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Journal Articles

Effect of nano-size oxide particle dispersion and $$Delta$$-ferrite proportion on creep strength of 9Cr-ODS steel

Otsuka, Satoshi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai; Onuma, Masato*; Suzuki, Junichi

Materials Transactions, 50(7), p.1778 - 1784, 2009/06

 Times Cited Count:14 Percentile:57.89(Materials Science, Multidisciplinary)

Journal Articles

Magnetic circular dichroism of [Co/Pd] and [CoB/Pd] multilayered films

Agui, Akane; Asahi, Toru*; Sayama, Junichi*; Mizumaki, Masaichiro*; Tanaka, Masahito*; Osaka, Tetsuya*

Journal of Magnetism and Magnetic Materials, 320(22), p.3015 - 3018, 2008/11

 Times Cited Count:1 Percentile:5.70(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Existence and origin of compensation layer thickness in Tb$$_{20}$$Co$$_{80}$$/Pd multilayered films

Tanaka, Masahito*; Asahi, Toru*; Agui, Akane; Mizumaki, Masaichiro*; Sayama, Junichi*; Osaka, Tetsuya*

Journal of Physics D; Applied Physics, 41(5), p.055003_1 - 055003_4, 2008/03

 Times Cited Count:5 Percentile:22.12(Physics, Applied)

no abstracts in English

Journal Articles

Microscopic magnetic property of perpendicular magnetic films of Dy$$_{x}$$Co$$_{100-x}$$ measured using soft X-ray magnetic circular dichroism

Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Sayama, Junichi*; Osaka, Tetsuya*

Journal of Physics and Chemistry of Solids, 68(11), p.2148 - 2152, 2007/11

 Times Cited Count:9 Percentile:40.74(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Extended steady-state and high-beta regimes of net-current free heliotron plasmas in the Large Helical Device

Motojima, Osamu*; Yamada, Hiroshi*; Komori, Akio*; Oyabu, Nobuyoshi*; Muto, Takashi*; Kaneko, Osamu*; Kawahata, Kazuo*; Mito, Toshiyuki*; Ida, Katsumi*; Imagawa, Shinsaku*; et al.

Nuclear Fusion, 47(10), p.S668 - S676, 2007/10

 Times Cited Count:35 Percentile:73.23(Physics, Fluids & Plasmas)

The performance of net-current free heliotron plasmas has been developed by findings of innovative operational scenarios in conjunction with an upgrade of the heating power and the pumping/fuelling capability in the Large Helical Device (LHD). Consequently, the operational regime has been extended, in particular, with regard to high density, long pulse length and high beta. Diversified studies in LHD have elucidated the advantages of net-current free heliotron plasmas. In particular, an internal diffusion barrier (IDB) by a combination of efficient pumping of the local island divertor function and core fuelling by pellet injection has realized a super dense core as high as 5$$times$$10$$^{20}$$ m$$^{-3}$$, which stimulates an attractive super dense core reactor. Achievements of a volume averaged beta of 4.5% and a discharge duration of 54 min with a total input energy of 1.6 GJ (490 kW on average) are also highlighted. The progress of LHD experiments in these two years is overviewed by highlighting IDB, high-beta and long pulse.

Journal Articles

Extended steady-state and high-beta regimes of net-current free heliotron plasmas in the large helical device

Motojima, Osamu*; Yamada, Hiroshi*; Komori, Akio*; Oyabu, Nobuyoshi*; Kaneko, Osamu*; Kawahata, Kazuo*; Mito, Toshiyuki*; Muto, Takashi*; Ida, Katsumi*; Imagawa, Shinsaku*; et al.

Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 12 Pages, 2007/03

The performance of net-current free Heliotron plasmas has been developed by findings of innovative operational scenarios in conjunction with an upgrade of the heating power and the pumping/fueling capability in the Large Helical Device (LHD). Consequently, the operational regime has been extended, in particular, with regard to high density, long pulse length and high beta. Diversified studies in LHD have elucidated the advantages of net-current free heliotron plasmas. In particular, an Internal Diffusion Barrier (IDB) by combination of efficient pumping of the local island divertor function and core fueling by pellet injection has realized a super dense core as high as 5$$times$$10$$^{20}$$m$$^{-3}$$, which stimulates an attractive super dense core reactor. Achievements of a volume averaged beta of 4.5 % and a discharge duration of 54-min. with a total input energy of 1.6 GJ (490 kW in average) are also highlighted. The progress of LHD experiments in these two years is overviewed with highlighting IDB, high $$beta$$ and long pulse.

Journal Articles

Study on N$$_{2}$$-added and B-doped effect in Co/Pd multilayered films using soft X-ray absorption and magnetic circular dichroism

Agui, Akane; Asahi, Toru*; Sayama, Junichi*; Kawaji, Jun*; Mizumaki, Masaichiro*; Tanaka, Masahito*; Osaka, Tetsuya*

Journal of Physics D; Applied Physics, 39(14), p.2881 - 2885, 2006/07

 Times Cited Count:1 Percentile:4.30(Physics, Applied)

no abstracts in English

Journal Articles

Incident angle dependence of MCD at the Dy $$M$$$$_{5}$$-edge of perpendicular magnetic Dy$$_{x}$$Co$$_{100-x}$$ films

Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Sayama, Junichi*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Matsushita, Tomohiro*; Osaka, Tetsuya*; Miura, Yoshimasa*

Journal of Alloys and Compounds, 408-412, p.741 - 745, 2006/02

 Times Cited Count:7 Percentile:45.42(Chemistry, Physical)

no abstracts in English

Journal Articles

MCD measurement at the Tb $$M$$$$_{4,5}$$-edges of Tb$$_{17}$$Fe$$_{x}$$Co$$_{(83-x)}$$ perpendicular magnetization films

Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Sayama, Junichi*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Nakatani, Takeshi; Matsushita, Tomohiro*; Osaka, Tetsuya*; Miura, Yoshimasa*

Transactions of the Magnetics Society of Japan, 4(4-2), p.326 - 329, 2004/11

The electronic and spin state of the perpendicular magnetization film Tb$$_{17}$$Fe$$_{x}$$Co$$_{(83-x)}$$ was investigated by means of magnetic circular dichroism spectroscopy for each element. The samples are Tb$$_{17}$$Fe$$_{x}$$Co$$_{(83-x)}$$ while the ratio of a rare-earth metal Tb to transition metals Fe and Co is constant, the composition ratio of Fe and Co is changed. Changing the ratio, we estimated the expected orbital moments $$<$$$$L$$$$_{z}$$$$>$$ of Tb 4f electrons. The macroscopic magnetic property is studied from the microscopic point of view.

Journal Articles

Soft X-ray magnetic circular dichroism study of [Co/Pd] multilayered perpendicular magnetic films

Agui, Akane; Mizumaki, Masaichiro*; Matsushita, Tomohiro*; Asahi, Toru*; Kawaji, Jun*; Sayama, Junichi*; Osaka, Tetsuya*

Journal of Applied Physics, 95(12), p.7825 - 7831, 2004/06

 Times Cited Count:6 Percentile:27.38(Physics, Applied)

The electronic and spin states of [Co/Pd] multilayered perpendicular magnetization films with various seedlayers have been investigated by means of soft X-ray absorption and magnetic circular dichroism spectroscopy at the Co ${it L}$$$_{2,3}$$-edges. The expectation values of the orbital angular momentum $$<$$${it L}$$$_{z}$$$$>$$ and the spin angular momentum $$<$$${it S}$$$_{z}$$$$>$$ of Co atom in the [Co/Pd] multilayered film were estimated using the sum rule. It was found that the seedlayer changes macroscopic magnetic properties of the [Co/Pd] multilayered film without affecting the electronic and spin states of the upper layers of Co.

Oral presentation

Magnetic field dependence of MCD of perpendicular magnetic film Dy$$_{x}$$Co$$_{100-x}$$

Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Kagomiya, Isao*; Matsumoto, Koji*; Sayama, Junichi*; Morikawa, Tsuyoshi*; Osaka, Tetsuya*

no journal, , 

no abstracts in English

Oral presentation

Element selective magnetic hysteresis of Dy$$_{x}$$Co$$_{100-x}$$ by means of magnetic circular dichroism

Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Sayama, Junichi*; Kagomiya, Isao*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Osaka, Tetsuya*

no journal, , 

no abstracts in English

Oral presentation

Element selective hysteresis in perpendicular magnetic film Sm(Co,Cu)$$_{5}$$

Mizumaki, Masaichiro*; Agui, Akane; Sayama, Junichi*; Tanaka, Masahito*; Asahi, Toru*; Osaka, Tetsuya*

no journal, , 

no abstracts in English

Oral presentation

Thikness dependence of magnetic circular dichroism of TbCo/Pd multi layer films

Tanaka, Masahito*; Asahi, Toru*; Sayama, Junichi*; Agui, Akane; Mizumaki, Masaichiro*; Osaka, Tetsuya*

no journal, , 

no abstracts in English

Oral presentation

Macroscopic and element selective magnetic properties of TbCo/Pd multilayered and single layered film

Tanaka, Masahito*; Asahi, Toru*; Agui, Akane; Mizumaki, Masaichiro*; Sayama, Junichi*; Osaka, Tetsuya*

no journal, , 

We examined the macroscopic and element selective magnetic properties by Kerr hysteresis loop and X-ray magnetic circular dichroism (MCD) spectroscopy, respectively, of [Tb$$_{20}$$Co$$_{80}$$]$$_{20}$$/Pd multilayered films and Tb$$_{20}$$Co$$_{80}$$ single layered films with several TbCo layer thicknesses. We found that the macroscopic magnetic properties of TbCo/Pd and TbCo films were dependent on the TbCo layer thickness by Kerr effect measurement. We estimated the $$<$$Lz$$>$$, $$<$$Sz$$>$$ and $$<$$Lz$$>$$/$$<$$Sz$$>$$ values from MCD measurements at Co L2,3 edges. The values of $$<$$Lz$$>$$ and $$<$$Sz$$>$$ of both types of films were the almost same each other, while the clear distinction of Kerr effects was observed.

Oral presentation

Tb M5 and Co L3 magnetic circular dichroism hysteresis of Tb-Co perpendicular magnetization films

Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Tanaka, Masahito*; Sayama, Junichi*; Osaka, Tetsuya*

no journal, , 

no abstracts in English

Oral presentation

Element selective magnetization process in the perpendicular magnetization film of Sm(Co,Cu)$$_{5}$$

Mizumaki, Masaichiro*; Agui, Akane; Tanaka, Masahito*; Sayama, Junichi*; Asahi, Toru*; Osaka, Tetsuya*

no journal, , 

no abstracts in English

Oral presentation

Quantitative correlation between nano/micro-scale strucuture and high-temperature strength of 9Cr-ODS steel, 2; Relationship between high-temperature strength and nano/micro-scale strucuture

Otsuka, Satoshi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai; Suzuki, Junichi; Onuma, Masato*

no journal, , 

With a view to making clear the correlation between microstructure and high-temperature strength of 9Cr-ODS ferritic/martensitic duplex steel, the correlation between matrix ferrite proportion and high-temperature strength was quantitatively evaluated. The evaluated results were compared to the nano-structure data such as oxide particle diameter and number density evaluated in the companion report. Both the decreasing excess oxygen and the increasing titanium provides for enhancement of ferrite proportion, which is accompanied by the increasing number density of nano-scale oxide particles, thus appreciably improving high-temperature creep strength. This result is consistent with the previous TEM observation results showing that nano-scale oxide particles are more densely dispersed in ferrite than in tempered-martensite. The increase of ferrite proportion is shown to certainly improve high-temperature creep strength even though the number density of nano-scale oxide particles is kept constant.

Oral presentation

Quantitative correlation between nano/micro-scale structure and high-temperature strength of 9Cr-ODS steel, 1; Nano/micro-scale structure quantitative analysis using X-ray and neutron small angle scattering technique

Onuma, Masato*; Suzuki, Junichi; Otsuka, Satoshi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai

no journal, , 

This study discussed the interrelation between chemical composition and nano-scale oxide particle dispersion of the 9Cr-ODS steel for fast reactor fuel cladding application using small angle scattering (SAS) analysis, which is viewed as a strong tool for quantitative evaluation of nano-structure such as particle diameter and number density. Decreasing excess oxygen as well as increasing titanium is shown to provide the considerable increase of nano-scale particle population as well as the reduction of particle diameter. The type of these particles are identified to be Y$$_{2}$$Ti$$_{2}$$O$$_{7}$$ and the number density is evaluated to be in the range between 1E17 and 1E19 (cm$$^{-3}$$). The elevation of hot-extrusion temperature from 1150 $$^{circ}$$C to 1200 $$^{circ}$$C reduced 20% of nano-scale oxide particle number density.

Oral presentation

Nano-structure characterization of ferritic steels for FBR application using quantum beam analysis, 2; Evaluation of correlation between oxide particle dispersion and material strength in 9Cr-ODS steels for fuel cladding material using JRR-3 SANS-J-II

Otsuka, Satoshi; Suzuki, Junichi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai; Onuma, Masato*

no journal, , 

The effect of chemical composition on high-temperature creep strength of 9Cr-ODS steel and its relation to nano/micro scale microstructure were discussed. It was definitely demonstrated that high-temperature creep strength of 9Cr-ODS steel can be effectively improved by the increasing nano-scale oxide particle population-i.e. increasing oxide particle dispersion strengthening-as well as the formation of appropriate amount of ferrite phase in tempered martensite matrix.

24 (Records 1-20 displayed on this page)