Tsuyoshi Hasegawa

Tsuyoshi Hasegawa
Academic degree:
Ph.D. (science), Tokyo Institute of Technology (1996)
Recent publications
See NIMS Researchers DB
Home Page:
See Atomic Electronics Group, MANA, NIMS

Educational & Working History

2006 Group Leader, National Institute for Materials Science (NIMS)
2003 Associate Director, NIMS
2002 Senior Researcher, NIMS
1999 Senior Research Scientist, The Institute of Chemical and Physical Research (RIKEN)
1997 Senior Researcher, Central Research Laboratory, Hitachi Ltd.
1996 Ph. D. in Physics, Tokyo Institute of Technology
1987 Researcher, Central Research Laboratory, Hitachi Ltd.

Research History

He has been working on the surface science and the electronic devices. As a researcher of HCRL, he achieved atomic manipulation at room temperature using a scanning tunneling microscope (STM) to write atomic words, 'Peace 91 HCRL', for praying peace against Gulf Crisis. This was the first experiment in the world of manipulating a single atom in the surface layer. He also succeeded in dynamic observation of Si crystal growth with atomic resolution using STM. For carrying out these experiments, he developed original STMs with his coworkers. In Hitachi, he also worked on development of electronic devices, such as DRAM and Logic Devices. He developed a multi-probe STM combined with a scanning electron microscope (SEM) for failure analysis of the devices. His instrument has enabled direct measurement of a single semiconductor transistor formed on a chip, which drastically shortens the Turn Around Time (TAT) of the device development.

After moving to RIKEN, he returned to a fundamental research field, and started to develop multi-probe atomic force microscope combined with SEM. By using the instruments, he succeeded in observing switching phenomenon of nano-ionics device developed with his colleagues. The device is named Atomic Switch. He also succeeded in forming basic logic circuits using Atomic Switch. These successful experimental results and good enough performance of the device has been reported by NATURE in 2005. Collaboration with an electrical company has started to make practical device, which is expected to be commercially available in five years. He has conducted the research group of the Atomic Switch since 2003, with a supervision of Prof. Aono.

Selected Papers

  1. Conductance quantization and synaptic behavior in a Ta2O5-based atomic switch
    T. Tsuruoka, T. Hasegawa, K. Terabe and M. Aono
    Nanotechnology, 2012, 23, 435705.
  2. Atomically controlled electrochemical nucleation at superionic solid electrolyte surfaces electrolyte surfaces
    I. Valov, I. Sapezanskaia, A. Nayak, T. Tsuruoka, T. Bredow, T. Hasegawa, G. Staikov, Masakazu Aono and Rainer Waser
    Nature Materials, 2012, 11, 530-535.
  3. Atomically controlled electrochemical nucleation at superionic solid electrolyte surfaces electrolyte surfaces
    T. Ohno, T. Hasegawa, T. Tsuruoka, K. Terabe, J. K. Gimzewski and M. Aono
    Nature Materials, 2011, 10, 591-595.
  4. A polymer-electrolyte-based atomic switch
    S. Wu, T. Tsuruoka, K. Terabe, T. Hasegawa, J. P. Hill, K. Ariga and M. Aono
    Adv. Funct. Mater., 2011, 21, 93-99.
  5. Forming and switching mechanisms of a cation-migration-based oxide resistive memory
    T. Tsuruoka, K. Terabe, T. Hasegawa and M. Aono
    Nanotechnology, 2010, 21, 425205.
  6. Photo-assisted formation of an atomic switch
    T. Hino, H. Tanaka, T. Hasegawa, M. Aono and T. Ogawa
    Small, 2010, 6, 1745-1748.
  7. Size tunable UV luminescent silicon nanocrystals
    N. Shirahata, T. Tsuruoka, T. Hasegawa and Y. Sakka
    Small, 2010, 6, 915-921.
  8. Learning abilities achieved by a single solid-state atomic switch
    T. Hasegawa, T. Ohno, K. Terabe, T. Tsuruoka, T. Nakayama, J. K. Gimzewski and M. Aono
    Adv. Mater., 2010, 22, 1831-1834.
  9. A nonvolatile programmable solid-electrolyte nanometer switch
    S. Kaeriyama, T. Sakamoto, H. Sunamura, M. Mizuno, H. Kawaura, T. Hasegawa, K. Terabe, T. Nakayama and M. Aono
    IEEE J. Solid-State Circuits, 2005, 40, 168-176.
  10. Short-term plasticity and long-term potentiation mimicked in single inorganic synapses
    Terabe K, Hasegawa T, Nakayama T, Aono M
    Nature, 2005; 433, 47-50.