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Journal Articles

Quantitative evaluation of texture and dislocations during annealing after hot deformation in austenitic steel using neutron diffraction

Tomota, Yo*; Sato, Shigeo*; Uchida, M.*; Xu, P. G.; Harjo, S.; Gong, W.; Kawasaki, Takuro

Materials Science Forum, 905, p.25 - 30, 2017/08

Journal Articles

Temperature dependence of the spin Seebeck effect in [Fe$$_{3}$$O$$_{4}$$/Pt]n multilayers

Ramos, R.*; Kikkawa, Takashi*; Anad$'o$n, A.*; Lucas, I.*; Uchida, Kenichi*; Algarabel, P. A.*; Morell$'o$n, L.*; Aguirre, M. H.*; Saito, Eiji; Ibarra, M. R.*

AIP Advances (Internet), 7(5), p.055915_1 - 055915_7, 2017/05

 Times Cited Count:13 Percentile:25.64(Nanoscience & Nanotechnology)

Journal Articles

Ion induced modifications of Mn-doped ZnO films

Matsunami, Noriaki*; Ito, M.*; Kato, M.*; Okayasu, Satoru; Sataka, Masao*; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 365(Part A), p.191 - 195, 2015/12

 Times Cited Count:2 Percentile:73.33(Instruments & Instrumentation)

We have studied ion impact effects on atomic structure in terms of X-ray diffraction (XRD), optical absorption and electrical resistivity of Mn (6%)-doped ZnO films under 100 MeV Xe ion impact at room temperature. We find the monotonic reduction of the XRD intensity to 1/50 of that of unirradiated film at 5 $$times$$10$$^{14}$$ cm$$^{-2}$$, little bandgap change ($$<$$0.02 eV) and decrease of the resistivity by 4 order of magnitude. The resistivity modification has been compared with that by irradiations of low energy ions such as 100 keV Ne and N, which show more effective decrease of resistivity. We also find that temperature (T) dependence of the magnetic susceptibility ($$chi$$) of Mn-doped ZnO follows the Curie law: $$chi$$ = $$chi$$$$_{o}$$ + C/T (i.e., paramagnetic) and the Curie constant C decreases to a half of that before irradiation (C$$_{O}$$ = 0.012 emu cm$$^{-3}$$ K) at 100 MeV Xe ion fluence of 10$$^{12}$$ cm$$^{-2}$$.

Journal Articles

Unconventional scaling and significant enhancement of the spin Seebeck effect in multilayers

Ramos, R.*; Kikkawa, Takashi*; Aguirre, M.*; Lucas, I.*; Anad$'o$n, A.*; Oyake, Takafumi*; Uchida, Kenichi*; Adachi, Hiroto; Shiomi, Junichiro*; Algarabel, P. A.*; et al.

Physical Review B, 92(22), p.220407_1 - 220407_5, 2015/12

 Times Cited Count:45 Percentile:8.28(Materials Science, Multidisciplinary)

Journal Articles

Evaluation of thermal gradients in longitudinal spin Seebeck effect measurements

Sola, A.*; Kuepferling, M.*; Basso, V.*; Pasquale, M.*; Kikkawa, Takashi*; Uchida, Kenichi*; Saito, Eiji

Journal of Applied Physics, 117(17), p.17C510_1 - 17C510_4, 2015/05

 Times Cited Count:24 Percentile:18.92(Physics, Applied)

Journal Articles

Sign of inverse spin Hall voltages generated by ferromagnetic resonance and temperature gradients in yttrium iron garnet platinum bilayers

Schreier, M.*; Bauer, G. E. W.*; Vasyuchka, V.*; Flipse, J.*; Uchida, Kenichi*; Lotze, J.*; Lauer, V.*; Chumak, A.*; Serga, A.*; Daimon, Shunsuke*; et al.

Journal of Physics D; Applied Physics, 48(2), p.025001_1 - 025001_5, 2015/01

 Times Cited Count:43 Percentile:9.2(Physics, Applied)

Journal Articles

Anomalous Nernst effect of Fe$$_{3}$$O$$_{4}$$ single crystal

Ramos, R.*; Aguirre, M. H.*; Anad$'o$n, A.*; Blasco, J.*; Lucas, I.*; Uchida, Kenichi*; Algarabel, P. A.*; Morell$'o$n, L.*; Saito, Eiji; Ibarra, M. R.*

Physical Review B, 90(5), p.054422_1 - 054422_6, 2014/08

 Times Cited Count:45 Percentile:9.39(Materials Science, Multidisciplinary)

Journal Articles

Progress of the ITER NBI acceleration grid power supply reference design

Toigo, V.*; Zanotto, L.*; Bigi, M.*; Decamps, H.*; Ferro, A.*; Gaio, E.*; Guti$'e$rrez, D.*; Tsuchida, Kazuki; Watanabe, Kazuhiro

Fusion Engineering and Design, 88(6-8), p.956 - 959, 2013/10

 Times Cited Count:11 Percentile:25.06(Nuclear Science & Technology)

This paper reports the progress in the reference design of the Acceleration Grid Power Supply (AGPS) of the ITER Neutral Beam Injector (NBI). The design of the AGPS is very challenging, as it shall be rated to provide about 55 MW at 1 MV dc in quasi steady-state conditions; moreover, the procurement of the system is shared between the European Domestic Agency (F4E) and the Japanese Domestic Agency (JADA), resulting in additional design complication due to the need of a common definition of the interface parameters. A critical revision of the main design choices is presented also in light of the definition of some key interface parameters between the two AGPS subsystems. Moreover, the verification of the fulfillment of the requirements in any operational conditions taking into account the tolerance of the different parameters is also reported and discussed.

Journal Articles

Unidirectional spin-wave heat conveyer

An, Toshu*; Vasyuchka, V. I.*; Uchida, Kenichi*; Chumak, A. V.*; Yamaguchi, Kazuya*; Harii, Kazuya; Oe, Junichiro*; Jungfleisch, M. B.*; Kajiwara, Yosuke*; Adachi, Hiroto; et al.

Nature Materials, 12(6), p.549 - 553, 2013/06

 Times Cited Count:82 Percentile:4.1(Chemistry, Physical)

Journal Articles

Observation of the spin Seebeck effect in epitaxial Fe$$_{3}$$O$$_{4}$$ thin films

Ramos, R.*; Kikkawa, Takashi*; Uchida, Kenichi*; Adachi, Hiroto; Lucas, I.*; Aguirre, M.*; Algarabel, P.*; Morell$'o$n, L.*; Maekawa, Sadamichi; Saito, Eiji; et al.

Applied Physics Letters, 102(7), p.072413_1 - 072413_5, 2013/02

 Times Cited Count:119 Percentile:2.42(Physics, Applied)

Journal Articles

Heat-induced damping modification in yttrium iron garnet/platinum hetero-structures

Jungfleisch, M. B.*; An, Toshu*; Ando, Kazuya*; Kajiwara, Yosuke*; Uchida, Kenichi*; Vasyuchka, V. I.*; Chumak, A. V.*; Serga, A. A.*; Saito, Eiji; Hillebrands, B.*

Applied Physics Letters, 102(6), p.062417_1 - 062417_4, 2013/02

 Times Cited Count:41 Percentile:11.35(Physics, Applied)

Journal Articles

Thermally driven spin and charge currents in thin NiFe$$_{2}$$O$$_{4}$$/Pt films

Meier, D.*; Kuschel, T.*; Shen, L.*; Gupta, A.*; Kikkawa, Takashi*; Uchida, Kenichi*; Saito, Eiji; Schmalhorst, J.-M.*; Reiss, G.*

Physical Review B, 87(5), p.054421_1 - 054421_5, 2013/02

 Times Cited Count:88 Percentile:3.68(Materials Science, Multidisciplinary)

Journal Articles

A Possible overestimation of the effect of acetylation on lysin residues in KQ mutant analysis

Fujimoto, Hirofumi*; Higuchi, Mariko; Koike, Manabu*; Ode, Hirotaka*; Pinak, M.; Kotulic Bunta, J.*; Nemoto, Toshiyuki*; Sakudo, Takashi*; Honda, Naoko*; Maekawa, Hideaki*; et al.

Journal of Computational Chemistry, 33(3), p.239 - 246, 2012/01

 Times Cited Count:18 Percentile:43.65(Chemistry, Multidisciplinary)

Lysine acetylation is one of the most common protein post transcriptional modifications. The acetylation effects of lysine residues on Ku protein were examined herein applying several computer simulation techniques. Acetylation of the lysine residues did not reduce the affinity between Ku and its substrate, DNA, in spite of the fact that the substitution of lysine with glutamine (KQ mutant) reduced the affinity of Ku for DNA, or the substitution of lysine with arginine (KR mutant) did not reduce it, as previously reported in experimental studies. These results suggest that the effects of in vivo acetylation may be overestimated when the KQ mutant is employed in mimicry of the acetylated protein.

Journal Articles

Li(Zn,Mn)As as a new generation ferromagnet based on a I-II-V semiconductor

Deng, Z.*; Jin, C. Q.*; Liu, Q. Q.*; Wang, X. C.*; Zhu, J. L.*; Feng, S. M.*; Chen, L. C.*; Yu, R. C.*; Arguello, C.*; Goko, Tatsuo*; et al.

Nature Communications (Internet), 2, p.1425_1 - 1425_5, 2011/08

 Times Cited Count:118 Percentile:6.04(Multidisciplinary Sciences)

In a prototypical ferromagnet (Ga,Mn)As based on a III-V semiconductor, substitution of divalent Mn atoms into trivalent Ga sites leads to severely limited chemical solubility and metastable specimens available only as thin films. The doping of hole carriers via (Ga,Mn) substitution also prohibits electron doping. To overcome these difficulties, Masek et al. theoretically proposed systems based on a I-II-V semiconductor LiZnAs, where isovalent (Zn,Mn) substitution is decoupled from carrier doping with excess/deficient Li concentrations. Here we show successful synthesis of Li$$_{1+y}$$(Zn$$_{1-x}$$Mn$$_x$$)As in bulk materials. We reported that ferromagnetism with a critical temperature of up to 50 K is observed in nominally Li-excess compounds, which have p-type carriers.

Journal Articles

Event structure and double helicity asymmetry in jet production from polarized $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 84(1), p.012006_1 - 012006_18, 2011/07

 Times Cited Count:22 Percentile:28.57(Astronomy & Astrophysics)

We report on the event structure and double helicity asymmetry ($$A_{LL}$$) of jet production in longitudinally polarized $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV. Photons and charged particles were measured by the PHENIX experiment. Event structure was compared with the results from PYTHIA event generator. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order perturbative QCD calculation. We measured $$A_{LL}$$ = -0.0014 $$pm$$ 0.0037 at the lowest $$P_T$$ bin and -0.0181 $$pm$$ 0.0282 at the highest $$P_T$$ bin. The measured $$A_{LL}$$ is compared with the predictions that assume various $$Delta G(x)$$ distributions.

Journal Articles

Identified charged hadron production in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06

 Times Cited Count:136 Percentile:0.67(Physics, Nuclear)

Transverse momentum distributions and yields for $$pi^{pm}, K^{pm}, p$$, and $$bar{p}$$ in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different $$sqrt{s}$$ collisions. We also present the scaling properties such as $$m_T$$ and $$x_T$$ scaling and discuss the mechanism of the particle production in $$p + p$$ collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.

Journal Articles

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in $$p+p$$ and Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.

Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04

 Times Cited Count:7 Percentile:49.24(Physics, Nuclear)

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled $$p+p$$ collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to $$p+p$$ collisions.

Journal Articles

Measurement of neutral mesons in $$p$$ + $$p$$ collisions at $$sqrt{s}$$ = 200 GeV and scaling properties of hadron production

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03

 Times Cited Count:130 Percentile:1.61(Astronomy & Astrophysics)

The PHENIX experiment at RHIC has measured the invariant differential cross section for production of $$K^0_s$$, $$omega$$, $$eta'$$ and $$phi$$ mesons in $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters, $$n$$ and $$T$$, determining the high $$p_T$$ and characterizing the low $$p_T$$ regions for the spectra, respectively. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

Journal Articles

Charge-induced vortex lattice instability

Mounce, A. M.*; Oh, S.*; Mukhopadhyay, S.*; Halperin, W. P.*; Reyes, A. P.*; Kuhns, P. L.*; Fujita, Kazuhiro*; Ishikado, Motoyuki; Uchida, Shinichi*

Nature Physics, 7(2), p.125 - 128, 2011/02

 Times Cited Count:6 Percentile:52.15(Physics, Multidisciplinary)

It has been predicted that superconducting vortices should be electrically charged and that this effect is particularly enhanced for high-temperature superconductors. Hall effect and nuclear magnetic resonance (NMR) experiments suggest the existence of charge accumulation in the vortex core, but the effects are small and the interpretation controversial. Here we show that the Abrikosov vortex lattice, characteristic of the mixed state of superconductors, will become unstable at a sufficiently high magnetic field if there is charge trapped on the vortex core. Our NMR measurements of the magnetic fields generated by vortices in Bi$$_{2}$$Sr$$_{2}$$CaCu$$_{2}$$O$$_{8+y}$$ single crystals provide evidence for an electrostatically driven vortex lattice reconstruction with the magnitude of charge on each vortex pancake of $$sim2 times 10^{-3}e$$, depending on doping, in line with theoretical estimates.

Journal Articles

Spin-density wave near the vortex cores in the high-temperature superconductor Bi$$_{2}$$Sr$$_{2}$$CaCu$$_{2}$$O$$_{8+y}$$

Mounce, A. M.*; Oh, S.*; Mukhopadhyay, S.*; Halperin, W. P.*; Reyes, A. P.*; Kuhns, P. L.*; Fujita, Kazuhiro*; Ishikado, Motoyuki; Uchida, Shinichi*

Physical Review Letters, 106(5), p.057003_1 - 057003_4, 2011/02

 Times Cited Count:8 Percentile:44.75(Physics, Multidisciplinary)

Competition with magnetism is at the heart of high-temperature superconductivity, most intensely felt near a vortex core. To investigate vortex magnetism we have developed a spatially resolved probe based upon NMR spin-lattice-relaxation spectroscopy. With this approach we have found a spin-density wave associated with the vortex core in Bi$$_{2}$$Sr$$_{2}$$CaCu$$_{2}$$O$$_{8+y}$$, similar to checkerboard patterns in the local density of electronic states reported from scanning tunneling microscope experiments. We have determined both the spin-modulation amplitude and decay length from the vortex core in fields up to $$H$$ = 30 T.

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