産総研

Dr. SAWA, Akihito

last updated March 31, 2023
photo
Dr. SAWA, Akihito
Director
Research Institute for Advanced Electronics and Photonics
National Institute of Advanced Industrial Science and Technology (AIST)


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Education
  • February 2001 Ph.D, University of Tsukuba
  • March 1991 M.E., University of Tsukuba
  • March 1989 B.E., University of Tsukuba
Career
  • April 2021 Director, Research Institute for Advanced Electronics and Photonics, National Insititute of Advanced Industrial Science and Technology (AIST)
  • April 2019 Director, Research Planning Office, Department of Electronics and Manufacturing, 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)
  • April 2011 Leader, Correlated Electronics Group, Electronics and Photonics Research Institute, National Insititute of Advanced Industrial Science and Technology (AIST)
  • April 2008 Leader, Correlated Electron Heterointerfaces Group, Nanoelectronics Research Institute, National Insititute of Advanced Industrial Science and Technology (AIST)
  • June 2002 - May 2003 Guest Researcher, University of Augsburg
  • April 2001 Senior Research Scientist, Correlated Electron Research Center (CERC), National Insititute of Advanced Industrial Science and Technology (AIST)
  • April 1991 Research Scientist, Electrotechnical Laboratory (ETL)
Publications

１．Papers

  • H. Yamada, Y. Toyosaki, and A. Sawa, “Ferroelectricity and pseudo-coherent growth in HfO2/SrHfO3 nanolaminates”, Journal of Applied Physics 133, 095301 (2023).
  • K. Shibuya and A. Sawa, “Epitaxial growth and polarized Raman scattering of niobium dioxide films”, AIP Advances 12, 055103 (2022).
  • K. Shibuya, K. Ishii, Y. Atsumi, T. Yoshida, Y. Sakakibara, M. Mori, and A. Sawa, “Switching dynamics of silicon waveguide optical modulator driven by photothermally induced metal-insulator transition of vanadium dioxide cladding layer”, Optics Express 28, 37188 (2020).
  • P. Stoliar, H. Yamada, Y. Toyosaki, and A. Sawa, “Spike-shape dependence of the spike-timing dependent synaptic plasticity in ferroelectric-tunnel-junction synapses”, Scientific Reports 9, 17740 (2019).
  • 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).
  • 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).
  • 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, 3948 (2018).
  • 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).
  • 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).
  • 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 B 97, 014409 (2018).
  • K. Shibuya and A. Sawa,“Raman scattering of epitaxial vanadium dioxide films with low-temperature monoclinic phase”, Journal of Applied Physics 122, 015307 (2017).
  • 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).
  • 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).
  • 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).
  • K. Shibuya and A. Sawa, “Modulation of Metal-Insulator Transition in VO2 by Electrolyte Gating-Induced Protonation”, Advanced Electronic Materials 2, 1500131 (2016).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • A. Tsurumaki-Fukuchi, H. Yamada, and A. Sawa, “Resistive switching artificially induced in a dielectric/ferroelectric composite diode”, Applied Physics Letters, 103, 152903 (2013).
  • 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).
  • 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).
  • 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).
  • 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).
  • P.-H. Xiang, H. Yamada, H. Akoh, and A. Sawa, “Phase diagrams of strained Ca1-xCexMnO3 films”, Journal of Applied Physics 112, 113703 (2012).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • A. Sawa, “Resistive switching in transition-metal oxides”, Materials Today, 11, 6, 28-36 (2008).
  • 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).
  • 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).
  • T. Fujii, M. Kawasaki, A. Sawa, Y. Kawazoe, H. Akoh, 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).
  • “Optical probe of electrostatic doping in an n-type Mott insulator”, M. Nakamura, A. Sawa, H. Sato, H Akoh, M. Kawasaki, and Y. Tokura, Physical Review B 75,　155103-1-5 (2007).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • 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).
  • Y. Mawatari, A. Sawa, and H. Obara, “Critical state of YBa2Cu3Oy disc in perpendicular fields”, Physica C 258, 121-128 (1996).
  • 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).
  • 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).
  • H. Obara, A. Sawa, and S. Kosaka, “Magnetization properties and irreversibility lines of YBCO/PBCO multilayered films”, Physical Review B 49, 1224-1232 (1994).
  • 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).

    • 2．Books

  • “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).
  • “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).