柿崎 浩一
理工学研究科 数理電子情報部門教授
工学部 電気電子物理工学科

業績情報

■ MISC
  • Annealing temperature dependences of ferroelectric and magnetic properties in polycrystalline Co-substituted BiFeO3 films               
    Hiroshi Naganuma; Jun Miura; Mitsumasa Nakajima; Hiromi Shima; Soichiro Okamura; Shintaro Yasui; Hiroshi Funakubo; Ken Nishida; Takashi Iijima; Masaki Azuma; Yasuo Ando; Kenji Kamishima; Koichi Kakizaki; Nobuyuki Hiratsuka
    巻:47, 号:9, 開始ページ:7574, 終了ページ:7578, 2008年09月
    Multiferroic Co-substituted BiFeO3 films were fabricated by chemical solution deposition method followed by post deposition annealing at various temperatures. The substitution of Cobalt of B-sites for iron in BiFeO3 was promoted at relatively high temperatures. The B-site substitution by cobalt promoted increases in saturation magnetization and spontaneous magnetization By substitution. leakage Current density Was suppressed ill a high-electric-field region and ferroelectric hysteresis (P-E) loops became measurable even at room temperature. The optimal annealing temperature for the coexistence of a high remanent polarization and a high remanent magnetization was 923 K having a high B-site substitution ratio of cobalt.
    英語
    DOI:https://doi.org/10.1143/JJAP.47.7574
    DOI ID:10.1143/JJAP.47.7574, ISSN:0021-4922, eISSN:1347-4065, CiNii Articles ID:150000051394, Web of Science ID:WOS:000259657800024
  • Simple process synthesis of BaTiO3-(Ni,Zn,Cu)Fe2O4 ceramic composite               
    Kenji Kamishima; Yoshitaka Nagashima; Koichi Kakizaki; Nobuyuki Hiratsuka; Kowashi Watanabe; Takaya Mise; Hiroshi Naganuma; Soichiro Okamura
    巻:77, 号:6, 開始ページ:4, 2008年06月
    Ceramic composites (2Ni(0.41)Zn(0.41)Cu(0.18)Fe(2)O(4)-BaTiO3) were successfully prepared by a direct solid-state reaction of raw materials (BaCO3, CuO, alpha-Fe2O3, NiO, TiO2, and ZnO). X-ray diffraction (XRD) and electron probe micro analysis (EPMA) measurements were performed for these samples and it is confirmed that the composites consist of spinel ferrite and BaTiO3 phases. The composites are so homogeneous that the ferrite and BaTiO3 grains do not react with each other and have radii in the range of 1-5 mu m. Hexagonal BaTiO3 (h-BaTiO3) can be made in this composite form with a sintering temperature of 1200 degrees C, although h-BaTiO3 can be usually synthesized above 1460 degrees C. The freezing-point depression of BaTiO3 takes place due to the mixing with the spinel ferrite, which may result in the formation of h-BaTiO3 at a low temperature of 1200 degrees C.
    英語
    DOI:https://doi.org/10.1143/JPSJ.77.064801
    DOI ID:10.1143/JPSJ.77.064801, ISSN:0031-9015, Web of Science ID:WOS:000256893800041
  • Ferroelectric and magnetic properties of multiferroic BiFeO3-Based composite films               
    Hiroshi Naganuma; Tomosato Okubo; Kenji Kamishima; Koichi Kakizaki; Nobuyuki Hiratsuka; Soichiro Okamura
    巻:55, 号:5, 開始ページ:1051, 終了ページ:1055, 2008年05月
    BiFeO3-based composite films were fabricated onto the Pt/Ti/SiO2/Si(100) substrates by a chemical solution deposition (CSD) method using the precursor solutions with various excess iron composition followed by annealing at 923 K for 30 minutes under oxygen gas flow. Coexistence of spontaneous magnetization and remanent polarization could be obtained in the BiFeO3-based composite films with high excess iron composition. The remanent magnetization of almost 20 emu/cm(3) and the magnetic coercive field of 1.5 kOe were obtained at the iron composition ratio of Fe/Bi = 1.25. In this specimen, the remanent polarization at 90 K was approximately 10 mu C/cm(2) at the electric field of 1500 kV/cm. Structural analysis suggested that the remanent polarization has a possibility to increase by suppressing the formation of the secondary phases of Bi2Fe4O9 and alpha-Fe2O3, these are the nonferroelectric material as well as antiferromagnetic phase.
    英語
    DOI:https://doi.org/10.1109/TUFFC.2008.755
    DOI ID:10.1109/TUFFC.2008.755, ISSN:0885-3010, CiNii Articles ID:120002070232, PubMed ID:18519211, Web of Science ID:WOS:000255537600021
  • 超低熱膨張性と排ガス浄化能を有する複合機能性ゼオライト多孔体の創製<研究成果報告>               
    柳瀬 郁夫; 柿崎 浩一; 小林 秀彦
    埼玉大学紀要, 工学部, 第1部論文集, 巻:1, 号:38, 開始ページ:128, 終了ページ:131, 2005年
  • 超低熱膨張性と排ガス浄化能を有する複合機能性ゼオライト多孔体の創製<研究成果報告>               
    柳瀬 郁夫; 柿崎 浩一; 小林 秀彦
    巻:1, 号:38, 開始ページ:128, 終了ページ:131, 2005年
  • The effect of AIN underlayer on c-axis orientation of barium ferrite thin films for perpendicular magnetic recording media               
    K.Kakizaki; H.Watanabe; N.Hiratsuka
    J.Magn.Magn., Mat., 巻:235, 号:1/3, 開始ページ:169, 終了ページ:173, 2001年
    DOI:https://doi.org/10.1016/S0304-8853(01)00331-6
    DOI ID:10.1016/S0304-8853(01)00331-6, ISSN:0304-8853, CiNii Articles ID:80012712958
  • The effect of AIN underlayer on c-axis orientation of barium ferrite thin films for perpendicular magnetic recording media               
    K.Kakizaki; H.Watanabe; N.Hiratsuka
    巻:235, 号:1/3, 開始ページ:169, 終了ページ:173, 2001年
    DOI:https://doi.org/10.1016/S0304-8853(01)00331-6
    DOI ID:10.1016/S0304-8853(01)00331-6, ISSN:0304-8853, CiNii Articles ID:80012712958
  • Magnetic Properties and Crystal orientation of La-Co Substituted Barium Ferrite Thin Films               
    K.Kakizaki; H.Taguchi; H.Nishio; N.Hiratsuka
    Proc.8th.Int.Conf on Ferrites, 開始ページ:636, 終了ページ:638, 2000年
  • Pb置換Baフェライト薄膜の磁気特性               
    柿崎浩一; 平塚信之
    日本応用磁気学会誌, 巻:24, 号:4-2, 開始ページ:519, 終了ページ:522, 2000年
    The effects of substituting Ba ions for Pb ions on low temperature preparation of barium ferrite thin films and on their magnetic properties were investigated. Ba1-XPbXFe12O19 thin films were deposited on a fused quartz substrate by an rf magnetron sputtering method. In order to control the composition of the deposited Ba1-XPbXFe12O19 films, several sintered BaFe2O4 chips and PbO chips were placed on the barium ferrite target. The film thickness was varied between 20 and 250 nm. As-deposited films were post-annealed at temperatures between 500 and 700°C for 5 hours in air.
    Ba1-XPbXFe12O19 films with Pb content of 0.24 or above were well crystallized by post-annealing at 550°C for 5 hours in air. Ba0.65Pb0.35Fe12O19 film, especially, showed excellent magnetic properties, and its grains were small and uniform. As the film thickness of Ba0.65Pb0.35Fe12O19 film was decreased, its coercivity increased; its value reached 5.0 kOe at t = 50 nm. Moreover, the Ba0.65Pb0.35Fe12O19 film had little interaction between grains and high thermal stability of magnetization.
    The Magnetics Society of Japan, 日本語
    DOI:https://doi.org/10.3379/jmsjmag.24.519
    DOI ID:10.3379/jmsjmag.24.519, ISSN:0285-0192, CiNii Articles ID:110002810723, CiNii Books ID:AN0031390X
  • Magnetic Properties and Crystal orientation of La-Co Substituted Barium Ferrite Thin Films               
    K.Kakizaki; H.Taguchi; H.Nishio; N.Hiratsuka
    開始ページ:636, 終了ページ:638, 2000年
  • Pb置換Baフェライト薄膜の磁気特性               
    柿崎 浩一; 平塚 信之
    日本応用磁気学会誌, 巻:24, 号:4-2, 開始ページ:519, 終了ページ:522, 2000年
    The effects of substituting Ba ions for Pb ions on low temperature preparation of barium ferrite thin films and on their magnetic properties were investigated. Ba1-XPbXFe12O19 thin films were deposited on a fused quartz substrate by an rf magnetron sputtering method. In order to control the composition of the deposited Ba1-XPbXFe12O19 films, several sintered BaFe2O4 chips and PbO chips were placed on the barium ferrite target. The film thickness was varied between 20 and 250 nm. As-deposited films were post-annealed at temperatures between 500 and 700°C for 5 hours in air.
    Ba1-XPbXFe12O19 films with Pb content of 0.24 or above were well crystallized by post-annealing at 550°C for 5 hours in air. Ba0.65Pb0.35Fe12O19 film, especially, showed excellent magnetic properties, and its grains were small and uniform. As the film thickness of Ba0.65Pb0.35Fe12O19 film was decreased, its coercivity increased; its value reached 5.0 kOe at t = 50 nm. Moreover, the Ba0.65Pb0.35Fe12O19 film had little interaction between grains and high thermal stability of magnetization.
    The Magnetics Society of Japan, 日本語
    DOI:https://doi.org/10.3379/jmsjmag.24.519
    DOI ID:10.3379/jmsjmag.24.519, ISSN:0285-0192, CiNii Articles ID:110002810723, CiNii Books ID:AN0031390X
  • Magnetic Properties and Crystal Structure of Acicular Barium Ferrite Particles.               
    K.Kakizaki; N.Hiratsuka
    J.Mag.Soc.Jpn., 巻:22, 号:S1, 開始ページ:129, 終了ページ:131, 1998年
  • Magnetic Properties and Crystal Structure of Acicular Barium Ferrite Particles.               
    K.Kakizaki; N.Hiratsuka
    巻:22, 号:S1, 開始ページ:129, 終了ページ:131, 1998年
  • Fine Structure of Acicular BaCoxTixFe12-2xO19 Particles and Their Magnetic Properties.               
    K.Kakizaki; N.Hiratsuka
    J.Magn.Magn.Mat., 巻:176, 号:1, 開始ページ:36, 終了ページ:40, 1997年
    DOI:https://doi.org/10.1016/S0304-8853(97)00634-3
    DOI ID:10.1016/S0304-8853(97)00634-3, ISSN:0304-8853, CiNii Articles ID:80010050137
  • Fine Structure of Acicular BaCoxTixFe12-2xO19 Particles and Their Magnetic Properties.               
    K.Kakizaki; N.Hiratsuka
    巻:176, 号:1, 開始ページ:36, 終了ページ:40, 1997年
    DOI:https://doi.org/10.1016/S0304-8853(97)00634-3
    DOI ID:10.1016/S0304-8853(97)00634-3, ISSN:0304-8853, CiNii Articles ID:80010050137
  • ZnO-SnO_2系複合酸化物のイソブタンガス感度特性               
    平塚 信之; 細井 明子; 小林 裕; 柿崎 浩一
    日本セラミックス協会学術論文誌, 巻:104, 号:1216, 開始ページ:1158, 終了ページ:1159, 1996年
    DOI:https://doi.org/10.2109/jcersj.104.1158
    DOI ID:10.2109/jcersj.104.1158
  • ZnO-SnO_2系複合酸化物のイソブタンガス感度特性               
    平塚 信之; 細井 明子; 小林 裕; 柿崎 浩一
    巻:104, 号:1216, 開始ページ:1158, 終了ページ:1159, 1996年
    DOI:https://doi.org/10.2109/jcersj.104.1158
    DOI ID:10.2109/jcersj.104.1158
■ 論文指導
  • 2008, 学士課程, 指導学生数計:4, 指導学生数(内留学生):1
  • 2008, 博士前期(専門職学位)課程, 指導学生数計:1, 指導学生数(内留学生):0
■ 共同研究・競争的資金等の研究課題
  • 磁気抵抗材料に関する研究               
    2003年
    競争的資金
  • Study on magneto-resistance effect for magnetic thin films               
    2003年
    競争的資金
  • 軟磁性グラニュラー薄膜に関する研究               
    2002年
    競争的資金
  • Study on soft magnetic thin films with granular structure               
    2002年
    競争的資金
  • 高密度磁気記録媒体に関する研究               
    1995年
    高密度磁気記録媒体の研究を行っている。これまで,針状形状のバリウムフェライト微粒子を合成し,これを用いた磁気テープの磁気特性及び電磁変換特性を評価してきた。また,この針状微粒子の微細構造についても明らかにした。現在は次世代の超高密度磁気記録に応用可能なバリウムフェライト簿膜及びFePt系グラニュラー薄膜の作製及び磁気特性に関する研究を行っている。
    競争的資金
  • Study on high density magnetic recording media               
    1995年
    競争的資金
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