Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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:6 Percentile:46.16(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 10 cm, 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 () of Mn-doped ZnO follows the Curie law: = + C/T (i.e., paramagnetic) and the Curie constant C decreases to a half of that before irradiation (C = 0.012 emu cm K) at 100 MeV Xe ion fluence of 10 cm.
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:13 Percentile:65.38(Instruments & Instrumentation)no abstracts in English
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:13 Percentile:65.38(Instruments & Instrumentation)We have studied electronic- and atomic-structure modifications of polycrystalline WO films (bandgap of 3 eV) by ion irradiation. WO films were prepared by oxidation of W films on MgO substrates and of W sheets. We find disordering or amorphization, the lattice expansion of 1.5% and bandgap increase of 0.2 eV after 90 MeV Ni ion irradiation at 3 10 cm. A broad peak of optical absorption appears around 1.6 m by ion irradiation. We also find that the erosion yield by high-energy ions with the equilibrium charge exceeds 10 and that the erosion yield under ion impact with non-equilibrium charge (90 MeV Ni) is 1/5 of that with the equilibrium charge (89 MeV Ni). 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.
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:8 Percentile:50.45(Instruments & Instrumentation)Irradiation effects of CuO irradiated with 100 MeV Xe ions were studied. X-ray diffraction intensity and optical properties were analyzed.
Matsunami, Noriaki*; Kakiuchida, Hiroshi*; Tazawa, Masato*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki
no journal, ,
no abstracts in English
Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Kakiuchida, Hiroshi*
no journal, ,
no abstracts in English
Matsunami, Noriaki*; Fukushima, Jun*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Kakiuchida, Hiroshi*
no journal, ,
no abstracts in English
Matsunami, Noriaki*; Sakuma, Yasuhiro*; Sataka, Masao; Okayasu, Satoru; Kakiuchida, Hiroshi*
no journal, ,
no abstracts in English