Eiichi Hirota
Panasonic
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Publication
Featured researches published by Eiichi Hirota.
Japanese Journal of Applied Physics | 1970
Eiichi Hirota; Toshihiro Mihara; Tadashi Kawamata; Mitsuru Asanuma
The solubility limit of Fe-ion in CrO2 and the properties of (Cr1-xFex)O2 were examined. Added Fe-ions dissolve into CrO2 and form an oxide of (Cr1-2x4+Crx5+Fex3+)O2, up to the x-value of about 0.06. The Tc increases from 116°C for the pure CrO2 to about 155°C with an Fe-addition of x=0.06. The magnetic moments of Fe3+ and Cr5+ couple in anti-parallel way to that of Cr4+.
Japanese Journal of Applied Physics | 1966
Eiichi Hirota
The effects of the addition of CaO and GeO2 in iron excess Mn-Zn-ferrites were investigated for improving the high frequency loss property. The µQ value of 8×104 with µ of 700 at 1 Mc/s was obtained. The low loss property is attributed to its high resistivity caused by the addition of CaO and GeO2, followed by the domain wall stabilization by an induced anisotropy.
Applied Physics Letters | 1976
Haruhumi Senno; Yoshio Tawara; Eiichi Hirota
It was found that sintered alloys having a composition of approximately z=8 in Sm(Co0.85Fe0.05Cu0.10)z exhibit a high coercive force on the order of 10 kOe, for 5–10‐μm average grain size. Magnetization and demagnetization curves showed that the coercive force is controlled by a nucleation process. Attempts were made to achieve a high density without serious grain growth by means of high‐pressure isostatic compaction and hot pressing, resulting in 96% of the density and 7‐μm average grain size. With this approach, Br=10.3kG, IHc=10.2 kOe, and a maximum energy product of 22.0 MG Oe were achieved.
Japanese Journal of Applied Physics | 1987
Hiroshi Sakakima; Michel Tessier; Ramanathan Krishnan; Eiichi Hirota
Compositionally modulated Co/Mn thin films with layer thickness ranging from 7-70 A were prepared by UHV evaporation. The artificial periodicity was confirmed by small-angle X-ray diffraction. Magnetization of the CMF was found to decrease below a certain transition temperature and anomalous magnetization processes were observed at low temperatures.
Archive | 2001
Hiroshi Sakakima; Eiichi Hirota; Yasuhiro Kawawake; Mitsuo Satomi; Yasunari Sugita
Archive | 1982
Noboru Nomura; Eiichi Hirota; Kiyotaka Wasa
Archive | 1980
Harufumi Senno; Hiroshi Sakakima; Yukihiro Yanagiuchi; Tsuneo Inoue; Masatsugu Yamaguchi; Eiichi Hirota
Archive | 1982
Yukihiro Yanagiuchi; Eiichi Hirota; Hiroshi Sakakima; Harufumi Senno
Archive | 1967
Hiroyuki Chiba; Eiichi Hirota; Yoshio Tawara
Archive | 1981
Hiroshi Sakakima; Mitsuo Satomi; Harufumi Senno; Eiichi Hirota