Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
-MnAraki, Shingo*; Iwamoto, Kaisei*; Akiba, Kazuto*; Kobayashi, Tatsuo*; Munakata, Koji*; Kaneko, Koji; Osakabe, Toyotaka
Physical Review B, 110(9), p.094420_1 - 094420_7, 2024/09
Times Cited Count：0The -Mn phase exhibits a large anomalous Hall effect (AHE) in its pressure-induced weak ferromagnetic (WFM) state, despite its relatively small spontaneous magnetization of 0.02 
/Mn. To understand the underlying mechanism behind this AHE, we performed single crystal neutron diffraction measurements at 2.0 GPa to determine the magnetic structure of the WFM phase. Our investigation reveals a ferrimagnetic structure characterized by nearly collinear magnetic moments aligned along the [001] direction at sites I, II, III-1, and IV-1. In contrast, the small moments at sites III-2 and IV-2 lie within the (001) plane. The calculated net magnetization of this magnetic structure, (-0.020
0.005)/Mn atom, is in excellent agreement with the experimentally determined spontaneous magnetization. The observation of a magnetic reflection at 
= (0, 0, 0) satisfies a key condition for the emergence of the AHE.
Otsuka, Teppei*; Tanabe, Tetsuo*; Tokunaga, Kazutoshi*; Yoshida, Naoaki*; Ezato, Koichiro; Suzuki, Satoshi; Akiba, Masato
Journal of Nuclear Materials, 417(1-3), p.1135 - 1138, 2011/10
Times Cited Count：2 Percentile：17.84(Materials Science, Multidisciplinary)Suzuki, Satoshi; Ueda, Yoshio*; Tokunaga, Kazutoshi*; Sato, Kazuyoshi; Akiba, Masato
Fusion Science and Technology, 44(1), p.41 - 48, 2003/07
Times Cited Count：30 Percentile：85.79(Nuclear Science & Technology)no abstracts in English
Tokunaga, Kazutoshi*; Ezato, Koichiro; Suzuki, Satoshi; Akiba, Masato; Fujiwara, Tadashi*; Yoshida, Naoaki*
no journal, ,
Polycrystalline tungsten samples have been irradiated by 19 keV pulsed hydrogen and helium beam up to 1
10
/m
. Optical reflectivity has been measured with an ultraviolet-visible and near-infrared spectrophotometer, and a Fourier transform-infrared (FT-IR) spectrometer for the wave length between 190 - 2400 nm, 1.4 - 20 
m, respectively. In addition, optical constants have been calculated by results measured using a spectroscopic ellipsometer. Surface morphology has been also examined with a scanning electron microscope. Loss of metallic gloss and remarkable reduction of reflectivity (190-2400 nm) occurs by the hydrogen and helium irradiation of 
1022 He
/m. In particular, helium beam irradiation at a peak temperature 2600 
C causes remarkably decrease of the reflectivity due to fine uneven morphology and bubble formation near-surface. The reduction of the reflectivity is considered to be mainly due to the porous structure with nano-scale hydrogen and helium bubbles.
Tokunaga, Kazutoshi*; Fujiwara, Tadashi*; Ezato, Koichiro; Suzuki, Satoshi; Akiba, Masato; Kurishita, Hiroaki*; Yoshida, Naoaki*
no journal, ,
no abstracts in English
