Development and application of extremely sensitive local magnetic sensor by using ballistic transport properties

• Project/Area Number: 25870548
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nanostructural physics; Applied materials
• Research Institution: Kumamoto University
• Principal Investigator: HARA Masahiro 熊本大学, 大学院先端科学研究部(理), 准教授 (50392080)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: バリスティック伝導 / 二次元電子系 / グラフェン / 微小磁性体 / ナノシート / XMCD / 磁気センサー / 酸化チタン / バリステッィク伝導

Outline of Final Research Achievements

We have demonstrated a highly sensitive detection of magnetic states in the edge of a rectangular ferromagnet by measuring a bend resistance of a ballistic two-dimensional gas. A semiclassical simulation revels that the sensitivity increases when the geometry of the sensor and the spatial distribution of the local field are optimized. We have successfully observed a magnetization process in a ferromagnetic dot with the size of 100 nm. We have also investigated the magnetic behaviors of chemically exfoliated Mn-doped titania nanosheets by X-ray magnetic circular dichroism. Mn atoms in the single-layer nanosheets showed a weak ferromagnetic order. We clearly observed an anti-ferromagnetic coupling between Fe overlayers and the Mn-doped nanosheets.

Research Products

• [Journal Article] Magnetic Proximity Effects between Single-Layer Mn-Doped Titania Nanosheets and Fe Overlayers (2016)
  • Author(s): N. Saitou, Y. Hirano, M. Sawada, H. Namatame, M. Taniguchi, T. Taniguchi, Y. Matsumoto and M. Hara
  • Journal Title: Journal of the Physical Society of Japan Volume: 85 Issue: 3 Pages: 035002-035002
  • DOI: 10.7566/jpsj.85.035002
  • NAID: 210000133886
  • Peer Reviewed / Open Access
• [Journal Article] Geometrical optimization of a local ballistic magnetic sensor (2014)
  • Author(s): Y. Kanda, T. Nomura, T. Kimura, and M. Hara
  • Journal Title: Applied Physics Letters Volume: 104 Issue: 14 Pages: 142408-142408
  • DOI: 10.1063/1.4871002
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Detection of edge magnetic state by a ballistic bend resistance measurement (2013)
  • Author(s): T. Matsunaga, K. Furukawa, Y. Kanda, M. Hara, T. Nomura and T. Kimura
  • Journal Title: Appl. Phys. Lett Volume: 102 Issue: 25 Pages: 252405-252405
  • DOI: 10.1063/1.4812729
  • Peer Reviewed
• [Presentation] Photoresponse and magnetism in single-layer titanium oxide nanosheets (2015)
  • Author(s): M. Hara, K. Matsuzaki, N. Saitou, Y. Hirano, T. Taniguchi and Y. Matsumoto
  • Organizer: 21st International Conference on Electronic Properties of Two-Dimensional Systems
  • Place of Presentation: Sendai International Center
  • Year and Date: 2015-07-26
  • Int'l Joint Research
• [Presentation] 化学剥離酸化チタンナノシートの伝導と磁性 (2015)
  • Author(s): 原正大，松崎浩二，斉藤夏海，谷口貴章，松本泰道
  • Organizer: 物理学会
  • Place of Presentation: 早稲田大学
  • Year and Date: 2015-03-24
• [Presentation] UV photoresponse and magnetic control of single-layer titania nanosheets (2015)
  • Author(s): Masahiro Hara, Koji Matsuzaki, Natsumi Saitou, Takaaki Taniguchi, and Yasumichi Matsumoto
  • Organizer: Graphene 2015
  • Place of Presentation: ビルバオ（スペイン）
  • Year and Date: 2015-03-12
• [Presentation] Co,MnドープチタニアナノシートとFe薄膜の磁気的相互作用 (2014)
  • Author(s): 斉藤夏海，沢田正博，生天目博文，谷口雅樹，谷口貴章，松本泰道，原正大
  • Organizer: ナノ学会
  • Place of Presentation: 京都大学
  • Year and Date: 2014-05-23
• [Presentation] 2端子を狭窄したホールクロスによるパーマロイドットの磁化測定
  • Author(s): 神田侑典，原正大，木村崇
  • Organizer: 日本物理学会
  • Place of Presentation: 徳島大学
• [Presentation] Local magnetic sensor for a single ferromagnetic dot by using a ballistic two-dimensional electron gas
  • Author(s): Yuhsuke Kanda, Takashi Kimura, and Masahiro Hara
  • Organizer: International Symposium on Advanced Nanodevices and Nanotechnology 2013
  • Place of Presentation: カウアイ島（ハワイ）
• [Remarks] 熊本大学大学院自然科学研究科理学専攻物理科学講座原研究室
  • URL: http://crocus.sci.kumamoto-u.ac.jp/physics/meso/index.html
• [Remarks] 熊本大学大学院自然科学研究科理学専攻物理科学講座原研究室
  • URL: http://crocus.sci.kumamoto-u.ac.jp/physics/meso/index.html