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Takeaki Yajima Last modified date：2023.09.28

Associate Professor / Electronic Devices
Department of Electronics
Faculty of Information Science and Electrical Engineering


Graduate School
Department of Electronics
Graduate School of Information Science and Electrical Engineering
Undergraduate School
Department of Electrical Engineering and Computer Science
School of Engineering


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Homepage
https://kyushu-u.elsevierpure.com/en/persons/takeaki-yajima
　Reseacher Profiling Tool　Kyushu University Pure
https://www.eng.kyushu-u.ac.jp/e/lab_electrical17
Phone
092-802-3759
Fax
092-802-3759
Academic Degree
Doctor (Science)
Country of degree conferring institution (Overseas)
No
Field of Specialization
Oxide thin films, electronic device and circuit, neuromorphic system
Total Priod of education and research career in the foreign country
00years04months
Outline Activities
Research and education on the fields of oxide thin films, electronic devices and circuits, and neuromorphic systems.
Research
Research Interests
  • Constructive electronics
    keyword : oxide thin film, semiconductor, hydrogen, metal-insulator transition, low-power technology, edge learning, energy harvesting, CMOS circuit
    2020.10.
Academic Activities
Reports
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Papers
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1. Zero-dimensionality of a scaled-down VO2 metal-insulator transition via high-resolution electrostatic gating.
2. Ultra-low-power switching circuits based on a binary pattern generator with spiking neurons.
3. Low Power IoT Circuit Technology Using Spiking Neuron Circuits.
4. T. Yajima, T. Tanaka, Y. Samata, K. Uchida, A. Toriumi, High-speed low-energy heat signal processing via digital-compatible binary switch with metal-insulator transitions., International Electron Devices Meeting (IEDM), 10.1109/IEDM19573.2019.8993502, 903-906, 2019.12.
5. T. Yajima, G. Oike, S. Yamaguchi, S. Miyoshi, T. Nishimura, A. Toriumi, Hydrogenation of the wide-gap oxide semiconductor as a room-temperature and 3D-compatible electron doping technique., AIP Advances, 10.1063/1.5055302, 8, 115133, 2018.09.
6. T. Yajima, T. Nishimura, and A, Toriumi, Analog Spike Processing with High Scalability and Low Energy Consumption Using Thermal Degree of Freedom in Phase Transition Materials., VLSI (Technology), 10.1109/VLSIT.2018.8510649, 18, 27-28, 2018.07.
7. Takeaki Yajima, Tomonori Nishimura, Akira Toriumi, Identifying the Collective Length in VO2 Metal-Insulator Transitions, SMALL, 10.1002/smll.201603113, 13, 12, 2017.03.
8. T. Yajima, T. Nishimura, A. Toriumi, Functional Passive Material VO2 for Analogue Signal Processing with High-Speed, Low Power, and Robust Performance, Technical Digest - International Electron Devices Meeting, IEDM, 10.1109/IEDM.2016.7838540, 2016.12.
9. Takeaki Yajima, Go Oike, Tomonori Nishimura, Akira Toriumi, Independent control of phases and defects in TiO2 thin films for functional transistor channels, PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 10.1002/pssa.201600006, 213, 8, 2196-2202, 2016.08.
10. Takeaki Yajima, Tomonori Nishimura, Akira Toriumi, Positive-bias gate-controlled metal-insulator transition in ultrathin VO2 channels with TiO2 gate dielectrics, NATURE COMMUNICATIONS, 10.1038/ncomms10104, 6, 2015.12.
11. Yajima, Takeaki, Hikita, Yasuyuki, Minohara, Makoto, Bell, Christopher, Mundy, Julia A., Kourkoutis, Lena F., Muller, David A., Kumigashira, Hiroshi, Oshima, Masaharu, Hwang, Harold Y, Controlling band alignments by artificial interface dipoles at perovskite heterointerfaces, Nature Communications, 10.1038/ncomms7759, 2015.06.
12. Takeaki Yajima, Yuma Ninomiya, Tomonori Nishimura, Akira Toriumi, Drastic change in electronic domain structures via strong elastic coupling in VO2 films, PHYSICAL REVIEW B, 10.1103/PhysRevB.91.205102, 91, 20, 2015.05.
13. Yajima, Takeaki, Minohara, Makoto, Bell, Christopher, Kumigashira, Hiroshi, Oshima, Masaharu, Hwang, Harold Y., Hikita, Yasuyuki, Enhanced Electrical Transparency by Ultrathin LaAlO3 Insertion at Oxide Metal/Semiconductor Heterointerfaces, Nano Letters, 10.1021/nl504169m, 2015.02.
14. Takeaki Yajima, Yasuyuki Hikita, Harold Y. Hwang, A heteroepitaxial perovskite metal-base transistor, NATURE MATERIALS, 10.1038/NMAT2946, 10, 3, 198-201, 2011.03.
Presentations
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1. Trends in Power Supply Circuit Technology for Widespread Use of Energy Harvesting.
2. Design of neuromorphic information devices using protons.
Membership in Academic Society
  • THE JAPAN SOCIETY OF APPLIED PHYSICS
  • Material Research Society
  • JAPANESE NEURAL NETWORK SOCIETY
  • JSAP Silicon Technology Devision
  • IEEE
Awards
  • Young Scientist Award by Minister of Education, Culture, Sports, Science and Technology
  • Bachelor Thesis Award
  • Presentation Award
  • Poster Award
  • Graduate Student Award
  • 26th Innovative Frontier Technology Award
  • Young Scientist Award
  • Yasuda Award
  • R & D Encouragement Award
  • Poster Award
  • The 8th Silicon Technology Division Award
  • 40th Japan Society of Applied Physics Paper Award
  • PREST Exchange Meeting, Poster Award
  • Young Researcher Award
  • Excellency in Research in oxide electronics
Educational
Educational Activities
Teaching Fundamentals of Electromagnetism and Application of Quantum Mechanics I for bachelor course. Teaching Neuromorphic Hardware and Group Research Proposal for EEE in graduate school.


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