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Mn
)O
Shinoda, Ryoichi*; Ito, Masayoshi*; Sakurai, Yoshiharu*; Yamamoto, Hiroyuki; Hirao, Norie; Baba, Yuji; Iwase, Akihiro*; Matsui, Toshiyuki*
Journal of Applied Physics, 113(17), p.17E307_1 - 17E307_3, 2013/05
Times Cited Count：9 Percentile：37.98(Physics, Applied)We revealed that the Ba(CoMn)O (BCMO) ceramic samples exhibited ferromagnetic-dielectric behavior below the magnetic transition temperature of about 35 K. The origin of their magnetic ordering was expected to super-exchange coupling of Co
(
)-O
-Mn (
) with bonding angle of 180
. and/or Mn()-O-Mn () with bonding angle of 90. The magnetic spin momentum estimated by the magnetic Compton profiles (MCP) of the samples had similar temperature dependence as that determined by the SQUID measurement, which meant that the observed magnetic moments could be ascribed to the spin moment. The shapes of the MCPs of the samples were completely same regardless of the temperature measured. This result indicates that there are no changes of the momentum space distribution of spin density between ferromagnetic and paramagnetic states. So, this magnetic transition is simply caused by a thermal fluctuation of the spin.
and TbFeYoneda, Yasuhiro; Kohara, Shinji*; Ito, Masayoshi*; Abe, Hiroshi; Takeuchi, Mitsuaki*; Uchida, Hirohisa*; Matsumura, Yoshihito*
Transactions of the Materials Research Society of Japan, 38(1), p.109 - 112, 2013/03
We performed local structure analysis of SmFe and TbFe in the crystallization process from amorphous by using synchrotron X-ray pair-distribution function (PDF) method. The giant mangetostrictive materials of these compounds can be controlled its property by ion irradiation. In amorphous TbFe and SmFe, the mosaic block size was small and the short-range order structure owing to Fe-Fe network maintained. In crystalline SmFe, a rigid long-range order structure of Fe-Fe and Sm-Sm network coexisted and it had a large mosaic block size. On the other hand, in crystalline TbFe, Fe-Fe network degraded by Tb-Tb network owing to its lattice tolerance.
Sakurai, Hiroshi*; Ito, Masayoshi*; Agui, Akane
Magune, 6(5), p.270 - 276, 2011/10
no abstracts in English
Co
film by magnetic Compton scatteringAgui, Akane; Matsumoto, Sayaka*; Sakurai, Hiroshi*; Tsuji, Naruki*; Homma, Satoshi*; Sakurai, Yoshiharu*; Ito, Masayoshi*
Applied Physics Express, 4(8), p.083002_1 - 083002_3, 2011/08
Times Cited Count：14 Percentile：51.56(Physics, Applied)We have succeeded in measuring microscopic magnetic hysteresis loop of amorphous TbCo film. Spin selective magnetic hysteresis (SSMH) loop was measured by magnetic Compton scattering at synchrotron radiation facility SPring-8 and obtaining orbital selective magnetic hysteresis (OSMH) loop was firstly obtained by combining with result of macroscopic magnetic hysteresis loop.
Kosugi, Shinya*; Matsui, Toshiyuki*; Ishikawa, Norito; Ito, Masayoshi*; Sakurai, Yoshiharu*; Aiko, Kazuma*; Shimizu, Hirotaka*; Tahara, Yuki*; Hori, Fuminobu*; Iwase, Akihiro*
Journal of Applied Physics, 109(7), p.07B737_1 - 07B737_3, 2011/04
Times Cited Count：7 Percentile：31.23(Physics, Applied)The magnetic Compton profiles of FeRh intermetallic compound were measured to study the ferromagnetism induced by 200 MeV Xe ion irradiation. The magnetic effect at 50 K increases with increasing the ion-fluence. The analysis of the experimental result revealed that the values of spin moment induced by the irradiation were close to the values of magnetization obtained by a superconducting quantum interference device magnetometer, suggesting that the ion irradiation mainly induces the spin magnetic moment.
Agui, Akane; Matsumoto, Sayaka*; Sakurai, Yoshiharu*; Ito, Masayoshi*; Homma, Satoshi*; Tsuji, Naruki*; Sakurai, Hiroshi*
no journal, ,
no abstracts in English
Agui, Akane; Matsumoto, Sayaka*; Sakurai, Hiroshi*; Homma, Satoshi*; Tsuji, Naruki*; Sakurai, Yoshiharu*; Ito, Masayoshi*
no journal, ,
no abstracts in English
Sakurai, Hiroshi*; Agui, Akane; Matsumoto, Sayaka*; Ito, Masayoshi*; Sakurai, Yoshiharu*
no journal, ,
no abstracts in English
Ueno, Hiroki; Kawakita, Yukinobu; Ohara, Koji*; Shimakura, Hironori; Tahara, Shuta*; Kumara, L. S. R.*; Yamaguchi, Hiroshi*; Yasunaga, Akinori*; Wakisaka, Yuiko*; Ito, Masayoshi*; et al.
no journal, ,
Bi-Zn system has a phase diagram with a miscibility gap where critical point is at Bi
Zn
. It is known that concentration fluctuation increases on approaching to the miscibility gap. Earlier studies suggested that the miscibility gap is attributed to difference in atomic size between Bi and Zn. Recent developments of instrument and analysis technique enable us to deduce partial structures and demonstrate atomic configurations in liquid. We performed detailed analysis on medium-range structure in liquid Bi
Zn by using neutron diffraction data obtained by the two-axis diffractometer, HERMES, installed in JRR-3M, JAEA and, X-ray diffraction at BL08W beamline in SPring-8, Hyogo, Japan. 3D atomic structural model obtained by Revere Monte Carlo technique exhibits temperature evolution of concentration fluctuations in medium-range structure, which suggests that phase separation tendency appears even in the edge of the miscibility gap of liquid Bi-Zn.
Ueno, Hiroki; Kawakita, Yukinobu; Ohara, Koji*; Tahara, Shuta*; Kohara, Shinji*; Ito, Masayoshi*; Takeda, Shinichi*
no journal, ,
no abstracts in English
Ueno, Hiroki; Kawakita, Yukinobu; Ohara, Koji*; Tahara, Shuta*; Kohara, Shinji*; Ito, Masayoshi*; Takeda, Shinichi*
no journal, ,
Minegishi, Katsuhiko*; Agui, Akane; Sakurai, Hiroshi*; Ito, Masayoshi*; Sakurai, Yoshiharu*
no journal, ,
no abstracts in English
