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22 巻, 6 号
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古谷野 有, 池田 博, 吉崎 亮造, 田崎 明1998 年 22 巻 6 号 p. 1069-1073
発行日: 1998年
公開日: 2007/06/29
ジャーナル オープンアクセスFoils of the γ-FeN phase were prepared by the conventional gas nitrification method in an NH3 + H2 atmosphere. We found the γ-FeN phase field extends beyond 11.1 at%N at 660°C, which is the stoichiometric composition of Fe16N2. The γ-FeN phase with 9.8 at%N is transformed into a mixture of the α' and γ phases by cooling to below 180 K. An intense external magnetic field at 4.2 K is found to drive the martensitic transformation occurring in the γ phase, and a field of 170 kOe reduces the amount of residual γ phase from 38% to 16%. This results in a drastic increase in the spontaneous magnetization from 147 emu/g to 198 emu/g.抄録全体を表示PDF形式でダウンロード (357K) -
池田 満昭, 上村 浩司, 佐々木 巌, 毛利 佳年雄1998 年 22 巻 6 号 p. 1074-1079
発行日: 1998年
公開日: 2007/06/29
ジャーナル オープンアクセスThe sputtering technique was used to prepare Ni-Fe magnetostrictive films on Ti-alloy shafts. The factors affecting the output characteristics of the torque sensors are studied as functions of the circuit parameters, the shapes of patterns, and the compositions of Ni-Fe films. The sensitivity of a torque sensor is proportional to the frequency of the circuit, the pattern width, and the film thickness. The optimal value of the Ni content in Ni-Fe films was found theoretically and experimentally in order to realize maximum sensitivity in torque sensing.抄録全体を表示PDF形式でダウンロード (333K) -
菅 大肋, 新城 明久, 稲嶺 一樹, 仲田 正, 荷川取 秀樹1998 年 22 巻 6 号 p. 1080-1084
発行日: 1998年
公開日: 2007/06/29
ジャーナル オープンアクセスThis paper describes the orientation of demembranated and nuclear-decondensed cattle sperm treated with 1% glutaraldehyde in a 5400-G static magnetic field. The sperm collected from four bulls was mixed with the same sperm density. One-percent triton X-100 was used to extract the sperm plasma membrane, while 10 mM dithiothreitol and heparin sodium were used to decondense the sperm nucleus. The intact, demembranated, and nuclear-decondensed sperm non-treated or treated with glutaraldehyde were exposed continuously for 24 hours to a 5400-G magnetic field at 25°C. The demembranation and treatment with glutaraldehyde enhanced the orientation of the sperm. However, nuclear-decondensed sperm, as well as non-exposed sperm, had a very low perpendicularly oriented percentage, while the flagella showed low parallel orientation. These findings suggest that the magnetization of cattle sperm heads occurs in the chromatin.抄録全体を表示PDF形式でダウンロード (360K) -
水嶋 隆夫, 吉田 昌二, 牧野 彰宏, 井上 明久1998 年 22 巻 6 号 p. 1085-1089
発行日: 1998年
公開日: 2007/06/29
ジャーナル オープンアクセスThe compositional dependence of the glass-forming ability and magnetic properties of Fe-Al-Ga-P-C-B- (Si) glassy alloys was investigated. The saturation magnetization (σs) increase with increasing Fe content. While the maximum thickness for glass formation (tmax) decreases when the (P, C, B) is replaced by Fe, it hardly does so when the (Al, Ga) is replaced by Fe. When P is replaced by Si, tmax increases. As a result, a high σs of 207 × 10-6 Wbm kg-1 and a large tmax of 220 μm were simultaneously obtained in a Fe77Al2.14Ga0.86P8.4C5B4Si2.6 glassy alloy. The core loss of this glassy alloy with a smaple thickness of 100μm at f=50 Hz and Bm = 1.0 T was 0.22 Wkg, which is lower than those of 6.5%Si-Fe alloy and amorphous Fe78Si9B13 alloy with the same sample thickness. Therefore, it can be said that the Fe-Al-Ga-P-C-B-Si glassy alloys are useful for inductive applications.抄録全体を表示PDF形式でダウンロード (346K) -
M. Kitagawa, K. K. Choi, K. . Nakano, Y. Y. Yamazaki1998 年 22 巻 6 号 p. 1090-1093
発行日: 1998年
公開日: 2007/06/29
ジャーナル オープンアクセスhe effects of Mn excess and deficiency on the magnetoresistive properties of La-Sr-Mn-O thin films were investigated. Epitaxial and textured films of La0.72Sr0.28MnyO3-δ (y: 0.86-1.58) were prepared by rf sputtering on (100) SrTiO3 and (110) sapphire single crystal substrates, respectively. The resistivity of the epitaxial films was less than 10% of that of the textured films, and the resistivity of all the films decreased with increasing Mn content. The Mn content and substrate material affected the temperature dependence of the magnetoresistance as well as the crystal quality of the films. The nonstoichiometry of manganese played a significant role in the electric and magnetic properties of La-Sr-Mn-O thin films.抄録全体を表示PDF形式でダウンロード (289K)
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