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論文

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:1 パーセンタイル:59.95(Environmental Sciences)

地下核実験検知のためには、医療用放射性同位元素製造施設から放出される放射性キセノンのCTBT観測所への影響を把握することが大変重要である。医療用放射性同位元素製造施設から放出される放射性キセノンのCTBT放射性核種観測所への影響に関する調査の一環として、オーストラリアの医療用放射性同位元素製造施設からの放射性キセノンの放出データに基づき、本施設から放出された放射性キセノンが南半球の6つのCTBT放射性核種観測所に与える影響のATM(大気輸送モデル)を用いた予測が10カ国からの参加者により行われた。

論文

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

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.

論文

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:41 パーセンタイル:6.37(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.

論文

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:33 パーセンタイル:10.42(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.

論文

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:97 パーセンタイル:2.46(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.

論文

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:18 パーセンタイル:17.94(Nuclear Science & Technology)

本報告は、欧州線量評価委員会が膝などの骨格に長期残留するアメリシウム計測法の向上を目的として実施したCONRADプロジェクト"膝ファントム中アメリシウム体外計測に関するモンテカルロモデリングの国際相互比較"の結果を述べたものである。本相互比較の結果、シミュレーションによりゲルマニウム検出器の波高分布を評価する場合、検出器のディメンジョン,材質,密度のみならず、ジオメトリや線源についても詳細な情報をもとにモデル化することが必要であることを確認した。

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