巻号一覧
26 巻, 8 号
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阿久根 忠博, 山中 哲夫, 矢野 貴之, 坂本 進洋, 渋谷 喜夫1983 年 26 巻 8 号 p. 657-662
発行日: 1983/08/20
公開日: 2009/09/29
ジャーナル フリーNiobium nitride films with high superconducting transition temperature Tc form the NaCl structure which is a stable phase only at high temperatures. Many works were reported on a method of stabilizing this metastable NaCl phase at low temperatures by doping such impurities as carbon and oxygen. For keeping substantially good nature of NbN with an estimated T of 29K, other methods free from impurities are desirable. Here quenchtechnique is tried as a first approach.
NbN films are sputtered onto sapphire substrates by magnetron sputtering and are quenched just after sputtering by thermal conduction from liq.N2-cooled anode. The relation between cooling rate and Tc, the transition width Δ Tc and the crystal structure are examined. Quenching just after deposition is useful in preparing NbN films with high Tc and narrow Δ Tc抄録全体を表示PDF形式でダウンロード (733K) -
吉村 文一, 石井 修1983 年 26 巻 8 号 p. 663-670
発行日: 1983/08/20
公開日: 2010/01/28
ジャーナル フリーThin films of γ-Fe2O3 have been studied for application in high density magnetic recording media because of their superior magnetic properties, wear resistance and chemical stability. The authors have developed a γ-Fe3O3 film preparation process consisting of three steps; a reactive sputtering step for depositing an α-Fe2O3 film in oxidizing atmospheres using an Fe alloy target a heat treatment reduction step to convert the film into a Fe2O4 phase and a subsequent oxidizing heat treatment step to obtain a γ-Fe2O3 film. The authors examined the influences of the sputtering atmosphere composition on the magnetic properties of the γ-Fe2O3 films which are related to the α-Fe2O3 film microstructures. The α-Fe2O3 films deposited in an O2 atmosphere contain a large amount of amorphous like phase that results in inferior magnetic properties. On the other hand a rather small amount of amorphous like phase is detected in the α-Fe2O3 films deposited in 20-94% Ar+O2 atmosphere. Consequently, γ-Fe2O3 films prepared by sputtering in an Ar+O2 atmosphere have higher saturation magnetization of 3000-3350 Gauss and higher coercive squareness (S*) of 0.71-0.82 than those of films prepared by sputtering in an O2 atmosphere.抄録全体を表示PDF形式でダウンロード (1663K) -
越田 信義1983 年 26 巻 8 号 p. 671-676
発行日: 1983/08/20
公開日: 2009/09/29
ジャーナル フリーGain characteristics of a microchannel plate (MCP) for positive ions with energy of 100 eV have been measured under two different operation modes : the reflection mode and the conventional transmission one. The reflection mode produces an automatic preacceleration effect on incident ions penetrating into the microchannels and therefore increases the overall gain remarkably. When an MCP with zero bias angle was used, the modal gain increased by about two orders of magnitude compared with the transmission mode and the detection efficiency would be acceptable for practical use. The reflection mode is potentially useful for the detection of low-energy positive ions.抄録全体を表示PDF形式でダウンロード (691K)
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