研究者業績

小舟 正文

コブネ マサフミ  (Masafumi Kobune)

基本情報

所属
兵庫県立大学 大学院 工学研究科 (名誉教授・特任教授)
学位
工学博士(姫路工業大学)

J-GLOBAL ID
200901056320971482
researchmap会員ID
1000057679

論文

 149
  • Tsubasa Migita, Masafumi Kobune, Kengo Matsumoto, Yuuri Takeuchi, Hironori Fujisawa, Kensuke Kanda, Kazusuke Maenaka
    Japanese Journal of Applied Physics 60(SF) SFFB06-SFFB06 2021年11月1日  査読有り責任著者
  • Tsubasa Migita, Masafumi Kobune, Ryoga Ito, Taiki Obayashi, Hideyuki Takasaki, Ryo Ito, Takeyuki Kikuchi, Hironori Fujisawa, Kensuke Kanda, Kazusuke Maenaka, Yamato Hayashi
    Japanese Journal of Applied Physics 59(SP) SPPB08-SPPB08 2020年11月1日  査読有り責任著者
    © 2020 The Japan Society of Applied Physics. Microrod-type CoFe2O4(CFO)/Bi3.25Nd0.65Eu0.10Ti3O12(00ℓ) (BNEuT) composite thin films were fabricated by a combination of high-temperature sputtering, reactive ion etching, and metal organic chemical vapor deposition (MOCVD) on Pt(100)/MgO(100) substrates. The substrate temperature for MOCVD was varied from 450 °C to 600 °C to examine its effect on the structural, magnetic, and ferroelectric properties. The substrate temperature affects the compressive stress at the interface between the CFO and BNEuT. The surface morphology changed drastically above 550 °C. The room temperature magnetization-magnetic field hysteresis loops for the films showed clear ferromagnetic hysteresis loop and magnetic shape anisotropy. The room temperature polarization-electric field (P-E) hysteresis loops for the films showed a clear ferroelectric hysteresis loop, and slightly leaky P-E hysteresis loop. The coercive field increased slightly with increasing substrate temperature. Judging from the structural, ferromagnetic, and ferroelectric properties, the film deposited at 550 °C has potential as an excellent multiferroic material.
  • Masafumi Kobune, Masamitsu Yoshii, Hideyuki Takasaki, Ryo Ito, Tsubasa Migita, Kensuke Kanda, Kazusuke Maenaka, Yamato Hayashi
    Japanese Journal of Applied Physics 59(SP) SPPB06-SPPB06 2020年11月1日  査読有り筆頭著者
  • T.Obayashi, M.Kobune, T.Matsunaga, R.Ito, T.Migita, T.Kikuchi, K.Kanda, K.Maenaka
    Trans. Mat. Res. Soc. Japan 45(2) 31-34 2020年4月  査読有り責任著者
  • Tsubasa Migita, Masafumi Kobune, Ryoga Ito, Taiki Obayashi, Takeyuki Kikuchi, Hironori Fujisawa, Kensuke Kanda, Kazusuke Maenaka, Hiroshi Nishioka, Naoki Fukumuro, Shinji Yae
    Japanese Journal of Applied Physics 59(SC) SCCB10-SCCB10 2020年2月1日  査読有り責任著者
    Using a a-axis-oriented epitaxial (Bi3.25Nd0.65Eu0.10)Ti3O12 (BNEuT) thin films with a microplate-like shape as a ferroelectric pillar material, micropillar-type CoFe2O4 (CFO)/BNEuT(h00)/Nb:TiO2(101) composite multiferroic films were fabricated by metal organic chemical vapor deposition. The deposition time was varied from 90-150 min to examine its effect on the structural, ferroelectric, and ferromagnetic characteristics of the films. All the films exhibit single-phase cobalt ferrite with a cubic inverse-spinel structure. The deposited CFO films have a similar columnar structure with a comparatively good step coverage of 37%-66%. The room-temperature magnetization-magnetic field hysteresis loop of the films showed a clear ferromagnetic hysteresis loop, and coercivity decreased from 1.1 to 0.9 kOe with increasing the deposition time. The room-temperature polarization-electric field hysteresis loop of the films showed a ferroelectric hysteresis loop, and the effect of the leakage current was the smallest for a deposition time of 120 min.

MISC

 88

書籍等出版物

 3

共同研究・競争的資金等の研究課題

 20