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Geprgs, S.*; Kehlberger, A.*; Coletta, F.*; Qiu, Z.*; Guo, E.-J.*; Schulz, T.*; Mix, C.*; Meyer, S.*; Kamra, A.*; Althammer, M.*; et al.
Nature Communications (Internet), 7, p.10452_1 - 10452_6, 2016/02
Times Cited Count:152 Percentile:97.33(Multidisciplinary Sciences)Lorusso, G.*; Nishimura, Shunji*; Xu, Z. Y.*; Jungclaus, A.*; Shimizu, Y.*; Simpson, G. S.*; Sderstrm, P.-A.*; Watanabe, H.*; Browne, F.*; Doornenbal, P.*; et al.
Physical Review Letters, 114(19), p.192501_1 - 192501_7, 2015/05
Times Cited Count:164 Percentile:97.96(Physics, Multidisciplinary)Althammer, M.*; Meyer, S.*; Nakayama, Hiroyasu*; Schreier, M.*; Altmannshofer, S.*; Weiler, M.*; Huebl, H.*; Geprgs, S.*; Opel, M.*; Gross, R.*; et al.
Physical Review B, 87(22), p.224401_1 - 224401_15, 2013/06
Times Cited Count:416 Percentile:99.41(Materials Science, Multidisciplinary)We experimentally investigate and quantitatively analyze the spin Hall magnetoresistance (SMR) effect in ferromagnetic insulator (FI)/Pt and FI/nonmagnetic metal/Pt hybrid structures. For the FI, we use either YIG, nickel ferrite, or magnetite and for the nonmagnet, Cu or Au. The SMR is theoretically ascribed to the combined action of spin Hall and inverse spin Hall effect in the Pt top layer. It therefore should characteristically depend upon the orientation of the magnetization in the adjacent ferromagnet and prevail even if an additional, nonmagnetic metal layer is inserted between Pt and the ferromagnet. Our experimental data corroborate these theoretical conjectures. Using the SMR theory to analyze our data, we extract the spin Hall angle and the spin diffusion length in Pt. For a spin-mixing conductance of m, we obtain a spin Hall angle of 0.11 0.08 and a spin diffusion length of (1.5 0.5) nm for Pt in our samples.
Li, H.-P.*; Yeager, C. M.*; Brinkmeyer, R.*; Zhang, S.*; Ho, Y.-F.*; Xu, C.*; Jones, W. L.*; Schwehr, K. A.*; Otosaka, Shigeyoshi; Roberts, K. A.*; et al.
Environmental Science & Technology, 46(9), p.4837 - 4844, 2012/03
Times Cited Count:52 Percentile:77.77(Engineering, Environmental)In order to develop an understanding of the role that microorganisms play in the transport of I in soil-water systems, naturally occurring bacteria isolated from the F-area subsurface of the Savannah River Site (SRS) were assessed for iodide oxidizing activity. Spent liquid medium from a number of SRS bacterial cultures enhanced iodide oxidation 2-10 fold in the presence of hydrogen peroxide (HO). From a time-series measurements of peroxidase activities and organic acid concentrations, it was hypothesized that microbial organic acid exudate promoted iodide oxidation via following mechanisms; (1) organic acids interact with HO to form strong iodide oxidizing agents, peroxy carboxylic acids, and (2) organic acid secretion led to enhanced rates of HO-dependent iodide oxidation by lowering the pH of the culture medium.
Xu, C.*; Miller, E. J.*; Zhang, S.*; Li, H.-P.*; Ho, Y.-F.*; Schwehr, K. A.*; Kaplan, D. I.*; Otosaka, Shigeyoshi; Roberts, K. A.*; Brinkmeyer, R.*; et al.
Environmental Science & Technology, 45(23), p.9975 - 9983, 2011/12
Times Cited Count:68 Percentile:83.22(Engineering, Environmental)In order to investigate accumulation process of iodine-129 (I) in a contaminated F-Area groundwater plume of the US Savannah River Site, soil resuspension experiments simulating surface runoff and erosion events were conducted. Results showed that 7277% of the newly-introduced iodide was irreversibly sequestered into the organic-rich soil, while the rest was transformed into colloidal and dissolved organo-iodine by the soil. Laboratory iodination of the soil indicated a preferential incorporation of inorganic iodine into soil organic matter (SOM) at acidic pH (34), except for the iodination catalyzed by lactoperoxidase, which favors more alkaline conditions. From this result, we concluded that under very acidic conditions, abiotic iodination of SOM was predominant, while under less acidic conditions (pH 5), microbial enzymatically-assisted iodination took over.
Xu, C.*; Zhang, S.*; Ho, Y.-F.*; Miller, E. J.*; Roberts, K. A.*; Li, H.-P.*; Schwehr, K. A.*; Otosaka, Shigeyoshi; Kaplan, D. I.*; Brinkmeyer, R.*; et al.
Geochimica et Cosmochimica Acta, 75(19), p.5716 - 5735, 2011/10
Times Cited Count:62 Percentile:83.32(Geochemistry & Geophysics)In order to understand the effect of soil organic matter (SOM) on the mobility of iodine in the vicinity of the F-area seepage basin at the U.S. Department Energy's Savannah River Site (SRS), relationships between radioiodine/iodine concentration and properties of SOM (e.g., degree of humification, aromaticity, and molecular weight) were examined. Analyses were carried out for four sequential extracts of SOM (freshwater, alkaline, glycerol, and citric-alkaline solutions). Iodine in SOM was selectively bound to a small-size aromatic subunit (less than 10 kDa), and majority of water soluble I was associated with a low molecular weight amphiphilic organic carrier (13.5-15 kDa). From these results, it was suggested that (1) SOM behaved as a sink as well as a source for iodine at the SRS, and (2) the function of SOM varies with groundwater chemistry.
Otosaka, Shigeyoshi; Schwehr, K. A.*; Kaplan, D. I.*; Roberts, K. A.*; Zhang, S.*; Xu, C.*; Li, H.-P.*; Ho, Y.-F.*; Brinkmeyer, R.*; Yeager, C. M.*; et al.
Science of the Total Environment, 409(19), p.3857 - 3865, 2011/09
Times Cited Count:64 Percentile:82.13(Environmental Sciences)Spatial distributions of concentrations and speciation of radioiodine (I) and stable iodine (I) in groundwater in the vicinity of the F-area seepage basin at the U.S. Department Energy of Savannah River Site were investigated. I concentration in groundwater was 8.6 Bq/L immediately downstream of the seepage basin (well FSB-95DR), and decreased with distance from the infiltration basin. I concentration decreased similarly to that of I. Although there was no potential I source in wastes in the basin, I also showed a similar gradient to that of I. High concentrations of I or I were not detected in groundwater collected from wells located outside of the mixed waste plume of this area. The high iodide concentrations in groundwater near the basin were presumed to be caused by dissolution of iodide from soil due to gradually increasing of pH values in the last decade.
Ostermeyer, M.*; Kong, H.-J.*; Kovalev, V. I.*; Harrison, R. G.*; Fotiadi, A. A.*; Mgret, P.*; Kalal, M.*; Slezak, O.*; Yoon, J. W.*; Shin, J. S.*; et al.
Laser and Particle Beams, 26(3), p.297 - 362, 2008/09
Times Cited Count:41 Percentile:55.6(Physics, Applied)Kamada, Yutaka; Leonard, A. W.*; Bateman, G.*; Becoulet, M.*; Chang, C. S.*; Eich, T.*; Evans, T. E.*; Groebner, R. J.*; Guzdar, P. N.*; Horton, L. D.*; et al.
Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 8 Pages, 2007/03
no abstracts in English
Konoshima, Shigeru; Leonard, A. W.*; Ishijima, Tatsuo*; Shimizu, Katsuhiro; Kamata, Isao*; Meyer, W. H.*; Sakurai, Shinji; Kubo, Hirotaka; Hosogane, Nobuyuki; Tamai, Hiroshi
Plasma Physics and Controlled Fusion, 43(7), p.959 - 983, 2001/07
Times Cited Count:30 Percentile:66.91(Physics, Fluids & Plasmas)no abstracts in English