Takaharu Yonemoto
Kawasaki Steel Corporation
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Publication
Featured researches published by Takaharu Yonemoto.
Journal of Magnetism and Magnetic Materials | 1993
Hideaki Ono; Masashi Fujinaga; Takaharu Yonemoto; Tsugio Miyagawa; Yoko Kitano
Abstract Fe/Fe-N multilayered films were prepared by an alternation of Fe sputtering and Electron Cyclotron Resonance (ECR) nitrogen plasma exposure, and the films were investigated by 57 Fe Conversion Electron Mossbauer Spectroscopy (CEMS). ECR nitrogen plasma exposure of the sputtered Fe layers generated fine crystal ϵ-Fe 2-3 N and Fe 2 N grains, rather than thermally stable γ′-Fe 4 N. The Fe/Fe-N multilayered films has a periodic structure of [α-Fe]/[ϵ-Fe 2-3 N and Fe 2 N], and showed good soft magnetic properties.
Journal of Applied Physics | 1993
Hideaki Ono; Masashi Fujinaga; Takaharu Yonemoto; Tsugio Miyagawa
Fe‐Zr‐Co/Fe‐Zr‐Co‐N soft magnetic multilayered films were alternately prepared by Fe‐Zr‐Co alloy sputtering and electron cyclotron resonance plasma nitridation, and their magnetic properties and thermal stability were investigated. Co addition to Fe‐Zr/Fe‐Zr‐N multilayered films was effective in improving the magnetic properties of these films. The soft magnetic properties of these films demonstrated outstanding thermal stability, and it was observed that the hyperfine field Hint increased up to that for pure Fe‐Co alloy by heat treatment. Under the optimum preparation conditions, values for saturation flux density Bs of 2.02–2.06 T, coercivity Hc of 75–90 A/m, and relative permeability μ’≥3100 (at 20 MHz) were obtained in Fe84Zr8Co8/Fe84Zr8Co8‐N and Fe76Zr8Co16/Fe76Zr8Co16‐N multilayered films after annealing at 873 K for 3.6 ks.
IEEE Transactions on Magnetics | 1995
Hideaki Ono; Masashi Fujinaga; Takaharu Yonemoto; Tsugio Miyagawa; Hiroshi Yamamoto
The structures and magnetic properties of Fe/Fe-N and Fe/Cu-N multilayered films having intermediate layers containing nitrogen were investigated. Fe/Fe-N films formed by alternate Fe sputtering and electron cyclotron resonance (ECR) nitrogen plasma exposure had Fe layers containing approximately 3 at% nitrogen, the /spl alpha/-Fe(110) lattice spacing being larger than that of pure iron. This expansion of the /spl alpha/-Fe(110) lattice spacing was observed after Fe deposition. The Fe layers containing a little nitrogen improved the soft magnetic properties. Fe/Cu-N multilayered films formed by the alternation of Fe sputtering and Cu-N nitrogen reactive sputtering also showed expansion of the /spl alpha/-Fe(110) lattice spacing and reduction of the Fe crystallite size with increasing partial N/sub 2/ gas pressure (PN/sub 2/) during Cu-N reactive sputtering. The Fe/Cu-N multilayered films achieved minimum coercivity at PN/sub 2/=7%. >
Archive | 1994
Hajime Murakami; Mamoru Onda; Tatsuya Otaka; Takaharu Yonemoto; Osamu Yoshioka; 修 吉岡; 達也 大高; 護 御田; 村上 元; 隆治 米本
Journal of The Japan Institute of Metals | 1992
Hideaki Ono; Masashi Fujinaga; Takaharu Yonemoto; Tsugio Miyagawa
Archive | 1994
Hisanori Akino; Yasuharu Kameyama; Tatsuya Otaka; Shigeji Takahagi; Takaharu Yonemoto; 康晴 亀山; 達也 大高; 久則 秋野; 隆治 米本; 茂治 高萩
Archive | 1991
Takashi Ebisawa; Keiji Mashita; Tsugio Miyagawa; Ken-Ichi Sano; Junzo Takahashi; Takaharu Yonemoto; 謙一 佐野; 亜夫 宮川; 孝 海老沢; 啓治 真下; 隆治 米本; 純三 高橋
Archive | 2000
Takaharu Yonemoto; 隆治 米本
Archive | 1996
Shigeo Hagitani; Hajime Murakami; Hiroshi Sugimoto; Noriaki Takeya; Takaharu Yonemoto; Osamu Yoshioka; 修 吉岡; 洋 杉本; 村上 元; 則明 竹谷; 隆治 米本; 重男 萩谷
Archive | 1995
Hirohisa Endo; Kazuhisa Kishino; Takaharu Yonemoto; 和久 岸野; 隆治 米本; 裕寿 遠藤
