Menbers

Personal History

Dr. Akihito Sawa

Curriculum Vitae

March 1989
B.E., University of Tsukuba
　　　　　　　　　　　　　　　　　　　　　　　　　　　　
March 1991
M.E., University of Tsukuba
　　　　　　　　　　　　　　　　　　　　　　　　　　　　
April 1991
Research Scientist
Electrotechnical Laboratory (ETL)
　　　　　　　　　　　　　　　　　　　　　　　　　　　　
February 2001
Ph.D, University of Tsukuba
　　　　　　　　　　　　　　　　　　　　　　　　　　　　
April 2001
Senior Research Scientist
Correlated Electron Research Center (CERC)
National Insititute of Advanced Industrial Science and Technology (AIST)
　　　　　　　　　　　　　　　　　　　　　　　　　　　　
June 2002
　　　　　　　　　　　　　　　　　　　　　　　　　　　　
- March 2003
Guest Researcher, University of Augsburg
　　　　　　　　　　　　　　　　　　　　　　　　　　　　
April 2008
Leader, Correlated Electron Heterointerfaces Group
Nanoelectronics Research Institute
National Insititute of Advanced Industrial Science and Technology (AIST)
April 2011
Leader, Correlated Electronics Group
Electronics and Photonics Research Institute
& Director, Research Core for Correlated Electrons
National Insititute of Advanced Industrial Science and Technology (AIST)
April 2015
Deputy Director, Electronics and Photonics Research Institute
& Leader, Correlated Electronics Group
National Insititute of Advanced Industrial Science and Technology (AIST)

Research Area

Oxide Electronics, ReRAM

Research Achievements

-Demonstrations of interfacial resistive switching for perovskite-type transition metal oxides
-Evaluation of Fermi-level shift with band filling in perovskite-type transition metal oxides by using heteroepitaxial Schottky/p-n junctions

Publications

  1. K, Shibuya, Y. Atsumi, T. Yoshida, Y. Sakakibara, M. Mori, and A. Sawa, “Silicon waveguide optical modulator driven by metal-insulator transition of vanadium dioxide cladding layer”, Optics Express 27, 4147 (2019).
  2. Y. Uemura, S. Arai, J. Tsutsumi, S. Matsuoka, H. Yamada, R. Kumai, S. Horiuchi, A. Sawa, and T. Hasegawa, “Field-Modulation Imaging of Ferroelectric Domains in Molecular Single-Crystal Films”, Physical Review Applied 11, 014046 (2019).
  3. T. Miyamoto, Y. Matsui, T. Terashige, T. Morimoto, N. Sono, H. Yada, S. Ishihara, Y. Watanabe, S. Adachi, T. Ito, K. Oka, A. Sawa, and H. Okamoto, “Probing ultrafast spin-relaxation and precession dynamics in a cuprate Mott insulator with seven-femtosecond optical pulses”, Nature Communications 9, 3848 (2018).
  4. H. Yamada, Y. Toyosaki, and A. Sawa, “Growth and ferroelectric properties of yttrium-doped hafnium oxide/indium-tin oxide polycrystalline heterostructures with sharp and uniform interfaces”, Journal of Applied Physics 124, 105305 (2018).
  5. Y. Tomioka, T. Ito, and A. Sawa, “Magnetotransport Properties of Eu1-xLaxTiO3 (0 < x < 0.07) Single Crystals”, Journal of the Physical Society of Japan 87, 094716 (2018).
  6. Y. Tomioka, T. Ito, and A. Sawa, “Electronic phase diagram of half-doped perovskite manganites on the plane of quenched disorder versus one-electron bandwidth”, Physical Review 97, 014409 (2018).
  7. K. Shibuya and A. Sawa,“Raman scattering of epitaxial vanadium dioxide films with low-temperature monoclinic phase”, Journal of Applied Physics 122, 015307 (2017).
  8. Y. Matsui, T. Terashige, R. Uchida, T. Miyamoto, H. Yada, H. Matsuzaki, B. -S. Li, A. Sawa, and H. Okamoto, “Intrinsic carrier scattering mechanism in anatase TiO2 investigated by ultraviolet-pump terahertz-probe spectroscopy”, Physical Review B 94, 041113(R) (2016).
  9. K. Miyazaki, K. Shibuya,　M. Suzuki, K. Sakai, J. Fujita, and A. Sawa, “Chromium-niobium co-doped vanadium dioxide films: large temperature coefficient of resistance and practically no thermal hysteresis of the metal-insulator transition”, AIP Advances 6, 055012 (2016).
  10. H. Yamada, Y. Toyosaki, and A. Sawa, “Coherent Epitaxy of a Ferroelectric Heterostructure on a Trilayered Buffer for Integration into Silicon”, Advanced Electronic Materials 2, 201500334 (2016).
  11. K. Shibuya and A. Sawa, “Modulation of Metal-Insulator Transition in VO2 by Electrolyte Gating-Induced Protonation”, Advanced Electronic Materials 2, 1500131 (2016).
  12. H. Nakao, T. Sudayama, M. Kubota, J. Okamoto, Y. Yamasaki, Y. Murakami, H. Yamada, A. Sawa, and K. Iwasa, “Magnetic and electronic states in (LaMnO3)2(SrMnO3)2 superlattice exhibiting a large negative magnetoresistance”, Physical Review B 92, 245104 (2015).
  13. L. Liu, A. Tsurumaki-Fukuchi, H. Yamada, and A. Sawa, “Ca doping dependence of resistive switching characteristics in ferroelectric capacitors comprising Ca-doped BiFeO3”, Journal of Applied Physics 118, 204014 (2015).
  14. K. Shibuya and A. Sawa, “Optimization of conditions for growth of vanadium dioxide thin films on silicon by pulsed-laser deposition”, AIP Advances 5, 107118 (2015).
  15. K. Miyazaki, K. Shibuya,　M. Suzuki, H. Wado, and A. Sawa, “High temperature coefficient of resistance of low-temperature-grown VO2 films on TiO2-buffered SiO2/Si (100) substrates”, Journal of Applied Physics 118, 055301 (2015).
  16. H. Yamada, A. Tsurumaki-Fukuchi, M. Kobayashi, T. Nagai, Y. Toyosaki, H. Kumigashira, and A. Sawa, “Strong Surface-Termination Effect on Electroresistance in Ferroelectric Tunnel Junctions”, Advanced Functional Materials 25, 2708 (2015).
  17. H. Matsuzaki, H. Nishioka, H. Uemura, A. Sawa, S. Sota, T. Tohyama, and H. Okamoto, “Ultrafast charge and lattice dynamics in one-dimensional Mott insulator of CuO-chain compound Ca2CuO3 investigated by femtosecond absorption spectroscopy”, Physical Review B 91, 081114(R) (2015).
  18. Y. Tomioka, T. Ito, and A. Sawa, “Evolutions of metallic ferromagnetism and magnetotransport properties of La1-xBaxMnO3 single crystals with 0 < x < 0.5”, Journal of the Physical Society of Japan 84, 024703 (2015).
  19. E. Miranda, D. Jimenez, A. Tsurumaki-Fukuchi, J. Blasco, H. Yamada, J. Sune, and A. Sawa, “Modeling of hysteretic Schottky diode-like conduction in Pt/BiFeO3/SrRuO3 switches”, Applied Physics Letters, 105, 082904 (2014).
  20. G. Shibata, K. Yoshimatsu, E. Sakai, V. R. Singh, V. K. Verma, K. Ishigami, T. Harano, T. Kadono, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, A. Sawa, H. Kumigashira, M. Oshima, T. Koide, and A. Fujimori, “Thickness-dependent ferromagnetic metal-to-paramagnetic insulator transition in La0.6Sr0.4MnO3 thin films studied by x-ray magnetic circular dichroism”, Physical Review B 89, 235123 (2014).
  21. K. Miyazaki, K. Shibuya, M. Suzuki, H. Wado, and A. Sawa, “Correlation between thermal hysteresis width and broadening of metal-insulator transition in Cr and Nb doped VO2 films”, Japanese Journal of Applied Physics 53, 235123 (2014).
  22. A. Tsurumaki-Fukuchi, H. Yamada, and A. Sawa, “Resistive switching characteristics in dielectric/ferroelectric composite devices improved by post-thermal annealing at relatively low temperature”, Applied Physics Letters, 104, 092903 (2014).
  23. H. Nakao, H. Yamada, A. Sawa, K. Iwasa, J. Okamoto, T. Sudayama, Y. Yamasaki, and Y. Murakami, “Neutron magnetic scattering study in manganite thin film system”, Solid State Communications 185, 18-20 (2014).
  24. H. Matsuzaki, Y. Matsui, R. Uchida, H. Yada, T. Terashige, B.-S. Li, A. Sawa, M. Kawasaki, Y. Tokura, and H. Okamoto, “Photocarrier dynamics in anatase TiO2 investigated by pump-probe absorption spectroscopy”, Journal of Applied Physics 115, 053514 (2014).
  25. D. Jimenez, E. Miranda, A. Tsurumaki-Fukuchi, H. Yamada, J. Sune, and A. Sawa, “Multilevel recording in Bi-deficient Pt/BFO/SRO heterostructures based on ferroelectric resistive switching targeting high-density information storage in nonvolatile memories”, Applied Physics Letters 103, 263502 (2013).
  26. T. Harano, G. Shibata, K. Yoshimatsu, K. Ishigami, V.K.Verma, Y. Takahashi, T. Kadono, T. Yoshida, A. Fujimori, T. Koide, F.-H. Chang, H.-J. Lin, D.-J. Huang, C.-T. Chen, P.-H. Xiang, H. Yamada, and A. Sawa, “Phase diagram of Ca1-xCexMnO3 thin films studied by x-ray magnetic circular dichroism”, Solid State Communications 174, 30 (2013).
  27. A. Tsurumaki-Fukuchi, H. Yamada, and A. Sawa, “Resistive switching artificially induced in a dielectric/ferroelectric composite diode”, Applied Physics Letters, 103, 152903 (2013).
  28. K. Shibuya, J. Tsutsumi, T. Hasegawa, and A. Sawa, “Fabrication and Raman scattering study of epitaxial VO2 films on MgF2 (001) substrates”, Applied Physics Letters 103, 021604 (2013).
  29. T. Harano, G. Shibata, K. Ishigami, Y. Takashashi, V. K. Verma, V. R. Singh, T. Kadono, A. Fujimori1, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, T. Koide, H. Yamada, A. Sawa, M. Kawasaki, Y. Tokura, and A. Tanaka, “Role of doped Ru in coercivity-enhanced La0.6Sr0.4MnO3 thin film studied by x-ray magnetic circular dichroism”, Applied Physics Letters 102, 222404 (2013).
  30. P.-H. Xiang, S. Asanuma, H. Yamada, H. Sato, I. H. Inoue, H. Akoh, A. Sawa, M. Kawasaki, and Y. Iwasa, “Electrolyte-Gated SmCoO3 Thin-Film Transistors Exhibiting Thickness-Dependent Large Switching Ratio at Room Temperature”, Advanced Materials 25, 2158 (2013).
  31. B.-S. Li, A. Sawa, and H. Okamoto, “Fermi level shift in La2-xSrxCuO4 probed by heteroepitaxial junctions with Nb-doped SrTiO3”, Applied Physics Letters 102,111606 (2013).
  32. P.-H. Xiang, H. Yamada, H. Akoh, and A. Sawa, “Phase diagrams of strained Ca1-xCexMnO3 films”, Journal of Applied Physics 112, 113703 (2012).
  33. A. Tsurumaki, H. Yamada, and A. Sawa, “Impact of Bi Deficiencies on Ferroelectric Resistive Switching Characteristics Observed at p-Type Schottky-Like Pt/Bi1-δFeO3 Interfaces”, Advanced Functional Materials 22, 1040 (2012).
  34. P.-H. Xiang, S. Asanuma, H. Yamada, I. H. Inoue, H. Sato, H. Akoh, A. Sawa, K. Ueno, H. Yuan, H. Shimotani, M. Kawasaki, and Y. Iwasa, “Strain-Mediated Phase Control and Electrolyte-Gating of Electron-Doped Manganites”, Advanced Materials 23, 5822 (2011).
  35. B.-S. Li, A. Sawa, and Hiroshi Okamoto, “Suppression of Precipitates in the La2-xSrxCuO4 Films Grown on LaSrAlO4 Substrates by Introducing Homoepitaxial Layer”, Japanese Journal of Applied Physics 50, 093101 (2011).
  36. H. Yada, M. Matsubara, H. Matsuzaki, H. Yamada, A. Sawa, and H. Okamoto,“Discrimination between photodoping- and heat-induced magnetization changes in Nd0.52Sr0.48MnO3 using a heterostructure with SrTiO3”, Physical Review B 84, 045114 (2011).
  37. H. Yada, M. Matsubara, H. Yamada, A. Sawa, H. Matsuzaki, and H. Okamoto,“Ultrafast control of magnetization by photocarrier injection in La0.9Sr0.1MnO3/SrTiO3 heterostructures”, Physical Review B 83, 165408 (2011).
  38. H. Okamoto, T. Miyagoe, K. Kobayashi, H. Uemura, H. Nishioka, H. Matsuzaki, A. Sawa, and Y. Tokura, “Photoinduced transition from Mott insulator to metal in the undoped cuprates Nd2CuO4 and La2CuO4”, Physical Review B 83, 125102 (2011).
  39. M. Nakamura, A. Sawa, J. Fujioka, M. Kawasaki, and Y. Tokura, “Interface band profiles of Mott-insulator/Nb:SrTiO3 heterojunctions as investigated by optical spectroscopy”, Physical Review B 82, 201101(R) (2010).
  40. S. Asanuma, P.-H. Xiang, H. Yamada, H. Sato, I. H. Inoue, H. Akoh, A. Sawa, K. Ueno, H. Shimotani, H. Yuan, M. Kawasaki, and Y. Iwasa, “Tuning of the metal-insulator transition in electrolyte-gated NdNiO3 thin films”, Applied Physics Letters 97, 142110 (2010).
  41. H. Okamoto, T. Miyagoe, K. Kobayashi, H. Uemura, H. Nishioka, H. Matsuzaki, A. Sawa, and Y. Tokura, “Ultrafast charge dynamics in photoexcited Nd2CuO4 and La2CuO4 cuprate compounds investigated by femtosecond absorption spectroscopy”, Physical Review B 82, 060513(R) (2010).
  42. P.-H. Xiang, S. Asanuma, H. Yamada, I. H. Inoue, H. Akoh and A. Sawa, “Room temperature Mott metal-insulator transition and its systematic control in Sm1-xCaxNiO3 thin film”, Applied Physics Letters 97, 032114 (2010).
  43. M. Konoto, A. Fukushima, R. Matsumoto, H. Kubota, K. Yakushiji, A. Sawa, S. Yuasa, K. Ando, “Direct imaging of local spin orientation within artificial nanomagnets”, Applied Physics Express 3, 063001 (2010).
  44. P.-H. Xiang, H. Yamada, A. Sawa, and H. Akoh, “Colossal magnetoresistance accompanied with magnetorelaxor behavior in phase-separated Ca1-xCexMnO3 thin films and CaMnO3/Ca0.92Ce0.08MnO3 superlattices”, Journal of Applied Physics, 107, 063717 (2010).
  45. H. Yamada, P.-H. Xiang, and A. Sawa, “Phase evolution and critical behavior in strain-tuned LaMnO3-SrMnO3 superlattices”, Physical Review B 81, 014410 (2010).
  46. S. Asanuma, H. Akoh, H. Yamada, and A. Sawa, “Relationship between resistive switching characteristics and band diagrams of Ti/Pr1-xCaxMnO3 junctions”, Physical Review B 80, 235113 (2009).
  47. P. -H. Xiang, H. Yamada, A. Sawa, and H. Akoh, “Strain-controlled electronic properties and magnetorelaxor behaviors in electron-doped CaMnO3 thin films”, Applied Physics Letters, 94, 062109 (2009).
  48. A. Sawa,“Resistive switching in transition-metal oxides”, Materials Today, 11, 6, 28-36 (2008).
    49. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　
  49. J. Matsuno, A. Sawa, M. Kawasaki, and Y. Tokura,“Magnetic-field tuning of interface electronic properties in manganite-titanate junctions”, Applied Physics Letters, 92, 122104-1-3 (2008).
    50. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　
  50. A. Sawa, A. Yamamoto, H. Yamada, T. Fujii, M. Kawasaki, J. Matsuno, and Y. Tokura, “Fermi level shift in La1-xSrxMO3 (M = Mn, Fe, Co, and Ni) probed by Schottky-like heteroepitaxial junctions with SrTi0.99Nb0.01O3”, Applied Physics Letters 90, 252102-1-3 (2007).
    51. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　
  51. T. Fujii, M. Kawasaki, A. Sawa, Y. Kawazoe, H. Akoh, M. Kawasaki, and Y. Tokura,“Electrical properties and colossal electro-resistance of heteroepitaxial SrRuO3/SrTi1-xNbxO3 (0.0002 < x < 0.02) Schottky junctions”, Physical Review B 75, 165101-1-7 (2007).
    52. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　
  52. M. Nakamura, A. Sawa, H. Sato, H Akoh, M. Kawasaki, and Y. Tokura,“Optical probe of electrostatic doping in an n-type Mott insulator”, Physical Review B 75, 155103-1-5 (2007).
    53. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　
  53. A. Yamamoto, A. Sawa, H. Akoh, M. Kawasaki, and Y. Tokura,“Electrical properties of oxide heteroepitaxial p-n junctions: La1-xSrxFeO3/SrTi0.99Nb0.01O3”, Applied Physics Letters 90, 112104-1-3 (2007).
    54. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　
  54. A. Sawa, T. Fujii. M. Kawasaki, and Y. Tokura, “Interface resistance switching at a few nanometers thick perovskite manganite active layers”, Applied Physics Letters 88, 232112-1-3 (2006).
  55. Y. Tokunaga, Y. Kaneko, J.P. He, T.Arima, A. Sawa, T. Fujii. M. Kawasaki, and Y. Tokura, “Colossal electro-resistance effect at metal electrode/La1-xSr1+xMnO4 interfaces”, Applied Physics Letters 88, 223507-1-3 (2006).
  56. A. Sawa, T. Fujii. M. Kawasaki, and Y. Tokura, “Colossal electro-resistance memory effect at metal/La2CuO4 interfaces”, Japanese Journal of Applied Physics 44, L1241-1243 (2005).
  57. A. Sawa, T. Fujii. M. Kawasaki, and Y. Tokura, “Highly rectifying Pr0.7Ca0.3MnO3/SrTi0.9998Nb0.0002O3 p-n junction”, Applied Physics Letters 86, 112508-1-3 (2005).
  58. T. Fujii, M. Kawasaki, A. Sawa, H. Akoh, Y. Kawazoe, and Y. Tokura, “Hysteretic current-voltage characteristics and resistance switching at an epitaxial Schottky junction SrRuO3/SrTi0.99Nb0.01O3”, Applied Physics Letters 86, 012107-1-3 (2005).
  59. A. Sawa, T. Fujii. M. Kawasaki, and Y. Tokura, “Hysteretic current-voltage characteristics and resistance switching at a rectifying Ti/Pr0.7Ca0.3MnO3 interface”, Applied Physics Letters 85, 4073-4075 (2004).
  60. Y. Ishii, H. Sato, A. Sawa. H. Akoh, M. Kawasaki, and Y. Tokura, “Precipitate-free films of La1-xSrxMnO3 grown on the substrates with artificial step edges”, Applied Physics Letters 85, 3800-3802 (2004).
  61. A. Maeda, M. Ono, H. Kishida, T. Manako, A.Sawa, M. Kawasaki, Y. Tokura, and H. Okamoto, “Third- order nonlinear susceptibility spectra of CuO chain compounds investigated by Z-scan method”, Physical Review. B 70, 125117 (2004).
  62. H. Kashiwaya, S. Kashiwaya, B. Prijamboedi, A. Sawa, I. Kurosawa, Y. Tanaka, and I. Iguchi, “Anomalous magnetic-field tunneling of YBa2Cu3O7-δ junctions: Possible detection of non-Fermi-liquid states”, Physical Review. B 70, 094501 (2004).
  63. A. Sawa, C.W. Schneider, and J. Mannhart, “Unusual current-voltage characteristics of single crystalline and bicrystralline La0.7Ca0.3MnO3 films”, Annalen der Physik 13, 595-599 (2004).
  64. G. Yu. Logvenov, A.Sawa, C. W. Schneider, and J. Mannhart, “Influence of the doping concentration of Y1-yCayBa2Cu3O7-δ drain-source channels on the properties of superconducting field-effect devices”, Applied Physics Letters 83, 3428 (2003).
  65. H.Kishida, M. Ono, A. Sawa, M. Kawasaki, Y. Tokura, and H. Okamoto, “Third-order nonlinear optical spectroscopy in two-dimensional cuprates, Nd2CuO4 and La2CuO4”, Physical Review B 68, 075101 (2003).
  66. H. Kashiwaya, I. Kurosawa, S. Kashiwaya, A. Sawa, and Y. Tanaka, “Observation of phase-coherent transport in d-wave junctions”, Physical Review B 68, 054527 (2003).
  67. Y. Ogimoto, M. Izumi, A. Sawa, T. Manako, H. Sato, H. Akoh, M. Kawasaki, and Y. Tokura, “Tunneling magnetoresistance above room temperature in La0.7Sr0.3MnO3/SrTiO3/La0.7Sr0.3MnO3 junctions”, Japanese Journal of Applied Physics 42, L369 (2003).
  68. K.S. Takahashi, A. Sawa, Y. Ishii, H. Akoh, M. Kawasaki, and Y. Tokura, “Inverse tunnel magnetoresistance in all-perovskite junctions of La0.7Sr0.3Mn03/SrTiO3/SrRuO3”, Physical Review B 67, 094413 (2003).
  69. M. Murygensan, H. Obara, A. Sawa, S. Kosaka, Y. Nakagawa, J.C. Nie, and H. Yamasaki, “Microwave surface resistance of under doped Co substituted YBCO films”, Physica C 400, 65 (2003).
  70. A. Sawa, M. Kawasaki, H. Takagi, and Y. Tokura, “Electron doped superconductor La2-xCexCuO4: Preparation of thin films and modified doping-range for superconductivity”, Physical Review B 66, 014531 (2002).
  71. T. Yanagisaawa, S. Koikegami, H. Shibata, S. Kimura, S. Kashiwaya, A. Sawa, N. Matsubara, and K. Takita, “Anisotropic Optical Conductivity of Nd2-xCexCuO4 thin films”, Journal of Physical Society of Japan 70, 2833-2835 (2001).
  72. K.D. Develos, H. Yamasaki, A. Sawa, and Y. Nakagawa, “On the origin of surface outgrowths in pulsed-laser-deposited YBCO/CeO2/Al2O3 thin films”, Physica C 36, 121-129 (2001).
  73. H. Obara, A. Sawa, H. Yamasaki, and S. Kosaka, “Microwave surface resistance of YBa2Cu3Oy films covered by overdoped Y1-xCaxBa2Cu3Oy layers”, Applied Physics Letters 78, 646-648 (2001).
  74. A. Rastogi, H. Yamasaki, and A. Sawa, “Hysteretic magnetization in micron-thick YBa2Cu3O7-δ films in nearly parallel magnetic fields”, Physical Review B 62, 14452-14460 (2000).
  75. A. Sawa, S. Kashiwaya, H. Obara, H. Yamasaki, M. Koyanagi, N. Yoshida, and Y. Tanaka, “Spin-polarized tunneling of La0.67Sr0.33MnO3/YBa2Cu3O7-δ junctions”, Physica C 339, 287-297 (2000).
  76. T. Nagaoka, Y. Matsuda, H. Obara, A. Sawa, T. Terashima, I. Chong, M. Takano, “Hall anomaly in the superconducting state of high-Tc cuprates: universality in doping dependence”, M. Suzuki, Physical Review Letters 80, 3594-3597 (1998).
  77. A, Sawa, H. Yamasaki, Y. Mawatari, H. Obara, M. Umeda, and S. Kosaka, “Thickness dependence of the vortex-glass transition and critical scaling of current-voltage characteristics in YBa2Cu3O7-δ thin films”, Physical Review B 58, 2868-2877 (1998).
  78. Y. Mawatari, A. Sawa, H. Obara, M. Umeda, and H. Yamasaki, “Field-sweep rate dependence of magnetization and current-voltage characteristicsin superconducting disks”, Applied Physics Letters 70, 2300-2302 (1997).
  79. Y. Mawatari, A. Sawa, and H. Obara, “Critical state of YBa2Cu3Oy disc in perpendicular fields”, Physica C 258, 121-128 (1996).
  80. M. Hase, N. koide, K. Manabe, Y. Sasago, K. Uchinokura, and A. Sawa, “Antiferromagnetic long-range order caused by nonmagnetic impurities; magnetization of single-crystal Cu1-xZnxGeO3”, Physica B 215, 164-170 (1995).
  81. A. Sawa, H. Obara, and S. Kosaka, “Preparation of epitaxial YBa2Cu3O7-x/PrGaO3 layered structures by means of a molecularbeam epitaxy”, Physica C 221, 237-242 (1994).
  82. H. Obara, A. Sawa, and S. Kosaka, “Magnetization properties and irreversibility lines of YBCO/PBCO multilayered films”, Physical Review B 49, 1224-1232 (1994).
  83. A. Sawa, H. Obara, and S. Kosaka, “Effect of using pure ozone on in situ molecular beam epitaxy of YBa2Cu3O7-x thin films at low pressure”, Applied Physics Letters 64, 649-651 (1994).

Books

  1. “Interface-Type Switching”, A. Sawa and R. Meyer, in “Resistive Switching: From Fundamentals of Nanoionic Redox Processes to Memristive Device Applications” (Eds. D. Ielmini and R. Waser, Wiley-VCH, Germany, 2016).
  2. “Resistive Switching in Oxides”, I. H. Inoue and A. Sawa, in “Functional Metal Oxides: New Science and Novel Applications” (Eds. S. Ogale, T. Venkatesan, and M. Blamire, Wiley-VCH, Germany , 2013).