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International challenge to model the long-range transport of radioxenon released from medical isotope production to six Comprehensive Nuclear-Test-Ban Treaty monitoring stations

Maurer, C.*; Bar$'e$, J.*; Kusmierczyk-Michulec, J.*; Crawford, A.*; Eslinger, P. W.*; Seibert, P.*; Orr, B.*; Philipp, A.*; Ross, O.*; Generoso, S.*; et al.

Journal of Environmental Radioactivity, 192, p.667 - 686, 2018/12

 被引用回数:3 パーセンタイル:66.11(Environmental Sciences)



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

Ramos, R.*; 吉川 貴史*; Anad$'o$n, A.*; Lucas, I.*; 内田 健一*; Algarabel, P. A.*; Morell$'o$n, L.*; Aguirre, M. H.*; 齊藤 英治; Ibarra, M. R.*

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

 被引用回数:13 パーセンタイル:24.22(Nanoscience & Nanotechnology)

We report temperature dependent measurements of the spin Seebeck effect (SSE) in multilayers formed by repeated growth of a Fe$$_3$$O$$_4$$/Pt bilayer junction. The magnitude of the observed enhancement of the SSE, relative to the SSE in the single bilayer, shows a monotonic increase with decreasing the temperature. This result can be understood by an increase of the characteristic length for spin current transport in the system, in qualitative agreement with the recently observed increase in the magnon diffusion length in Fe$$_3$$O$$_4$$ at lower temperatures. Our result suggests that the thermoelectric performance of the SSE in multilayer structures can be further improved by careful choice of materials with suitable spin transport properties.


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

Ramos, R.*; 吉川 貴史*; Aguirre, M.*; Lucas, I.*; Anad$'o$n, A.*; 小宅 教文*; 内田 健一*; 安立 裕人; 塩見 淳一郎*; Algarabel, P. A.*; et al.

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

 被引用回数:47 パーセンタイル:8.47(Materials Science, Multidisciplinary)

Spin Seebeck effects have been investigated in highly crystalline magnetic multilayer films. Voltage as well as power generated by the spin Seebeck effect were found to be significantly enhanced with increasing the number of layers, $$n$$. This voltage enhancement defies the simple understanding of the spin Seebeck effect and suggests that spin current flowing between the magnetic layers in the thickness direction plays an important role in the multilayer SSE systems and the observed voltage enhancement.


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

Ramos, R.*; Aguirre, M. H.*; Anad$'o$n, A.*; Blasco, J.*; Lucas, I.*; 内田 健一*; Algarabel, P. A.*; Morell$'o$n, L.*; 齊藤 英治; Ibarra, M. R.*

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

 被引用回数:46 パーセンタイル:9.27(Materials Science, Multidisciplinary)

We report a complete characterization of the anomalous Nernst effect (ANE) and its relationship with the anomalous Hall effect (AHE) in Fe$$_{3}$$O$$_{4}$$. By combining full thermoelectric and electric transport measurements as a function of temperature, we have verified that the universal scaling relation between the anomalous Hall and diagonal conductivities, observed in materials with bad-metal-hopping type of conduction, is also applicable to the thermoelectric transport. We further show that the ANE and AHE are commonly related through the Mott relation, therefore demonstrating its validity for anomalous transport phenomena in materials with conduction in the dirty regime.


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

Ramos, R.*; 吉川 貴史*; 内田 健一*; 安立 裕人; Lucas, I.*; Aguirre, M.*; Algarabel, P.*; Morell$'o$n, L.*; 前川 禎通; 齊藤 英治; et al.

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

 被引用回数:120 パーセンタイル:2.44(Physics, Applied)

We report the experimental observation of the spin Seebeck effect in magnetite thin films. The signal observed at temperatures above the Verwey transition is a contribution from both the anomalous Nernst (ANE) and spin Seebeck (SSE) effects. The contribution from the ANE of the Fe$$_{3}$$O$$_{4}$$ layer to the SSE is found to be negligible due to the resistivity difference between Fe$$_{3}$$O$$_{4}$$ and Pt layers. Below the Verwey transition, the SSE is free from the ANE of the ferromagnetic layer and it is also found to dominate over the ANE due to magnetic proximity effect on the Pt layer.


Monte Carlo modelling of Germanium detectors for the measurement of low energy photons in internal dosimetry; Results of an international comparison

G$'o$mez-Ros, J.-M.*; de Carlan, L.*; Franck, D.*; Gualdrini, G.*; Lis, M.*; L$'o$pez, M. A.*; Moraleda, M.*; Zankl, M.*; Badal, A.*; Capello, K.*; et al.

Radiation Measurements, 43(2-6), p.510 - 515, 2008/02

 被引用回数:21 パーセンタイル:17.15(Nuclear Science & Technology)



Design and implementation of an evolutional data collecting system for the atomic and molecular databases

佐々木 明; 城 和貴*; 柏木 裕恵*; 渡辺 知恵美*; 鈴木 学*; Lucas, P.*; 大石 雅寿*; 加藤 太治*; 加藤 雅敏*; 加藤 隆子*

Journal of Plasma and Fusion Research SERIES, Vol.7, p.348 - 351, 2006/00

原子分子データベースは基礎科学,産業応用で利用されているが、広い分野からの需要を満たすには、現在手作業に頼っているデータ収集,評価を効率化することが不可欠である。われわれは、従来の原子データベースの構築の方法を分析し、原子分子データが記載されている論文の収集,論文中の重要データの抽出,具体的な図表のデータの読み取り,数値化の3つの段階に分け、コンピュータの活用による作業の効率化の方法の検討を行った。まず、論文の収集に関しては、多くの学術雑誌がオンライン化されていることを利用し、アブストラクトを自動的に収集することができる。次に、核融合研などにこれまでに蓄積されている、原子分子データが記載されている論文との類似性を計算することで、収集された論文の中から原子分子データが記載されている論文を選びだすことができると考えられる。本研究では、参照アブストラクトとの類似性のためにLVQ(Learning Vector Quantization)法によるテキスト分類の方法を用い、用意されたサンプルが原子分子データを含む論文かどうかの適合性を判定する実験を行い、結果の評価を行う。本研究は、会津大,奈良女子大,核融合研のグループが論文ダウンロードソフトの開発,テキスト分類ソフトの開発評価,参照用データの提供等の各要素を分担して行う。

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