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Development of inexpensive Hall effects measurement system using two-AC method

Research Project

Project/Area Number 20K20887
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionTohoku University

Principal Investigator

Yoshimatsu Kohei  東北大学, 多元物質科学研究所, 講師 (30711030)

Project Period (FY) 2020-07-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywordsホール効果測定 / 電子材料 / 装置開発 / 交流測定 / ロックイン検出 / 二交流法 / 永久磁石 / ステッピングモータ / ロックイン法 / 酸化物薄膜 / 交流法
Outline of Research at the Start

ホール効果測定は電子材料にとって最重要なキャリア密度と移動度の物性値を実験的に決定できる手法である。測定には磁場の印可が不可欠であり、超伝導マグネットを用いた強磁場を必要とする。しかし超伝導マグネットは非常に高価であり、冷却に必要な液体ヘリウムの問題も抱えている。そこで本研究では、永久磁石の回転と交流電流を用いた二交流ホール効果測定装置を開発し、安価で高感度に材料の電子物性を決定する手法を確立する。

Outline of Final Research Achievements

I first constructed the two-AC Hall-effect measurement system. Using the inexpensive Neodymium permanent magnets and stepping motors, the AC magnetic field can be generated with the maximum frequency of as high as 100 Hz. The generation of the two AC signals was revealed from the lock-in detection, indicating the ideal output of two AC Hall voltage. Then, I demonstrated the two AC Hall-effect measurements with a typical oxide semiconductor of zinc oxide. I found that the similar Hall voltages were obtained from the two AC and usual DC Hall-effect measurements. These results indicate that the present two-AC Hall-effect measurement system is high sensitive and inexpensive technique to determine the electronic properties of materials.

Academic Significance and Societal Importance of the Research Achievements

ホール効果測定は、半導体などの電子材料の電子物性を明らかにする重要な測定手法である。ホール効果測定には磁場の印加が不可欠であるが、高いS/N比を得るには強磁場が必要となる。しかし、高磁場印可には高価な超伝導電磁石や液体ヘリウムの冷媒が必要となる。そのため、安価で高感度なホール効果測定法の開発が望まれている。本研究では、永久磁石とステッピングモータにより生成した交流磁場と交流電流印加により2つの周波数が重なったホール電圧をロックイン検出するに交流ホール効果測定法を提案し装置開発を行った。安価で冷媒不要の特徴ながら高感度な測定を実現し、電子物性評価の新たな手法開発として重要な成果である。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (21 results)

All 2022 2021 2020 Other

All Journal Article (12 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 12 results,  Open Access: 3 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (4 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Development of a versatile micro-focused ARPES system with Kirkpatrick-Baez mirror optics2022

    • Author(s)
      M. Kitamura, S. Souma, A. Honma, D. Wakabayashi, H. Tanaka, A. Toyoshima, K. Amemiya, T. Kawakami, K. Sugawara, K. Nakayama, K. Yoshimatsu, H. Kumigashira, T. Sato, K. Horiba
    • Journal Title

      Review of Scientific Instruments

      Volume: 93 Issue: 3 Pages: 033906-033906

    • DOI

      10.1063/5.0074393

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Two-dimensional superconductivity in single-band correlated 2H-type NbO2 layers2022

    • Author(s)
      Soma Takuto、Yoshimatsu Kohei、Horiba Koji、Kumigashira Hiroshi、Ohtomo Akira
    • Journal Title

      Physical Review B

      Volume: 105 Issue: 10 Pages: 104504-104504

    • DOI

      10.1103/physrevb.105.104504

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Direct Synthesis of Metastable λ-Phase Ti3O5 Films on LaAlO3 (110) Substrates at High Temperatures2021

    • Author(s)
      Yoshimatsu Kohei、Kumigashira Hiroshi
    • Journal Title

      Crystal Growth & Design

      Volume: 22 Issue: 1 Pages: 703-710

    • DOI

      10.1021/acs.cgd.1c01214

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Heavy-fermion metallic state and Mott transition induced by Li-ion intercalation in LiV2O4 epitaxial films2021

    • Author(s)
      Yajima Tatsuya、Soma Takuto、Yoshimatsu Kohei、Kurita Nobuyuki、Watanabe Masari、Ohtomo Akira
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 24 Pages: 245104-245104

    • DOI

      10.1103/physrevb.104.245104

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electronic structure of SrTi1-xVxO3 films studied by in situ photoemission spectroscopy: Screening for a transparent electrode material2021

    • Author(s)
      Kanda Tatsuhiko、Shiga Daisuke、Yukawa Ryu、Hasegawa Naoto、Nguyen Duy Khanh、Cheng Xianglin、Tokunaga Ryosuke、Kitamura Miho、Horiba Koji、Yoshimatsu Kohei、Kumigashira Hiroshi
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 11 Pages: 115121-115121

    • DOI

      10.1103/physrevb.104.115121

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Epitaxial stabilization of complete solid-solution β-(AlxGa1-x)2O3 (100) films by pulsed-laser deposition2021

    • Author(s)
      R. Wakabayashi, K. Yoshimatsu, M. Hattori, J.-S. Lee, O. Sakata, A. Ohtomo
    • Journal Title

      Crystal Growth and Design

      Volume: 21 Issue: 5 Pages: 2844-2849

    • DOI

      10.1021/acs.cgd.1c00030

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Resonant tunneling driven metal-insulator transition in double quantum-well structures of strongly correlated oxide2021

    • Author(s)
      Yukawa R.、Kobayashi M.、Kanda T.、Shiga D.、Yoshimatsu K.、Ishibashi S.、Minohara M.、Kitamura M.、Horiba K.、Santander-Syro A. F.、Kumigashira H.
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 7070-7070

    • DOI

      10.1038/s41467-021-27327-z

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Superconducting Dome Underlying Bipolaronic Insulating State in Charge-doped Ti4O7 Epitaxial Films2021

    • Author(s)
      Soma Takuto、Kobayashi Tomohiro、Yoshimatsu Kohei、Ohtomo Akira
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Issue: 2 Pages: 023705-023705

    • DOI

      10.7566/jpsj.90.023705

    • NAID

      40022484944

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Optical and structural investigations on titanium oxynitride films for visible-UV photocatalytic applications2020

    • Author(s)
      Mizushiro Jun、Yoshimatsu Kohei、Ohashi Naoki、Tanaka Masahiko、Sakata Osami、Ohtomo Akira
    • Journal Title

      Journal of Applied Physics

      Volume: 127 Issue: 13 Pages: 135301-135301

    • DOI

      10.1063/1.5143609

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Thickness dependence of electronic structures in VO2 ultrathin films: Suppression of the cooperative Mott-Peierls transition2020

    • Author(s)
      Shiga D.、Yang B. E.、Hasegawa N.、Kanda T.、Tokunaga R.、Yoshimatsu K.、Yukawa R.、Kitamura M.、Horiba K.、Kumigashira H.
    • Journal Title

      Physical Review B

      Volume: 102 Issue: 11 Pages: 115114-115114

    • DOI

      10.1103/physrevb.102.115114

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] p-type transparent superconductivity in a layered oxide2020

    • Author(s)
      Soma Takuto、Yoshimatsu Kohei、Ohtomo Akira
    • Journal Title

      Science Advances

      Volume: 6 Issue: 29

    • DOI

      10.1126/sciadv.abb8570

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant2020

    • Author(s)
      Yoshimatsu K.、Hasegawa N.、Nambu Y.、Ishii Y.、Wakabayashi Y.、Kumigashira H.
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 22109-22109

    • DOI

      10.1038/s41598-020-79182-5

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] LaAlO3 (110)基板上へのλ型Ti3O5薄膜の直接合成2022

    • Author(s)
      吉松 公平, 組頭 広志
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Metallic conductivity in undoped Ti2O3 films2021

    • Author(s)
      K. Yoshimatsu, N. Hasegawa, Y. Nambu, Y. Ishii, Y. Wakabayashi, H. Kumigashira
    • Organizer
      Materials Research Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Metal-insulator transition of corundum-type Ti2O3 films2021

    • Author(s)
      K. Yoshimatsu
    • Organizer
      CONMAT 2021 Global Summit on Condensed Mater Physics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 金属伝導を示すTi2O3薄膜2021

    • Author(s)
      吉松 公平、長谷川 直人,南部 雄亮,石井 祐太,若林 裕助,組頭 広志
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Remarks] 新しい酸化チタンの高品質結晶合成に成功 環境に優しい光・電子デバイスの実現へ

    • URL

      http://www2.tagen.tohoku.ac.jp/lab/news_press/20211217/

    • Related Report
      2021 Annual Research Report
  • [Remarks] 新しい酸化チタンの高品質結晶合成に成功 環境に優しい光・電子デバイスの実現へ

    • URL

      http://www.tohoku.ac.jp/japanese/2021/12/press20211217-01-Ti.html

    • Related Report
      2021 Annual Research Report
  • [Remarks] 安価な「光記憶素子」作製へ、ラムダ型五酸化三チタンの高品質単結晶薄膜を形成

    • URL

      https://newswitch.jp/p/30136

    • Related Report
      2021 Annual Research Report
  • [Remarks] 従来の100万倍大きな高品質な酸化チタン結晶、東北大が合成に成功

    • URL

      https://news.mynavi.jp/techplus/article/20211220-2234120/

    • Related Report
      2021 Annual Research Report
  • [Patent(Industrial Property Rights)] λ-Ti3O5膜形成基板およびλ-Ti3O5膜形成基板の製造方法2021

    • Inventor(s)
      吉松公平
    • Industrial Property Rights Holder
      吉松公平
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2021-144696
    • Filing Date
      2021
    • Related Report
      2021 Annual Research Report

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Published: 2020-08-03   Modified: 2023-01-30  

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