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Journal Articles

Ion induced modifications of Mn-doped ZnO films

Matsunami, Noriaki*; Ito, M.*; Kato, M.*; Okayasu, Satoru; Sataka, Masao*; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 365(Part A), p.191 - 195, 2015/12

 Times Cited Count:4 Percentile:55.82(Instruments & Instrumentation)

We have studied ion impact effects on atomic structure in terms of X-ray diffraction (XRD), optical absorption and electrical resistivity of Mn (6%)-doped ZnO films under 100 MeV Xe ion impact at room temperature. We find the monotonic reduction of the XRD intensity to 1/50 of that of unirradiated film at 5 $$times$$10$$^{14}$$ cm$$^{-2}$$, little bandgap change ($$<$$0.02 eV) and decrease of the resistivity by 4 order of magnitude. The resistivity modification has been compared with that by irradiations of low energy ions such as 100 keV Ne and N, which show more effective decrease of resistivity. We also find that temperature (T) dependence of the magnetic susceptibility ($$chi$$) of Mn-doped ZnO follows the Curie law: $$chi$$ = $$chi$$$$_{o}$$ + C/T (i.e., paramagnetic) and the Curie constant C decreases to a half of that before irradiation (C$$_{O}$$ = 0.012 emu cm$$^{-3}$$ K) at 100 MeV Xe ion fluence of 10$$^{12}$$ cm$$^{-2}$$.

Journal Articles

Electrical property modifications of In-doped ZnO Films by ion irradiation

Matsunami, Noriaki*; Fukushima, Junichi*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 268(19), p.3071 - 3075, 2010/10

 Times Cited Count:12 Percentile:31.38(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Ion irradiation effects on tungsten-oxide films and charge state effect on electronic erosion

Matsunami, Noriaki*; Sataka, Masao*; Okayasu, Satoru; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 268(19), p.3167 - 3170, 2010/10

 Times Cited Count:9 Percentile:41.34(Instruments & Instrumentation)

We have studied electronic- and atomic-structure modifications of polycrystalline WO$$_{3}$$ films (bandgap of $$sim$$ 3 eV) by ion irradiation. WO$$_{3}$$ films were prepared by oxidation of W films on MgO substrates and of W sheets. We find disordering or amorphization, the lattice expansion of $$sim$$ 1.5% and bandgap increase of 0.2 eV after 90 MeV Ni ion irradiation at $$sim$$ 3 $$times$$ 10$$^{12}$$ cm$$^{2}$$. A broad peak of optical absorption appears around 1.6 $$mu$$m by ion irradiation. We also find that the erosion yield by high-energy ions with the equilibrium charge exceeds 10$$^{4}$$ and that the erosion yield under ion impact with non-equilibrium charge (90 MeV Ni$$^{+10}$$) is $$sim$$ 1/5 of that with the equilibrium charge (89 MeV Ni$$^{+19}$$). Effects of depth dependence of the ion mean charge on the erosion yields are discussed. The erosion yield by low-energy ions is also presented.

Journal Articles

High-energy ion irradiation effects on atomic structures and optical properties of copper oxide and electronic sputtering

Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Ishikawa, Norito; Tazawa, Masato*; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 266(12-13), p.2986 - 2989, 2008/06

 Times Cited Count:6 Percentile:54.25(Instruments & Instrumentation)

Irradiation effects of Cu$$_{2}$$O irradiated with 100 MeV Xe ions were studied. X-ray diffraction intensity and optical properties were analyzed.

Oral presentation

Ion irradiation effects on Cu$$_{3}$$N films and phase separation

Matsunami, Noriaki*; Kakiuchida, Hiroshi*; Tazawa, Masato*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Ion irradiation effects on tungsten-oxide films and charge state effect on electronic erosion

Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Kakiuchida, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Ion irradiation effect of In-doped ZnO

Matsunami, Noriaki*; Fukushima, Jun*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Kakiuchida, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Ion irradiation effects on copper-oxide(CuO) films

Matsunami, Noriaki*; Sakuma, Yasuhiro*; Sataka, Masao; Okayasu, Satoru; Kakiuchida, Hiroshi*

no journal, , 

no abstracts in English

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