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Journal Articles

Electronic sputtering of nitrides by high-energy ions

Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Tazawa, Masato*

Nuclear Instruments and Methods in Physics Research B, 256(1), p.333 - 336, 2007/03

 Times Cited Count:15 Percentile:70.45(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Charge state evolution of 2MeV/u sulfur ion passing through thin carbon foil

Imai, Makoto*; Sataka, Masao; Kawatsura, Kiyoshi*; Takahiro, Katsumi*; Komaki, Kenichiro*; Shibata, Hiromi*; Sugai, Hiroyuki; Nishio, Katsuhisa

Nuclear Instruments and Methods in Physics Research B, 256(1), p.11 - 15, 2007/03

 Times Cited Count:6 Percentile:45.75(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Ion-species dependence of swift heavy ion-induced ferromagnetism of Fe-50at.%Rh alloy at low temperatures

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:81.91(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.

Journal Articles

Study on irradiation-induced magnetic transition in FeRh alloys by means of Fe K-edge XMCD spectroscopy

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:73.93(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.

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