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Journal Articles

Spin mixing conductance at a well-controlled platinum/yttrium iron garnet interface

Qiu, Z.*; Ando, Kazuya*; Uchida, Kenichi*; Kajiwara, Yosuke*; Takahashi, Ryo*; Nakayama, Hiroyasu*; An, Toshu*; Fujikawa, Yasunori*; Saito, Eiji

Applied Physics Letters, 103(9), p.092404_1 - 092404_4, 2013/08

 Times Cited Count:97 Percentile:95.88(Physics, Applied)

A platinum (Pt)/yttrium iron garnet (YIG) bilayer system with a well-controlled interface has been developed; spin mixing conductance at the Pt/YIG interface has been studied. A clear interface with good crystal perfection is experimentally demonstrated to be one of the important factors for an ultimate spin mixing conductance. The spin mixing conductance is obtained to be 1.3$$times$$10$$^{18}$$m$$^{-2}$$ at the well-controlled Pt/YIG interface, which is close to a theoretical prediction.

Journal Articles

Measurement and analysis of reflector reactivity worth by replacing stainless steel with zirconium at the fast critical assembly (FCA)

Fukushima, Masahiro; Kitamura, Yasunori; Ando, Masaki; Kugo, Teruhiko

Journal of Nuclear Science and Technology, 49(10), p.961 - 965, 2012/10

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

Journal Articles

Interface induced inverse spin Hall effect in bismuth/permalloy bilayer

Hou, D.*; Qiu, Z.*; Harii, Kazuya; Kajiwara, Yosuke*; Uchida, Kenichi*; Fujikawa, Yasunori*; Nakayama, Hiroyasu*; Yoshino, Tatsuro*; An, Toshu*; Ando, Kazuya*; et al.

Applied Physics Letters, 101(4), p.042403_1 - 042403_4, 2012/07

 Times Cited Count:60 Percentile:91.48(Physics, Applied)

Inverse spin Hall effect has been investigated in bismuth(Bi)/permalloy(Py) bilayer films by using the spin pumping at room temperature. From the ferromagnetic-resonance-spectrum linewidth data, Bi is proved to be a good spin sink in our structure. We measured inverse spin Hall voltage and conductance of the Bi/Py bilayer and found that the inverse spin Hall current, $$I_c$$, decreases with increasing the Bi thickness, which is in contrast to the former understanding in similar bilayer systems, e.g., Pt/Py. We constructed a model to explain the thickness dependence of $$I_c$$ quantitatively, in which spin transport modulation near Bi/Py interface is considered.

Journal Articles

Geometry dependence on inverse spin Hall effect induced by spin pumping in Ni$$_{81}$$Fe$$_{19}$$/Pt films

Nakayama, Hiroyasu*; Ando, Kazuya*; Harii, Kazuya; Yoshino, Tatsuro*; Takahashi, Ryo*; Kajiwara, Yosuke*; Uchida, Kenichi*; Fujikawa, Yasunori*; Saito, Eiji

Physical Review B, 85(14), p.144408_1 - 144408_7, 2012/04

 Times Cited Count:161 Percentile:97.96(Materials Science, Multidisciplinary)

Geometric effects on the inverse spin Hall effect (ISHE) induced by the spin pumping driven by the ferromagnetic resonance (FMR) have been investigated quantitatively. We measured the FMR spectra and the electromotive force induced by the ISHE with changing the size and the thickness in Ni$$_{81}$$Fe$$_{19}$$/Pt films. The intensity of generated charge currents due to the ISHE changes systematically with changing the film geometry. The experimental results show a clear difference between Ni$$_{81}$$Fe$$_{19}$$ and Pt thickness dependence of the ISHE induced by the spin pumping.

Journal Articles

Optical features of a LiF crystal soft X-ray imaging detector irradiated by free electron laser pulses

Pikuz, T.; Faenov, A.*; Fukuda, Yuji; Kando, Masaki; Bolton, P.; Mitorfanov, A.*; Vinogradov, A.*; Nagasono, Mitsuru*; Ohashi, Haruhiko*; Yabashi, Makina*; et al.

Optics Express (Internet), 20(4), p.3424 - 3433, 2012/02

 Times Cited Count:22 Percentile:75.12(Optics)

Journal Articles

All-oxide system for spin pumping

Qiu, Z.*; Kajiwara, Yosuke*; Ando, Kazuya*; Fujikawa, Yasunori*; Uchida, Kenichi*; Tashiro, Takaharu*; Harii, Kazuya*; Yoshino, Tatsuro*; Saito, Eiji

Applied Physics Letters, 100(2), p.022402_1 - 022402_3, 2012/01

 Times Cited Count:28 Percentile:76.85(Physics, Applied)

In a simple all-oxide system, spin pumping driven by spin wave resonances have been investigated by using the inverse spin-Hall effect (ISHE). In a lanthanum doped yttrium iron garnet (La:YIG)/indium tin oxide (ITO) bilayer film, the spin pumping generates and injects a spin current into the ITO layer, and an electromotive force signal is observed via the ISHE. The electromotive forces were measured depend on the out-of-plane magnetic-field-angle and the microwave excitation power, which were consistent with the theoretical prediction of the ISHE. The realization of the all-oxide spin pumping system extends possibilities for the oxide spintronics.

Journal Articles

Benchmark calculations of sodium-void experiments with uranium fuels at the fast critical assembly FCA

Fukushima, Masahiro; Kitamura, Yasunori; Kugo, Teruhiko; Yamane, Tsuyoshi; Ando, Masaki; Chiba, Go; Ishikawa, Makoto; Okajima, Shigeaki

Progress in Nuclear Science and Technology (Internet), 2, p.306 - 311, 2011/10

Journal Articles

Ablation of insulators under the action of short pulses of X-ray plasma lasers and free-electron lasers

Inogamov, N. A.*; Anisimov, S. I.*; Petrov, Y. V.*; Khokhlov, V. A.*; Zhakhovskii, V. V.*; Faenov, A. Ya.*; Pikuz, T.; Fortov, V. E.*; Skobelev, I. Y.*; Kato, Yoshiaki*; et al.

Journal of Optical Technology, 78(8), p.473 - 480, 2011/08

 Times Cited Count:5 Percentile:31.11(Optics)

Journal Articles

Two-temperature warm dense matter produced by ultrashort Extreme Vacuum Ultraviolet-Free Electron Laser (EUV-FEL) pulse

Inogamov, N. A.*; Faenov, A. Ya.*; Zhakhovsky, V. V.*; Pikuz, T. A.*; Skobelev, I. Yu.*; Petrov, Y. V.*; Khokhlov, V. A.*; Shepelev, V. V.*; Anisimov, S. I.*; Fortov, V. E.*; et al.

Contributions to Plasma Physics, 51(5), p.419 - 426, 2011/06

 Times Cited Count:19 Percentile:67.23(Physics, Fluids & Plasmas)

Warm dense matter, arising under the action of ultrashort EUV-FEL pulse onto LiF dielectric crystal, is characterized by high temperature of conduction electrons, with their number density achieving values of the order of atom number density at maximum laser fluences in our experiments. Expansion of matter, heated and pressurized through the electron-ion energy exchange, gives rise to the spallative ablation at small fluences and gaseous outflow from a target in the case of large fluences. Ablation threshold is low in comparison with a longer nanosecond XRL.

Journal Articles

Inverse spin-Hall effect induced by spin pumping in metallic systems

Ando, Kazuya*; Takahashi, Saburo; Ieda, Junichi; Kajiwara, Yosuke*; Nakayama, Hiroyasu*; Yoshino, Tatsuro*; Harii, Kazuya*; Fujikawa, Yasunori*; Matsuo, Mamoru*; Maekawa, Sadamichi; et al.

Journal of Applied Physics, 109(10), p.103913_1 - 103913_11, 2011/05

 Times Cited Count:338 Percentile:99.43(Physics, Applied)

The inverse spin-Hall effect (ISHE) induced by the spin pumping has been investigated systematically in simple ferromagnetic/paramagnetic bilayer systems. The spin pumping driven by ferromagnetic resonance injects a spin current into the paramagnetic layer, which gives rise to an electromotive force transverse to the spin current using the ISHE in the paramagnetic layer. In a Ni$$_{81}$$Fe$$_{19}$$/Pt film, we found an electromotive force perpendicular to the applied magnetic field at the ferromagnetic resonance condition. The spectral shape of the electromotive force is well reproduced using a simple Lorentz function, indicating that the electromotive force is due entirely to the ISHE induced by the spin pumping; the extrinsic magnetogalvanic effects are eliminated in this measurement. The electromotive force varies systematically by changing the microwave power, magnetic-field angle, and film size, which are well reproduced by a calculation based on the Landau-Lifshitz-Gilbert equation combined with the models of the ISHE and spin pumping. The electromotive force was observed also in a Pt/Y$$_3$$Fe$$_4$$GaO$$_{12}$$ film, in which the metallic Ni$$_{81}$$Fe$$_{19}$$ layer is replaced by an insulating Y$$_3$$Fe$$_4$$GaO$$_{12}$$ layer, supporting that the spin-pumping-induced ISHE is responsible for the observed electromotive force.

Journal Articles

Inverse spin-Hall effect induced by spin pumping in different size Ni$$_{81}$$Fe$$_{19}$$/Pt films

Nakayama, Hiroyasu*; Ando, Kazuya*; Harii, Kazuya*; Fujikawa, Yasunori*; Kajiwara, Yosuke*; Yoshino, Tatsuro*; Saito, Eiji

Journal of Physics; Conference Series, 266, p.012100_1 - 012100_4, 2011/01

 Times Cited Count:7 Percentile:96.03

The inverse spin-Hall effect, conversion of spin currents into electric voltage, has been investigated in Ni$$_{81}$$Fe$$_{19}$$/Pt bilayer films with different length and width. We measured the electric voltage generated by the inverse spin-Hall effect induced by the spin pumping at room temperature. The experimental results indicate that the electric voltage induced by the inverse spin-Hall effect is proportional to the length of Ni$$_{81}$$Fe$$_{19}$$/Pt bilayer films. In contrast, the electric voltage exhibits almost no variation by changing the width of the Ni$$_{81}$$Fe$$_{19}$$/Pt films. These results are consistent with the inverse spin-Hall effect model.

Journal Articles

Benchmark calculations of sodium-void experiments with uranium fuels at the fast critical assembly FCA

Fukushima, Masahiro; Kitamura, Yasunori; Kugo, Teruhiko; Yamane, Tsuyoshi; Ando, Masaki; Chiba, Go; Ishikawa, Makoto; Okajima, Shigeaki

Proceedings of Joint International Conference of 7th Supercomputing in Nuclear Application and 3rd Monte Carlo (SNA + MC 2010) (USB Flash Drive), 6 Pages, 2010/10

Journal Articles

Application of NBI technologies

Watanabe, Kazuhiro; Ando, Yasunori*

Purazuma, Kaku Yugo Gakkai-Shi, 81(10), p.792 - 797, 2005/10

no abstracts in English

Journal Articles

Impurity and particle recycling reduction by boronization in JT-60U

Higashijima, Satoru*; Sugie, Tatsuo; Kubo, Hirotaka; Tsuji, Shunji; Shimada, Michiya; Asakura, Nobuyuki; Hosogane, Nobuyuki; Kawano, Yasunori; Nakamura, Hiroo; Itami, Kiyoshi; et al.

Journal of Nuclear Materials, 220-222, p.375 - 379, 1995/00

 Times Cited Count:32 Percentile:93.37(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Achievement of high fusion triple product in the JT-60U high $$beta$$$$_{P}$$ H mode

Mori, Masahiro; Ishida, Shinichi; Ando, Toshiro; ; Asakura, Nobuyuki; Azumi, Masafumi; A.A.E.van-Blokland*; G.J.Frieling*; Fujii, Tsuneyuki; Fujita, Takaaki; et al.

Nuclear Fusion, 34(7), p.1045 - 1053, 1994/00

 Times Cited Count:30 Percentile:81.05(Physics, Fluids & Plasmas)

no abstracts in English

Oral presentation

Development of reactivity feedback effect measurement techniques under sub-critical condition in fast reactor, 1-5; FCA experimental plan

Fukushima, Masahiro; Okajima, Shigeaki; Kitamura, Yasunori; Ando, Masaki; Yamane, Tsuyoshi; Mori, Takamasa; Nishi, Hiroshi; Yamane, Yoshihiro*; Kanemoto, Shigeru*

no journal, , 

no abstracts in English

Oral presentation

Development of reactivity feedback effect measurement techniques under sub-critical condition in fast reactor, 1-1; Purpose and program

Okajima, Shigeaki; Nishi, Hiroshi; Yamane, Yoshihiro*; Kanemoto, Shigeru*; Yamane, Tsuyoshi; Mori, Takamasa; Kitamura, Yasunori; Fukushima, Masahiro; Kitano, Akihiro; Ando, Masaki; et al.

no journal, , 

The program was planned and has been carried out to develop of the reactivity feedback effect measurement techniques under sub-critical condition in the start-up experiment for fast reactors. The program includes the demonstration of the developed technique in fast critical assembly (FCA) and the proposal of the appropriate measurement system based on the results. The background and the purposes of the program and the outline of development subjects are presented.

Oral presentation

Development of reactivity feedback effect measurement techniques under sub-critical condition in fast reactor, 1-2; Development of acquisition system with high time-resolution for long time-series data

Kitamura, Yasunori; Yamane, Yoshihiro*; Okajima, Shigeaki; Fukushima, Masahiro; Ando, Masaki; Yamane, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

FCA critical experiment for validation of $$^{235}$$U capture cross section and experimental analysis

Kugo, Teruhiko; Kitamura, Yasunori; Fukushima, Masahiro; Ando, Masaki; Yamane, Tsuyoshi; Okajima, Shigeaki

no journal, , 

Sodium void reactivity experiments were performed at FCA using uranium fueled core to obtain integral data for evaluation of epithermal capture cross section of $$^{235}$$U. Experimental analysis were carried out with use of various nuclear data libraries including JENDL-4.0. The ratio of calculated value to experiment value (C/E) are less than unity with JENDL-3.3, ENDF/B-VII.0 and JEFF-3.1. This tendency of C/E values is similar to those for the sodium void reactivity experiments at BFS. Newly obtained integral data at FCA has a large sensitivity to $$^{235}$$U capture cross section from several hundreds eV to several keV. Thus, the new integral data are useful for validation of epithermal capture cross section of $$^{235}$$U and are used for the re-evaluation capture cross section of $$^{235}$$U in subgroup-29 of OECD/NEWA/NSC/WPEC.

Oral presentation

Utilization research and development of innovative fast reactor core with hydride neutron absorber, 3; Scope of the FCA experiments and the result of the 1st experiment

Ando, Masaki; Fukushima, Masahiro; Kitamura, Yasunori; Kugo, Teruhiko; Iwasaki, Tomohiko*; Konashi, Kenji*

no journal, , 

Experimental study to evaluate feasibility of hafnium hydride neutron absorber has been planned at FCA. This presentation reports the scpe of the plan and the results of the first experiment and analysis using plate-shaped simulating materials. The calculation accuracy of the standard fast reactor analysis method with the use of the JENDL-3.3 for the experimental results with boron carbide and hafnium hydride absorbers were compared. Underestimation of several % was observed for the calculation of the hafnium hydride in comparison with that of the boron carbide.

26 (Records 1-20 displayed on this page)