrated spinel CdCr$$_2$$O$$_4$$ studied by polarized neutron techniques

Matsuda, Masaaki; Osawa, Akira*; Takeda, Masayasu; Kakurai, Kazuhisa; Chung, J.-H.*; Lee, S.-H.*; Ueda, Hiroaki*; Takagi, Hidenori*

no journal, , 

CdCr$$_2$$O$$_4$$ has the spinel structure, in which geometrical frustration exists between the Cr$$^{3+}$$ moments located at the corners of the tetrahedron. It shows an incommensurate antiferromagnetic ordering below $$Trm_N$$=7.8K with a characteristic wave vector of $$Q=(0, delta, 1)$$ ($$deltasim0.09$$). We first performed a 1D polarized neutron analysis and determined that the Cr$$^{3+}$$ moments has a planer anisotropy in the $$ac$$ plane, indicating that the magnetic structure is spiral. Finally, the 3D polarized neutron analysis using a CRYOPAD on TAS-1 at JRR-3 determined that the magnetic structure is elliptical spiral in the $$ac$$ plane with ellipsoid slightly elongated along the $$c$$ axis. The origin of the structure will be discussed.

Oral presentation

Spiral structure of a frustrated spinel CdCr$$_2$$O$$_4$$ studied by polarized neutron techniques

Matsuda, Masaaki; Osawa, Akira*; Takeda, Masayasu; Nakamura, Mitsutaka; Leli$`e$vre-Berna, E.*; Kakurai, Kazuhisa; Chung, J.-H.*; Lee, S.-H.*; Ueda, Hiroaki*; Takagi, Hidenori*

no journal, , 

no abstracts in English

Oral presentation

Magnetic Structure of a Frustrated Spinel CdCr$$_{2}$$O$$_{4}$$

Matsuda, Masaaki; Osawa, Akira*; Takeda, Masayasu; Nakamura, Mitsutaka; Kakurai, Kazuhisa; Leli$`e$vre-Berna, E.*; Chung, J.-H.*; Lee, S.-H.*; Ueda, Hiroaki*; Takagi, Hidenori*

no journal, , 

no abstracts in English

Oral presentation

Magnetic structure of TbMnO$$_3$$ studied with spherical neutron polarimetry

Kajimoto, Ryoichi; Matsuda, Masaaki; Takeda, Masayasu; Kakurai, Kazuhisa; Mitsui, Yukari*; Yoshizawa, Hideki*; Kimura, Tsuyoshi*; Tokura, Yoshinori*

no journal, , 

no abstracts in English

Oral presentation

Polarized neutron scattering study of spin dynamics in La$$_{2-x}$$(Sr,Ba)$$_{x}$$CuO$$_{4}$$

Wakimoto, Shuichi; Kakurai, Kazuhisa; Matsuda, Masaaki; Takeda, Masayasu; Fujita, Masaki*; Yamada, Kazuyoshi*; Gu, G.*; Tranquada, J. M.*; Birgeneau, R. J.*; Zhang, H.*

no journal, , 

Polarized neutron scattering exaperiments have been performed on La$$_{1.875}$$Ba$$_{0.125}$$CuO$$_{4}$$ and La$$_{1.92}$$Sr$$_{0.08}$$CuO$$_{4}$$ with intent to elucidate a possible effects of stripe structure to the spin dynamics. Low energy ($$omega = 4$$ meV) data demonstratre that in the former sample, which has a well-ordered stripe state with Cu spins lying in the CuO$$_2$$ plane at 10 K, spins fluctuate only in the plane. On the other hand, the latter sample, which has very weak stripe order, shows isotropic spin fluctuation. This implies that low energy magnetic excitations are stringly affected by the stripe order.

Oral presentation

Magnetic structure of frustrated magnets studied by spherical neutron polarimetry

Matsuda, Masaaki; Takeda, Masayasu; Osawa, Akira*; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

Magnetic structure of frustrated magnets studied by 3D neutron polarimetry using CRYOPAD at JRR-3

Matsuda, Masaaki; Takeda, Masayasu; Osawa, Akira*; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

Magnetic structure of TbMnO$$_3$$ studied by spherical polarimetry

Kajimoto, Ryoichi; Matsuda, Masaaki; Takeda, Masayasu; Kakurai, Kazuhisa; Mitsui, Yukari*; Yoshizawa, Hideki*; Kimura, Tsuyoshi*; Tokura, Yoshinori*

no journal, , 

no abstracts in English

Oral presentation

Spin fluctuation and its anisotropy in La$$_{2-x}$$(Sr,Ba)$$_{x}$$CuO$$_{4}$$

Wakimoto, Shuichi; Fujita, Masaki*; Gu, G.*; Kakurai, Kazuhisa; Matsuda, Masaaki; Takeda, Masayasu; Tranquada, J. M.*; Yamada, Kazuyoshi*; Birgeneau, R. J.*; Frost, C. D.*

no journal, , 

To study effects of the stripe structure to the magnetic excitations in the high-$$T_c$$ cuprates, we have performed polarized neutron scattering study on La$$_{1.875}$$Ba$$_{0.125}$$CuO$$_{4}$$ and La$$_{1.92}$$Sr$$_{0.08}$$CuO$$_{4}$$. The former shows robust stripe order whereas the latter has only weak order of stripes. The former shows spin fluctuations which are confined in the CuO$$_2$$ plane, correspondingly to the confinement of the ordered spins in the plane. The latter shows nearly isotropic spin fluctuations. These observations imply that the low-energy spin excitations are strongly affected by the stripe order, which is important to understand the origin of the universal magnetic dispersion in the high-$$T_c$$ cuprates.

Oral presentation

3-D polarization analysis investigation on frustrated spin and multiferroic systems

Kakurai, Kazuhisa; Takeda, Masayasu; Matsuda, Masaaki; Wakimoto, Shuichi; Kajimoto, Ryoichi; Leli$`e$vre-Berna, E.*; Tasset, F.*; Nakamura, Mitsutaka; Osawa, Akira*

no journal, , 

Recent 3-dimensional polarization investigations using CRYOPAD at JRR-3, JAEA, will be reviewed. Results on CdCr$$_{2}$$O$$_{4}$$, a frustrated spin system with pyrochlor structure, and YMnO$$_{3}$$, a multiferroic system with spin chirality, are presented and the importance of this advanced polarization analysis method is discussed.

28 (Records 1-20 displayed on this page)