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51. Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12.

Author

Kawamoto, Y., Kikkawa, T., Kawamata, M., Umemoto, Y., Manning, A. G., Rule, K. C., Ikeuchi, K., Kamazawa, K., Fujita, M., Saitoh, E., Kakurai, K., and Nambu, Y.

Subjects
NEUTRON scattering, INELASTIC neutron scattering, NEUTRON measurement, MAGNETIC moments, BAND gaps, DISPERSION (Chemistry)
Abstract

Magnon spin currents in the ferrimagnetic garnet Tb3Fe5O12 with 4f electrons were examined through the spin-Seebeck effect and neutron scattering measurements. The compound shows a magnetic compensation, where the spin-Seebeck signal reverses above and below T comp = 249.5 (4) K. Unpolarized neutron scattering unveils two major magnon branches with finite energy gaps, which are well explained in the framework of spin-wave theory. Their temperature dependencies and the direction of the precession motion of magnetic moments, i.e., magnon polarization, defined using polarized neutrons, explain the reversal at T comp and decay of the spin-Seebeck signals at low temperatures. We illustrate an example that momentum- and energy-resolved microscopic information is a prerequisite to understand the magnon spin current. [ABSTRACT FROM AUTHOR]

Published
2024
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56. Treatment of systemic hypertension is important for improvement of macular edema associated with retinal vein occlusion

Author

Kida T, Morishita S, Kakurai K, Suzuki H, Oku H, and Ikeda T

Subjects
Ophthalmology, RE1-994
Abstract

Teruyo Kida, Seita Morishita, Keigo Kakurai, Hiroyuki Suzuki, Hidehiro Oku, Tsunehiko IkedaDepartment of Ophthalmology, Osaka Medical College, Osaka, JapanBackground: We report our findings in three cases of unilateral macular edema associated with retinal vein occlusion (RVO) that improved after successful treatment of systemic hypertension alone.Methods: All three cases had systemic hypertension but no diabetes mellitus or other ocular diseases associated with macular edema. All patients were treated only with medication for systemic hypertension. Optical coherence tomography was performed to determine the foveal thickness before and after treatment.Results: Case one was a 72-year-old woman with a central RVO who had macular edema in her left eye and a visual acuity (VA) of 20/50. Her blood pressure (BP) was 169/96 mmHg. One month after the initiation of a calcium blocker to treat her systemic hypertension, her BP was decreased, macular edema was reduced, and her VA improved to 20/20. Case two was a 62-year-old woman with branch RVO. Her VA was 20/40 and her BP was 165/97 mmHg. Six weeks after initiation of medication to treat her systemic hypertension, her RVO-related macular edema had decreased and her VA improved to 20/20. Case three was a 71-year-old man with branch RVO. His VA was 20/50 and his BP was 165/87 mmHg. One month after initiation of treatment for systemic hypertension, his RVO-related macular edema had disappeared and his VA improved to 20/20. All three cases had nonischemic RVO by fluorescein angiography, and they did not develop ischemic changes for at least 1 year. Conclusion: The reduction of macular edema following a decrease in the systemic hypertension suggests that the edema was most likely caused by leakage of fluids from the blood vessels. We recommend that the blood pressure should be measured in all patients with macular edema before initiating intravitreal anti-VEGF therapy.Keywords: anti-VEGF therapy, early treatment, frequent injection, high cost

Published
2014

58. Spin and Charge Dynamics in the Hole-Doped Two-Leg Ladder Compound Sr14−x Ca x Cu24O41

Author

Akimitsu, J., Nagata, T., Fujino, H., Motoyama, N., Eisaki, H., Uchida, S., Takahashi, H., Nakanishi, T., Môri, N., Nishi, M., Kakurai, K., Katano, S., Hiroi, M., Sera, M., Kobayashi, N., Cardona, Manuel, editor, Fulde, Peter, editor, von Klitzing, Klaus, editor, Queisser, Hans-Joachim, editor, Merlin, Roberto, editor, Störmer, Horst, editor, Fukuyama, Hidetoshi, editor, and Nagaosa, Naoto, editor

Published
1999
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60. Characterization of glasses for 3He neutron spin filter cells

Author

Sakaguchi, Y., Kira, H., Oku, T., Shinohara, T., Suzuki, J., Sakai, K., Nakamura, M., Suzuya, K., Arai, M., Takeda, M., Wakimoto, S., Yamazaki, D., Koizumi, S., Endoh, Y., Kakurai, K., Arimoto, Y., Ino, T., Shimizu, H.M., Kamiyama, T., Ohoyama, K., Hiraka, H., Tsutsumi, K., Yamada, K., and Chang, L.J.

Published
2011
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63. Development and application of a 3He Neutron Spin Filter at J-PARC

Author

Okudaira, T., Oku, T., Ino, T., Hayashida, H., Kira, H., Sakai, K., Hiroi, K., Takahashi, S., Aizawa, K., Endo, H., Endo, S., Hino, M., Hirota, K., Honda, T., Ikeda, K., Kakurai, K., Kambara, W., Kitaguchi, M., Oda, T., Ohshita, H., Otomo, T., Shimizu, H.M., Shinohara, T., Suzuki, J., Yamamoto, T., Okudaira, T., Oku, T., Ino, T., Hayashida, H., Kira, H., Sakai, K., Hiroi, K., Takahashi, S., Aizawa, K., Endo, H., Endo, S., Hino, M., Hirota, K., Honda, T., Ikeda, K., Kakurai, K., Kambara, W., Kitaguchi, M., Oda, T., Ohshita, H., Otomo, T., Shimizu, H.M., Shinohara, T., Suzuki, J., and Yamamoto, T.

Abstract

We are developing a neutron polarizer with polarized He gas, referred to as a He spin filter, based on the Spin Exchange Optical Pumping (SEOP) for polarized neutron scattering experiments at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). A He gas-filling station was constructed at J-PARC, and several He cells with long spin relaxation times have been fabricated using the gas-filling station. A laboratory has been prepared in the MLF beam hall for polarizing He cells, and compact pumping systems with laser powers of 30 W and 110 W, which can be installed onto a neutron beamline, have been developed. A He polarization of 85% was achieved at a neutron beamline by using the pumping system with the 110 W laser. Recently, the first user experiment utilizing the He spin filter was conducted, and there have been several more since then. The development and utilization of He spin filters at MLF of J-PARC are reported.

Published
2020

73. Development and application of a 3He Neutron Spin Filter at J-PARC

Author

Okudaira, T., primary, Oku, T., additional, Ino, T., additional, Hayashida, H., additional, Kira, H., additional, Sakai, K., additional, Hiroi, K., additional, Takahashi, S., additional, Aizawa, K., additional, Endo, H., additional, Endo, S., additional, Hino, M., additional, Hirota, K., additional, Honda, T., additional, Ikeda, K., additional, Kakurai, K., additional, Kambara, W., additional, Kitaguchi, M., additional, Oda, T., additional, Ohshita, H., additional, Otomo, T., additional, Shimizu, H.M., additional, Shinohara, T., additional, Suzuki, J., additional, and Yamamoto, T., additional

Published
2020
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74. Observation of Magnon Polarization

Author

Nambu, Y., primary, Barker, J., additional, Okino, Y., additional, Kikkawa, T., additional, Shiomi, Y., additional, Enderle, M., additional, Weber, T., additional, Winn, B., additional, Graves-Brook, M., additional, Tranquada, J. M., additional, Ziman, T., additional, Fujita, M., additional, Bauer, G. E. W., additional, Saitoh, E., additional, and Kakurai, K., additional

Published
2020
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75. q=0 long-range magnetic order in centennialite CaCu3(OD)6Cl2·0.6D2O : A spin- 12 perfect kagome antiferromagnet with J1−J2−Jd

Author

Iida, K., primary, Yoshida, H. K., additional, Nakao, A., additional, Jeschke, H. O., additional, Iqbal, Y., additional, Nakajima, K., additional, Ohira-Kawamura, S., additional, Munakata, K., additional, Inamura, Y., additional, Murai, N., additional, Ishikado, M., additional, Kumai, R., additional, Okada, T., additional, Oda, M., additional, Kakurai, K., additional, and Matsuda, M., additional

Published
2020
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87. Magnetic field dependence of spin-glass freezing temperature in a diluted antiferromagnet Mn0.55Mg0.45TiO3

Author

Fukaya, A., Satooka, J., Ito, A., Nakajima, K., Kakurai, K., Nishiyama K., and Nagamine, K.

Subjects
Antiferromagnetism -- Research, Magnetic fields -- Research, Physics
Abstract

Research into the magnetic properties of a spin-glass Mn0.55Mg0.45TiO3 under magnetic fields is presented. It is suggested that microscopic behaviour of spins is not influenced by fields, at least in the field region applied in this work.

Published
2001

93. Homo-chiral crystal growth and mono-chiral helimagnetism in inorganic chiral magnetic compounds

Author

Kousaka, Yusuke, Ohishi, K., Ninomiya, H., Matsumoto, Y., Ohara, S., Kakurai, K., Hutanu, V., Suzuki, J., Campo, Javier, Inoue, Katsuya, Akimitsu, J., Ministerio de Economía y Competitividad (España), and Japan Society for the Promotion of Science

Abstract

Trabajo presentado al International Workshop on Multipole Physics and Related Phenomena (J-Physics), celebrado en Hachimantai, Iwate (Japón) del 24 al 28 de septiemb, This work was supported by JSPS KAKENHI Grant Number 25220803, 25390139, 26108719, 15H03680, 15H05885, 15H05886, 16KK0102, 17H02912, 17H02767, and 17H02815. JC acknowledges the Grant Number MAT2015-68200-C2-2-P from the Spanish Ministry of Economy and Competitiveness.

Published
2017

96. Development of an in Situ 3He NSF Using SEOP Technique with an Evaluation System for the Pulsed Neutron Source.

Author

Okudaira, T., Oku, T., Sakai, K., Ino, T., Hayashida, H., Hiroi, K., Shinohara, T., Kakurai, K., and Aizawa, K.

Abstract

A 3He spin filter is a useful device for polarizing a neutron beam. We are developing the 3He spin filters for users of the material and life science facility of the Japan Proton Accelerator Research Complex (J‑PARC). An in situ SEOP system with a 3He polarization evaluation system using nuclear magnetic resonance (NMR) method of adiabatic fast passage and electron paramagnetic resonance (EPR) was developed. We conducted an experiment on the neutron beam line BL10 (NOBORU) of J-PARC to confirm the consistency of 3He polarization, estimated using the neutron transmission, NMR and EPR. The polarization of 3He, evaluated using the different methods, was consistent and the evaluation system operated normally for about 6 h. [ABSTRACT FROM AUTHOR]

Published
2020
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