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■京化■京都大学理学部化学科・京都大学大学院理学研究科学専攻
　

千葉 大地（准教授）

専門分野
スピントロニクス、磁性、半導体工学
研究テーマ
  1. スピントロニクスデバイスに関する研究
  2. 磁性の電界制御
  3. 電界誘起磁化スイッチングに関する研究
代表的な論文
  1. D. Chiba, M. Kawaguchi, S. Fukami, N. Ishiwata, K. Shimamura, K. Kobayashi, and T. Ono, Electric-field control of magnetic domain-wall velocity in ultrathin cobalt with perpendicular magnetization Nature Communications 3, 888, doi: 10.1038/ncomms1888(2012).
  2. M. Kawaguchi, K. Shimamura, S. Ono, S. Fukami, F. Matsukura, H. Ohno, D. Chiba, and T. Ono, Electric Field Effect on Magnetization of an Fe Ultrathin Film Applied Physics Express 5, 063007 (2012).
  3. 小山知弘, 千葉大地, 小野輝男, 垂直磁化Co/Ni細線における電流誘起磁壁移動 Jouurnal of Vaccume Society of Japan 55, 215-219 (2012).
  4. K. Tanabe, D. Chiba, J. Ohe, S. Kasai, H. Kohno, S. E. Barnes, S. Maekawa, K. Kobayashi, and T. Ono, Spin-motive force due to a gyrating magnetic vortex Nature Communications 3, 845, doi:10.1038/ncomms1824 (2012).
  5. K. Ueda, T. Koyama, R. Hiramatsu, D. Chiba, S. Fukami, H. Tanigawa, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, K. Kobayashi, and T. Ono, Temperature dependence of carrier spin polarization determined from current-induced domain wall motion in a Co/Ni nanowire Applied Physics Letters 100, 202407 (2012).
  6. Y. Yoshimura, T. Koyama, D. Chiba, Y. Nakatani, S. Fukami, M. Yamanouchi, H. Ohno, and T. Ono, Current-Induced Domain Wall Motion in Perpendicularly Magnetized Co/Ni Nanowire under In-Plane Magnetic Fields Applied Physics Express 5, 063001 (2012).
  7. T. Tanaka, T. Arakawa, K. Chida, Y. Nishihara, D. Chiba, K. Kobayashi, T. Ono, H. Sukegawa, S. Kasai, and S. Mitani, Signature of Coherent Transport in Epitaxial Spinel-Based Magnetic Tunnel Junctions Probed by Shot Noise Measurement Applied Physics Express 5, 053003 (2012).
  8. K. Shimamura, D. Chiba, S. Ono, S. Fukami, N. Ishiwata, M. Kawaguchi, K. Kobayashi, and T. Ono, Electrical control of Curie temperature in cobalt using an ionic liquid film Applied Physics Letters 100, 122402 (2012).
  9. S. Matsuo, T. Koyama, K. Shimamura, T. Arakawa, Y. Nishihara, D. Chiba, K. Kobayashi, T. Ono, C. Chang, K. He, X. Ma, and Q. Xue, Weak antilocalization and conductance fluctuation in a submicrometer-sized wire of epitaxial Bi2Se3 Phys. Rev. B 85, 075440 (2012).
  10. R. Hiramatsu, K. Kondou, T. Koyama, Y. Yoshimura, D. Chiba, S. Fukami, N. Ishiwata, and T. Ono, Effect of Current on Domain Wall Depinning Field in Co/Ni Nanowire Japanese Journal of Applied Physics 51, 028005 (2012).
  11. K. Kondou, N. Ohshima, D. Chiba, S. Kasai, K. Kobayashi, and T. Ono , Experimental detection of domain wall propagation above the Walker field Journal of Physics: Codenced Matter 24, 024217 (2012).
  12. K. Sekiguchi, K. Yamada, S. -M. Seo, K. -J. Lee, D. Chiba, K. Kobayashi, and T. Ono , Time-Domain Measurement of Current-Induced Spin Wave Dynamics Physical Review Letters 108, 017203 (2012).
  13. K. Nakano, D. Chiba, N. Ohshima, S. Kasai, T. Sato, Y. Nakatani, K. Sekiguchi, K. Kobayashi, and T. Ono, All-electrical operation of magnetic vortex core memory cell Applied Physics Letters 99, 262505 (2011).
  14. D. Chiba, S. Fukami, K. Shimamura, N. Ishiwata, K. Kobayashi and T. Ono, Electrical control of the ferromagnetic phase transition in cobalt at room temperature Nature Materials 10, 853-856 (2011).
  15. T. Koyama, D. Chiba, K. Ueda, H. Tanigawa, S. Fukami, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, and T. Ono, Wire Width Dependence of Threshold Current Density for Domain Wall Motion in Co/Ni Nanowires IEEE Transcations on Magnetics 47, 3089-3091 (2011).
  16. N Ohshima, T Koyama, H Tanigawa, M Kotsugi, T Ohkouchi, D Chiba, T Kinoshita and T Ono, Real space observation of current-induced magnetic domain wall displacement in Co/Ni nano-wire by photoemission electron microscopy Journal of Physics: Condensed Matter 23, 382202 (2011).
  17. K. Kondou, R. Hiramatsu, T. Koyama, Y. Nakatani, D. Chiba, S. Fukami, N. Ishiwata, and T. Ono, Electrical Investigation of Notch Width Dependence of Domain Wall Structure in Co/Ni Nanowires Japanese Journal of Applied Physics 50, 073002 (2011).
  18. K. Ueda, T. Koyama, D. Chiba, K. Shimamura, H. Tanigawa, S. Fukami, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, and T. Ono, Current-Induced Magnetic Domain Wall Motion in Co/Ni Nanowire at Low Temperature Applied Physics Express 4, 063003 (2011).
  19. T. Arakawa, K. Sekiguchi, S. Nakamura, K. Chida, Y. Nishihara, D. Chiba, K. Kobayashi, A. Fukushima, S. Yuasa, and T. Ono, Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions Applied Physics Letters 98, 202103 (2011).
  20. T. Koyama, D. Chiba, K. Ueda, H. Tanigawa, S. Fukami, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, and T. Ono, Magnetic field insensitivity of magnetic domain wall velocity induced by electrical current in Co/Ni nanowire Applied Physics Letters 98, 192509 (2011).
  21. T. Koyama, D. Chiba, K. Ueda, K. Kondou, H. Tanigawa, S. Fukami, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, K. Kobayashi, and T. Ono, Observation of the intrinsic pinning of a magnetic domain wall in a ferromagnetic nanowire Nature Materials 10, 194-197 (2011).
  22. K. Ueda, D. Chiba, T. Koyama, G. Yamada, H. Tanigawa S. Fukami, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, and T. Ono, Current-induced domain wall motion in Co/Ni nano-wires with different Co and Ni thicknesses Journal of Physics: Conference Series 266, 012110 (2011).
  23. D. Chiba, F. Matsukura, and H. Ohno, Electrically defined ferromagnetic nanodots Nano Letters 10, 4505–4508 (2010).
  24. 岡林潤、近藤剛、千葉大地、野崎隆行、清水大雅、川畑史郎、秋永広幸, 磁性・スピントロニクス 応用物理 79, 720-722 (2010).
  25. K. Sekiguchi, K. Yamada, S. M. Seo, K. J. Lee, D. Chiba, K. Kobayashi, and T. Ono, Nonreciprocal emission of spin-wave packet in FeNi film Applied Physics Letters 97, 022508 (2010).
  26. K. Tanabe, D. Chiba, and T. Ono , Electrical Detection of Magnetic Vortex Chirality Japanese Journal of Applied Physics 49, 078001 (2010).
  27. D. Chiba, G. Yamada, T. Koyama, K. Ueda, H. Tanigawa, S. Fukami, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, and T. Ono, Control of Multiple Magnetic Domain Walls by Current in a Co/Ni Nano-Wire Applied Physics Express 3, 073004 (2010).
  28. K. Sekiguchi, T. Arakawa, Y. Yamauchi, K. Chida, M. Yamada, H. Takahashi, D. Chiba, K. Kobayashi, and T. Ono, Observation of full shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions Applied Physics Letters 96, 252504 (2010).
  29. D. Chiba, Y. Nakatani, F. Matsukura, and H. Ohno, Simulation of magnetization switching by electric-field manipulation of magnetic anisotropy Applied Physics Letters 96, 192506 (2010).
  30. K. Nakano, D. Chiba, K. Sekiguchi, S. Kasai, N. Ohshima, K. Kobayashi, and T. Ono, Electrical Detection of Vortex Core Polarity in Ferromagnetic Disk Applied Physics Express 3, 053001 (2010).
  31. S. R. Dunsiger, J. P. Carlo, T. Goko, G. Nieuwenhuys, T. Prokscha, A. Suter, E. Morenzoni, D. Chiba, Y. Nishitani, T. Tanikawa, F. Matsukura, H. Ohno, J. Ohe, S. Maekawa, and Y. J. Uemura, Spatially homogeneous ferromagnetism of (Ga, Mn)As Nature Materials 9, 299-303 (2010).
  32. D. Chiba, A. Werpachowska, M. Endo, Y. Nishitani, F. Matsukura, T. Dietl, and H. Ohno, Anomalous Hall Effect in Field-Effect Structures of (Ga,Mn)As Physical Review Letters 104, 106601 (2010).
  33. Y. Nishitani, D. Chiba, M. Endo, M. Sawicki, F. Matsukura, T. Dietl, and H. Ohno, Curie temperature versus hole concentration in field-effect structures of Ga1−xMnxAs Physical Review B 81, 045208 (2010).
  34. M. Endo, D. Chiba, H. Shimotani, F. Matsukura, Y. Iwasa, and H. Ohno, Electric double layer transistor with a (Ga,Mn)As channel Applied Physics Letters 96, 022515 (2010).
  35. M. Sawicki, D. Chiba, A. Korbecka, Y. Nishitani, J. A. Majewski, F. Matsukura, T. Dietl, and H. Ohno, Experimental probing of the interplay between ferromagnetism and localization in (Ga,Mn)As Nature Physics 6, 22-25 (2010).
  36. 千葉大地，山ノ内路彦，松倉文礼, 大野英男, 強磁性半導体における磁壁の電流駆動 まぐね 4, 390-395 (2009).
  37. H. Tanigawa, T. Koyama, G. Yamada, D. Chiba, S. Kasai, S. Fukami, T. Suzuki, N. Ohshima1, N. Ishiwata1, Y. Nakatani, and T. Ono, Domain Wall Motion Induced by Electric Current in a Perpendicularly Magnetized Co/Ni Nano-Wire Applied Physics Express 2, 053002 (2009).
  38. Y. Nishitani, D. Chiba, F. Matsukura, and H. Ohno, ac susceptibility of (Ga,Mn)As probed by the anomalous Hall effect Journal of Applied Physics 105, 7C516 (2009).
  39. A. Tsukazaki, A. Ohtomo, D. Chiba, Y. Ohno, H. Ohno, and M. Kawasaki, Low-temperature field-effect and magnetotransport properties in a ZnO based heterostructure with atomic-layer-deposited gate dielectric Applied Physics Letters 93, 241905 (2008).
  40. F. Matsukura, D. Chiba, and H. Ohno, Spintronic Properties of Ferromagnetic Semiconductors Semiconductors and semimetals (SPINTRONICS) 82, 207-240 (2008).
  41. D. Chiba, M. Sawicki, Y. Nishitani, Y. Nakatani, F. Matsukura, and H. Ohno, Magnetization vector manipulation by electric fields Nature 455, 515-518 (2008).
  42. Yong Pu, Daichi Chiba, Fumihiro Matsukura, Hideo Ohno, and Jing Shi, Mott relation for anomalous Hall and Nernst effects in Ga1-xMnxAs ferromagnetic semiconductors Physical Review Letters 101, 117208 (2008).
  43. C. Gould, S. Mark, K. Pappert, R. G. Dengel, J. Wenisch, R. P. Campion , A. W. Rushforth, D. Chiba, Z. Li, X. Liu, W. Van Roy, H. Ohno, J. K. Furdyna, B. Gallagher, K. Brunner, G. Schmidt, and L. W. Molenkamp, An extensive comparison of anisotropies in MBE grown (Ga, Mn)As material New Journal of Physics 10, 55007 (2008).
  44. T. Kita, D. Chiba, Y. Ohno, and H. Ohno, Fabrication of a few-electron In0.56Ga0.44As vertical quantum dot with an Al2O3 gate insulator Physica E 40, 1930-1932 (2008).
  45. Y. Nishitani, D. Chiba, F. Matsukura, and H. Ohno, Electrical Curie temperature modulation in (Ga, Mn)As field-effect transistors with Mn composition from 0.027 to 0.2 Journal of Applied Physics 103, 07D139 (2008).
  46. D. Chiba, K. M. Yu, W. Walukiewicz, Y. Nishitani, F. Matsukura, and H. Ohno, Properties of Ga1-xMnxAs with high x (>0.1) Jpurnal of Applied Physics 103, 07D136 (2008).
  47. D. Chiba, Y. Nishitani, F. Matsukura, and H. Ohno, Properties of Ga1-xMnxAs with high Mn composition (x>0.1) Applied Physics Letters 90, 122503 (2007).
  48. T. Kita, D. Chiba, Y. Ohno, and H. Ohno, A few-electron vertical In0.56Ga0.44As quantum dot with an insulating gate Applied Physics Letters 91, 232101 (2007).
  49. M. Endo, D. Chiba, Y. Nishitani, F. Matsukura, and H. Ohno, Channel thickness dependence of the magnetic properties in (Ga, Mn)As FET structures Journal of Superconductivity and Novel Magnetism 20, 409 (2007).
  50. D. Chiba, M. Yamanouchi, F. Matsukura, T. Dietl, and H. Ohno, Domain wall resistance in perpendicularly magnetized (Ga, Mn)As Journal of Magnetism and Magnetic Materials 310, 2078 (2007).
  51. T. Kita, D. Chiba, Y. Ohno, and H. Ohno, (In, Ga)As gated-vertical quantum dot with an Al2O3 insulator Applied Physics Letters 90, 62102 (2007).
  52. H. -J. Lee, D. Chiba, F. Matsukura, and H. Ohno, Effect of substrate temperature on the properties of heavily Mn-doped GaAs Journal of Crystal Growth 301-302, 264 (2007).
  53. T. Yamada, D. Chiba, F. Matsukura, S. Yakata, and H. Ohno, Magnetic anisotropy in (Ga, Mn)As probed by magnetotransport measurements Physica Status Solidi (c) 3, 4086 (2007).
  54. 千葉大地, 山ノ内路彦, 松倉文礼, T. Dietl, 大野英男, 強磁性半導体における磁壁と伝導 固体物理 42, 99 (2007).
  55. D. Chiba, F. Matsukura, and H. Ohno, Electric-field control of ferromagnetism in (Ga,Mn)As Applied Physics Letters 89, 162505 (2006).
  56. D. Chiba, F. Matsukura, and H. Ohno, Electrical magnetization reversal in ferromagnetic III-V semiconductors Journal of Physics D: Applied Physics 39, R215 (2006).
  57. M. Yamanouchi, D. Chiba, F. Matsukura, and H. Ohno, Current-assisted domain wall motion in ferromagnetic semiconductors Japanese Journal of Applied Physics 45, 3854 (2006).
  58. D. Chiba, T. Kita, F. Matsukura, and H. Ohno, Pulse-width and magnetic-field dependences of current-induced magnetization switching in a (Ga, Mn)As magnetic tunnel junction Journal of Applied Physics 99, 08G514 (2006).
  59. D. Chiba, M. Yamanouchi, F. Matsukura, T. Dietl, and H. Ohno, Domain-wall resistance in ferromagnetic (Ga, Mn)As Physical Review Letters 96, 96602 (2006).
  60. M. Yamanouchi, D. Chiba, F. Matsukura, T. Dietl, and H. Ohno, Velocity of domain-wall motion induced by electrical current in the ferromagnetic semiconductor (Ga, Mn)As Physical Review Letters 96, 96601 (2006).
  61. Y. Sato, D. Chiba, F. Matsukura, and H. Ohno, Effect of GaAs intermediary layer thickness on the properties of (Ga,Mn)As tri-layer structures Journal of Superconductivity: Incorporating Novel Magnetism 18, 345 (2005).
  62. 千葉大地, 松倉文礼, 大野英男, 強磁性半導体トンネル接合におけるスピン注入磁化反転 日本応用磁気学会誌 29, 514 (2005).
  63. D. Chiba, Y. Sato, T. Kita, F. Matsukura, and H. Ohno, Current-driven magnetization reversal in a ferromagnetic semiconductor (Ga,Mn)As/GaAs/(Ga,Mn)As tunnel junction Physical Review Letters 93, 216602 (2004).
  64. D. Chiba, M. Yamanouchi, F. Matsukura, and H. Ohno, Control of magnetization reversal in ferromagnetic semiconductors by electrical means Journal of Physics: Condensed Matter 16, S5693 (2004).
  65. M. Yamanouchi, D. Chiba, F. Matsukura, and H. Ohno, Current-induced domain-wall switching in a ferromagnetic semiconductor structure Nature 428, 539 (2004).
  66. F. Matsukura, M. Sawicki, T. Dietl, D. Chiba and H.Ohno, Magnetotransport properties of metallic (Ga, Mn)As films with compressive and tensile strain Physica E 21, 1032 (2004).
  67. D. Chiba, F. Matsukura, H. Ohno, Tunneling magnetoresistance in (Ga, Mn)As-based heterostructures with a GaAs barrier Physica E 21, 966 (2004).
  68. J. H. Zhao, F. Matsukura, K. Takamura, D. Chiba, Y. Ohno, K. Ohtani, H. Ohno, Zincblende CrSb/GaAs multilayer structures with room-temperature ferromagnetism Materials Science in Semiconductor Processing 6, 507 (2003).
  69. 千葉大地, 山ノ内路彦, 松倉文礼, 大野英男, 強磁性の電界制御 固体物理 38, 612 (2003).
  70. D. Chiba, M. Yamanouch, F. Matsukura and H. Ohno, Electrical manipulation of magnetization reversal in a ferromagnetic semiconductor Science 301, 943 (2003).
  71. D. Chiba, K. Takamura, F. Matsukura and H.Ohno, Effect of low-temperature annealing on (Ga, Mn)As trilayer structures Applied Physics Letters 82, 3020 (2003).
  72. D. Chiba, M. Yamanouchi, F. Matsukura, E. Abe, Y. Ohno, K. Ohtani, H. Ohno, Electric field effect on the magnetic properties of III-V ferromagnetic semiconductor (In, Mn)As and (Al, Ga, Mn)As Journal of Superconductivity 16, 179 (2003).
  73. F. Matsukura, D. Chiba, Y. Ohno, T. Dietl, H. Ohno, Spin degree of freedom in ferromagnetic semiconductor heterostructures Physica E 16, 104 (2003).
  74. K. Takamura, F. Matsukura, D. Chiba, and H. Ohno, Magnetic properties of (Al, Ga, Mn)As Applied Physics Letters 81, 2590 (2002).
  75. J.H. Zhao, F. Matsukura, E. Abe, D. Chiba, Y. Ohno, K. Takamura, and H. Ohno, Growth and properties of (Ga, Mn)As on Si (100) substrate Journal of Crystal Growth 237-239, 1349 (2002).
  76. F. Matsukura, D. Chiba, T. Omiya, E. Abe, T. Dietl, Y. Ohno, K. Ohtani, and H. Ohno, Control of ferromagnetism in field-effect transistor of a magnetic semiconductor Physica E 12, 351 (2002).
  77. 千葉大地, 松倉文礼, 大野英男, キャリア誘起強磁性の電界制御 工業材料 49, 56 (2001).
  78. J. H. Zhao, F. Matsukura, K. Takamura, E. Abe, D. Chiba, and H. Ohno, Room-temperature ferromagnetism in zincblende CrSb grown by molecular beam epitaxy Applied Physics Letters 79, 2776 (2001).
  79. D. Chiba, N. Akiba, F. Matsukura, Y. Ohno, and H. Ohno, Properties of (Ga,Mn)As/(Al,Ga)As/(Ga,Mn)As magnetic trilayer structures Physica E 10, 278 (2001).
  80. H. Ohno, D. Chiba, F. Matsukura, T. Omiya, E. Abe, T. Dietl, Y. Ohno, and K. Ohtani, Electric-field control of ferromagnetism Nature 408, 944 (2000).
  81. D. Chiba, N. Akiba, F. Matsukura, Y. Ohno, and H. Ohno, Magnetoresistance effect and interlayer coupling of (Ga, Mn)As trilayer structures Applied Physics Letters 77, 1873 (2000).
  82. N. Akiba, D. Chiba, K. Nakata, F. Matsukura, Y. Ohno, and H. Ohno, Spin-dependent scattering in semiconducting ferromagnetic (Ga,Mn)As trilayer structures Journal of Applied Physics 87, 6436 (2000).
略歴・受賞
学歴
2000.3 東北大学工学部卒
2001.9 東北大学工学研究科博士前期課程修了
2004.3 東北大学工学研究科博士後期課程修了
2004.3 博士(工学)の学位取得(東北大学)
職歴
2004.4 独立行政法人科学技術振興機構　ERATO大野半導体スピントロニクスプロジェクト　研究員
2008.10 京都大学化学研究所特定助教
2009.4 京都大学化学研究所助教
2012.4 京都大学化学研究所准教授(現在)
受賞
2001. 9 (社)応用物理学会第10回応用物理学会講演奨励賞
2003.12 (財)青葉工学振興会 第9回研究奨励賞
2009.11 第4回凝縮系科学賞
2011.6 第24回安藤博記念学術奨励賞
2012.6 第33回本多記念研究奨励賞
連絡先
部屋番号　化学研究所　C2008
電話番号　0774-38-4730
電子メール　dchiba　+at-mark+　scl.kyoto-u.ac.jp
リンク
ナノスピントロニクス分科紹介（京化サイト内）
小野研究室のホームページ
千葉大地の研究者情報

（最終更新日；2018年04月05日）
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