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Hitachi

企業情報研究開発

主要論文・業績

量子計測

(1)
A. Tonomura, A. Fukukhara, H. Watanabe and T. Komoda : "Optical Reconstruction of Image from Fraunhofer Electron-Hologram" Jpn. J. Appl. Phys. 7 (1968) 295.
1968年Demonstrated the possibility of holography with an electron beam
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A. Tonomura, T. Matsuda, J. Endo, T. Arii and K. Mihama : "Direct Observation of Fine Structure of Magnetic Domain Walls by Electron Holography" Phys. Rev. Lett. 44 (1980) 1430-1433.
1978年Put electron holography to practical use by developing a "coherent" field-emission electron microscope
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A. Tonomura, T. Matsuda, R. Suzuki, A. Fukuhara, N. Osakabe, H. Umezaki, J. Endo, K. Shinagawa, Y. Sugita and H. Fujiwara : "Observation of Aharonov-Bohm Effect by Electron Holography" Phys. Rev. Lett. 48 (1982) 1443-1446.
1980年Invented a method of directly observing microscopic magnetic lines of force as electron phase contours.
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T. Matsuda, J. Endo, N. Osakabe, A. Tonomura and T. Arii : "Morphology and Structure of Biogenic Magnetite Particles" Nature 302 (31 March 1983) 411-412.
1980-83年Produced evidence for the Aharonov-Bohm effect using transparent toroidal magnets
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A. Tonomura, T. Matsuda, T. Kawasaki, J. Endo and N. Osakabe : "Sensitivity-Enhanced Electron-Holographic Interferometry and thickness-Measurement Applications at Atomic Scale" Phys. Rev. Lett. 54 (1985) 60-62.
1985年Developed a method to measure electron phase shifts as precisely as 1/50 of 2π .
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A. Tonomura, N. Osakabe, T. Matsuda, T. Kawasaki, J. Endo, S. Yano and H. Yamada : "Evidence for Aharonov- Bohm Effect with Magnetic Field Completely Shielded from Electron Wave" Phys. Rev. Lett. 56 (1986) 792-795.
1986年Established the physical reality of gauge fields by producing definitive evidence for the Aharonov-Bohm effect using toroidal magnets covered with superconductors.
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A. Tonomura : "Applications of electron holography" Rev. Mod. Phys. 59 (1987) 637-669.
1989年Directly observed the magnetic lines of individual vortices penetrating superconductors.
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A. Tonomura, J. Endo. T. Matsuda, T. Kawasaki and H. Ezawa :"Demonstration of Single-Electron Buildup of an Interference Pattern" Amer. J. Phys. 57 (1989) 117-120.
1989年Demonstrated single-electron build-up of an interference pattern.
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N. Osakabe, J. Endo, T. Matsuda, A. Tonomura and A. Fukuhara :"Observation of Surface Undulation Due to Single-Atomic Shear of a Dislocation by Reflection-Electron Holography" Phys. Rev. Lett. 62 (1989) 2969-2972.
1992年Developed a technique for dynamically observing vortices in superconductors.
(10)
M. Peshkin and A. Tonomura : The Aharonov-Bohm Effect"Lecture Notes in Physics, 340 (Springer-Verlag, Heidelberg, 1989).
1993年Determined the regions in magnetic field and temperature where vortices in high-Tc superconductors can exist statically.
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K. Harada, T. Matsuda, J. Bonevich, M. Igarashi, S. Kondo, G. Pozzi, U. Kawabe and A. Tonomura :"Real-time observation of vortex lattices in a superconductor by electron microscopy" Nature 360 ( 5 November 1992) 51-53.
1996年Found "intermittent vortex rivers" near pinning centers.
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Harada, T. Matsuda, H. Kasai, J. E. Bonevich, T. Yoshida and A. Tonomura :"Vortex Configuration and Dynamics in Bi2Sr1.8 CaCuOx Thin Film by Lorentz Microscopy" Phys. Rev. Lett. 71 (1993) 3371-3374.
1996年Elucidated the microscopic mechanism of the peak effect in critical current in superconductors
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T. Matsuda, K. Harada, H. Kasai, O. Kamimura, and A. Tonomura :"Observation of Dynamic Interaction of Vortices with Pinning Centers by Lorentz Microscopy" Science 271 (8 March 1996) 1393-1395.
1997年Determined the vortex-vortex pair potential from the dynamic observation of thermally activated vortex hopping.
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K. Harada, O. Kamimura, H. Kasai, T. Mastuda, and A. Tonomura :"Direct Observation of Vortex Dynamics in Superconducting Films with Regular Arrays of Defects" Science 274 (15 November 1996) 1167-1169.
1997年Determined the vortex-vortex pair potential from the dynamic observation of thermally activated vortex hopping.
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A. Tonomura :"The Quantum World Unveiled by Electron Waves" World Scientific, Singapore (1998)
1999年Found two different movements of vortices in high-Tc superconductors above and below 25K.
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A. Tonomura, H. Kasai, O. Kamimura, T. Matsuda, K. Harada, J. Shimoyama, K. Kishio and K. Kitazawa: "Motion of vortices in superconductors" Nature 397(28 January 1999) 308-309.
2000年Developed 1MV field-emission electron microscope having the brightest electron beam and the highest lattice resolution.
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A. Tonomura: "Electron Holography"-2nd Edition, Springer, Heidelberg (1999)
2001年Observed the different arrangements of vortex lines trapped and untrapped along tilted columnar defects inside high-Tc superconductors with the 1MV electron microscope
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T. Kawasaki, T. Yoshida, T. Matsuda, N. Osakabe, A. Tonomura, I. Matsui and K. Kitazawa: "Fine crystal lattice fringes observed using a transmission electron microscope with 1-Mev coherent electron waves" Appl. Phys. Lett. 76 (2000) 1342-1344.
2002年Found the oscillation of a row of vortices reflecting the layered structure of high-Tc superconductors
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A. Tonomura, H. Kasai, O. Kamimura, T. Matsuda, K. Harada, Y. Nakayama, J. Shimoyama, K. Kishio, T. Hanaguri, K. Kitazawa, M. Sasae and S. Okayasu: "Observation of individual vortices trapped along columnar defects in high-temperature superconductors" Nature 412(2001) 620-622.
2002年Found the formation mechanism of chain vortices in high- Tc superconductors at tilted magnetic fields
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T. Matsuda, O. Kamimura, H. Kasai, K. Harada, T. Yoshida, T. Akashi, A. Tonomura, Y. Nakayama, J. Shimoyama, K. Kishio, T. Hanaguri, K. Kitazawa:"Oscillating Rows of Vortices in Superconductors"Science 294 (7 December 2001) 2136-2138.
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A. Tonomura, K. Kasai, O. Kamimura, T. Matsuda, K. Harada, T. Yoshida, T. Akashi, J. Shimoyama, K. Kishio, T. Hanaguri, K. Kitazawa, T. Masui, S. Tajima, N. Koshizuka, P.L. Gammel, D. Bishop, M. Sasase and S. Okayasu"Observation of Stuructures of Chain Vortices Inside Anisotropic High-Tc Superconductors"Phys. Rev. Lett. 88 (2002) 237001-237004.
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