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Journal Articles

$$Q$$-dependent collective relaxation dynamics of glass-forming liquid Ca$$_{0.4}$$K$$_{0.6}$$(NO$$_{3}$$)$$_{1.4}$$ investigated by wide-angle neutron spin-echo

Luo, P.*; Zhai, Y.*; Falus, P.*; Garc$'i$a Sakai, V.*; Hartl, M.*; Kofu, Maiko; Nakajima, Kenji; Faraone, A.*; Z, Y.*

Nature Communications (Internet), 13, p.2092_1 - 2092_9, 2022/04

Journal Articles

Improved performance of wide bandwidth neutron-spin polarizer due to ferromagnetic interlayer exchange coupling

Maruyama, Ryuji; Yamazaki, Dai; Aoki, Hiroyuki; Akutsu, Kazuhiro*; Hanashima, Takayasu*; Miyata, Noboru*; Soyama, Kazuhiko; Bigault, T.*; Saerbeck, T.*; Courtois, P.*

Journal of Applied Physics, 130(8), p.083904_1 - 083904_10, 2021/08

 Times Cited Count:1 Percentile:0(Physics, Applied)

Journal Articles

Nanoscale relaxation in "Water-in-Salt" and "Water-in-Bisalt" electrolytes

Gonzal$'e$z, M. A.*; Borodin, O.*; Kofu, Maiko; Shibata, Kaoru; Yamada, Takeshi*; Yamamuro, Osamu*; Xu, K.*; Price, D. L.*; Saboungi, M.-L.*

Journal of Physical Chemistry Letters (Internet), 11(17), p.7279 - 7284, 2020/09

 Times Cited Count:10 Percentile:78.29(Chemistry, Physical)

Journal Articles

Coherent magnetization rotation of a layered system observed by polarized neutron scattering under grazing incidence geometry

Maruyama, Ryuji; Bigault, T.*; Saerbeck, T.*; Honecker, D.*; Soyama, Kazuhiko; Courtois, P.*

Crystals (Internet), 9(8), p.383_1 - 383_13, 2019/08

 Times Cited Count:4 Percentile:51.9(Crystallography)

The in-plane magnetic structure of a layered system composed of polycrystalline grains smaller than the ferromagnetic exchange length was studied to elucidate the mechanism controlling the magnetic properties considerably different from the bulk using polarized neutron scattering under grazing incidence geometry. The measured result, together with quantitative analysis based on the distorted wave Born approximation, showed that the in-plane length of the area with uniform orientation of moments ranging from 0.5 to 1.1 $$mu$$m is not significantly varied during the process of demagnetization followed by remagnetization. The obtained behavior of moments is in good agreement with the two-dimensional random anisotropy model where coherent magnetization rotation is dominant.

Journal Articles

Accessible length scale of the in-plane structure in polarized neutron off-specular and grazing-incidence small-angle scattering measurements

Maruyama, Ryuji; Bigault, T.*; Wildes, A. R.*; Dewhurst, C. D.*; Saerbeck, T.*; Honecker, D.*; Yamazaki, Dai; Soyama, Kazuhiko; Courtois, P.*

Journal of Physics; Conference Series, 862(1), p.012017_1 - 012017_6, 2017/06

 Times Cited Count:6 Percentile:93.05

The in-plane magnetic structure of Fe/Si multilayers with a polycrystalline grain size less than the ferromagnetic exchange length was investigated using polarized neutron off-specular scattering and grazing-incidence small-angle scattering measurements. These complementary measurements, each of them covering different length scales, together with the data analysis based on the distorted wave Born approximation, revealed lateral correlation in the fluctuating orientation of the magnetization in the layer on a sub-$$mu$$m length scale. The obtained in-plane magnetic structure is consistent with the random anisotropy model, i.e. competition between the exchange interactions between neighboring spins and the local magnetocrystalline anisotropy.

JAEA Reports

Reports on JAEA's Reimei Research Program; April 1, 2011 - March 31, 2012

Nagame, Yuichiro

JAEA-Review 2012-036, 27 Pages, 2012/10

JAEA-Review-2012-036.pdf:2.11MB

The summaries of the 5 research projects conducted through the Reimei Research Program are published for the growth and development of the new researches.

JAEA Reports

Reports on JAEA's Reimei Research Program; April 1, 2010 - March 31, 2011

Nagame, Yuichiro

JAEA-Review 2011-031, 27 Pages, 2011/08

JAEA-Review-2011-031.pdf:2.39MB

This is a report of research results achieved through the five research projects, which were implemented as the Reimei Research Program of FY2010. The report is presented with the aim of development of atomic energy science research.

Journal Articles

Magnetization dynamics in the normal and superconducting phases of UPd$$_2$$Al$$_3$$, 1; Surveys in reciprocal space using neutron inelastic scattering

Hiess, A.*; Bernhoeft, N.*; Metoki, Naoto; Lander, G.*; Roessli, B.*; Sato, Noriaki*; Aso, Naofumi*; Haga, Yoshinori; Koike, Yoshihiro*; Komatsubara, Takemi*; et al.

Journal of Physics; Condensed Matter, 18(27), p.R437 - R451, 2006/07

 Times Cited Count:31 Percentile:33.24(Physics, Condensed Matter)

This topical review presents results from neutron inelastic scattering experiments on single crystals of UPd$$_2$$Al$$_3$$. We present a detailed and complete characterization of the wave vector- and energy-dependent magnetization dynamics in UPd$$_2$$Al$$_3$$ as measured by neutron inelastic scattering primarily in the form of extensive surveys in energy-momentum space under a wide range of experimental conditions, and put our observations in context with data that has been published previously by two independent groups. This study yields unique insight into the low-temperature ground state, which exhibits a microscopic coexistence of antiferromagnetism and superconductivity, makingUPd$$_2$$Al$$_3$$ one of the most accessible heavy-fermion superconductors that can be fully characterized by neutron spectroscopy.

Oral presentation

Renewed polarized neutron options on the triple-axis spectrometer TAS-1 at JAEA

Takeda, Masayasu; Nakamura, Mitsutaka; Kakurai, Kazuhisa; Leli$`e$vre-Berna, E.*; Tasset, F.*; Regnault, L.-P.*

no journal, , 

no abstracts in English

Oral presentation

PONTA-TASSE option at JRR-3M

Kakurai, Kazuhisa; Nishi, Masakazu*; Nakajima, Kenji; Zeyen, C.*

no journal, , 

To improve the energy resolution of a thermal neutron triple axis spectrometer to relative values of 10$$^{-4}$$Ei or better, the Triple Axis Spin Echo (TASSE) option was developed at JRR-3M, the research reactor of JAEA in Tokai. We report the design and construction of the static-field spin-echo option with the "optimal field shape" (OFS) coils. Some quasi-elastic experimental results on dynamical Huang scattering in order-disorder phase transition and frozen spin state in a frustrated multiferroic material will be presented.

Oral presentation

Advances in polarized neutron scattering experiments on TAS-1 at JRR-3

Takeda, Masayasu; Nakamura, Mitsutaka; Shimojo, Yutaka; Kakurai, Kazuhisa; Leli$`e$vre-Berna, E.*; Tasset, F.*; Regnault, L. P.*

no journal, , 

The status of the polarized neutron options on TAS-1 is reported. TAS-1 is a thermal neutron triple-axis spectrometer installed at JRR-3 of JAEA and has been operational since 1991. Following the recent advances in the polarization analysis technique an upgrading program of polarized neutron options for TAS-1 was started five years ago. In this program new doubly-focusing-polarizing Heusler monochromator and analyzer were introduced to TAS-1. In addition, one of three third-generation CRYOPAD(CRYOgenic Polarization Analysis Device)s which were assembled for ILL(D3), CEA-Grenoble(IN22) and JAEA was installed on TAS-1 to enable the spherical polarization analysis. Using the increased polarized neutron flux elastic and inelastic polarized neutron scattering experiments with the conventional setup for the one-dimensional polarization analysis and with CRYOPAD for the three-dimensional polarization analysis are now routinely performed on TAS-1.

Oral presentation

3-D polarization analysis investigation on frustrated spin and multiferroic systems

Kakurai, Kazuhisa; Takeda, Masayasu; Matsuda, Masaaki; Wakimoto, Shuichi; Kajimoto, Ryoichi; Leli$`e$vre-Berna, E.*; Tasset, F.*; Nakamura, Mitsutaka; Osawa, Akira*

no journal, , 

Recent 3-dimensional polarization investigations using CRYOPAD at JRR-3, JAEA, will be reviewed. Results on CdCr$$_{2}$$O$$_{4}$$, a frustrated spin system with pyrochlor structure, and YMnO$$_{3}$$, a multiferroic system with spin chirality, are presented and the importance of this advanced polarization analysis method is discussed.

Oral presentation

Study of the in-plane magnetic structure of neutron polarizing multilayer mirrors

Maruyama, Ryuji; Bigault, T.*; Wildes, A. R.*; Dewhurst, C. D.*; Saerbeck, T.*; Honecker, D.*; Yamazaki, Dai; Soyama, Kazuhiko; Courtois, P.*

no journal, , 

Neutron polarizing supermirror needs to display high polarization efficiency at low external fields to meet a variety of research demands. The magnetic properties of these multilayers with a polycrystalline grain size less than the ferromagnetic exchange length can be explained by the random anisotropy model, i.e. competition between the exchange interaction between neighboring spins and the local magnetocrystalline anisotropy. Off-specular scattering and grazing-incidence small-angle scattering measurements with polarized neutrons, each of them covering different length scales, together with the data analysis based on the distorted wave Born approximation, revealed lateral correlation in the fluctuating orientation of the magnetization in the layer on a sub-$$mu$$m length scale. The obtained in-plane magnetic structure was consistent with the random anisotropy model.

Oral presentation

Wide bandwidth neutron polarizing supermirror due to ferromagnetic interlayer exchange coupling

Maruyama, Ryuji; Yamazaki, Dai; Aoki, Hiroyuki; Akutsu, Kazuhiro*; Hanashima, Takayasu*; Miyata, Noboru*; Soyama, Kazuhiko; Bigault, T.*; Saerbeck, T.*; Courtois, P.*

no journal, , 

15 (Records 1-15 displayed on this page)
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