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Fujita, Naoki*; Kosugi, Shinya*; Zushi, Yoshihiro*; Matsui, Toshiyuki*; Saito, Yuichi; Iwase, Akihiro*
Nuclear Instruments and Methods in Physics Research B, 267(6), p.921 - 924, 2009/04
Times Cited Count：9 Percentile：53.42(Instruments & Instrumentation)Hori, Fuminobu*; Fukuzumi, Masafumi*; Kawasuso, Atsuo; Zushi, Yoshihiro*; Chimi, Yasuhiro; Ishikawa, Norito; Iwase, Akihiro*
Physica Status Solidi (C), 4(10), p.3530 - 3533, 2007/09
Times Cited Count：0 Percentile：0.07(Physics, Atomic, Molecular & Chemical)no abstracts in English
Zushi, Yoshihiro*; Fukuzumi, Masafumi*; Chimi, Yasuhiro; Ishikawa, Norito; Ono, Fumihisa*; Iwase, Akihiro*
Nuclear Instruments and Methods in Physics Research B, 256(1), p.434 - 437, 2007/03
Times Cited Count：23 Percentile：81.67(Instruments & Instrumentation)Fe-50at.%Rh alloys were irradiated with swift heavy ions such as 120 MeV Ni, 150 MeV Kr, 200 MeV Xe, 200 MeV Au, and it is found that low-temperature antiferromagnetic state changes to ferromagnetic state after the irradiations. The ion-fluence dependence and ion-species dependence was investigated. It is found that saturated magnetization evolves as fluence increases, and the evolution behavior for different ion-species differs from each other, but it scales with single universal curve as a function of total energy deposition via elastic collision.
Iwase, Akihiro*; Fukuzumi, Masafumi*; Zushi, Yoshihiro*; Suzuki, Motohiro*; Takagaki, Masafumi*; Kawamura, Naomi*; Chimi, Yasuhiro; Mizuki, Junichiro; Ishikawa, Norito; Ono, Fumihisa*
Nuclear Instruments and Methods in Physics Research B, 256(1), p.429 - 433, 2007/01
Times Cited Count：17 Percentile：73.65(Instruments & Instrumentation)We have studied the effects of swift heavy ion irradiation on the magnetic properties of Fe-Rh intermetallic compound by using Fe K-edge X-ray magnetic circular dichroism (XMCD) at 20 K. For an unirrdaiated specimen, no signal of XMCD spectrum has been observed because Fe-Rh intermetallic compound is intrinsically anti-ferromagnetic below room temperature. For the specimens irradiated with 120-200 MeV Ni, Kr, Xe or Au ions, we have found XMCD spectra which are characterized by a dispersion-type profile with a positive peak and a negative peak near Fe K-edge. The intensity of XMCD spectra remarkably depends on ion-fluence and ion-mass. The experimental result implies that the ferromagnetic state is induced by the swift heavy ion irradiation. The change in magnetic state of Fe element is discussed in terms of energy deposition through the elastic and electronic processes.
Iwase, Akihiro*; Zushi, Yoshihiro*; Nakatani, Tomoya*; Fujita, Naoki*; Hori, Fuminobu*; Oshima, Ryuichiro*; Seki, Shuhei*; Saito, Yuichi; Chiba, Atsuya; Adachi, Masahiro; et al.
no journal, ,
no abstracts in English
Ishikawa, Norito; Kawasuso, Atsuo; Takagaki, Masafumi*; Suzuki, Motohiro*; Mizuki, Junichiro; Zushi, Yoshihiro*; Fujita, Naoki*; Hori, Fuminobu*; Seki, Shuhei*; Tsukuda, Satoshi*; et al.
no journal, ,
It is already found that magnetic transition temperature of Fe-50at.%Rh changes by high-energy ion irradiation. This irradiation-induced changes in magnetic properties has been investigated by magnetic force microscopy. It has been found that microscopic magnetic structure appears after ion-irradiation, and the structure changes depending on the ion-fluence. The observed structure was not the same as that observed for Fe-rich ferromagnetic Fe-45at.%Rh alloys.
" by means of synchrotron radiationOno, Hirotaka*; Maeda, Nobuhiro*; Nakagawa, Sho*; Zushi, Yoshihiro*; Iwase, Akihiro*; Baba, Yuji; Hirao, Norie*; Ishikawa, Norito; Chimi, Yasuhiro; Sataka, Masao; et al.
no journal, ,
X-ray absorption spectroscopy is applied for evaluation of heavy ion irradiation effects in sim-fuel CeO in order to investigate the radiation damage of nuclear fuels bombarded by fission fragments. It is found that oxygen atoms are displaced via elastic displacement process, and the charge state of Ce changes from 4+ to 3+.
