Highly sensitive magnetic field sensor using nano-scale magnets

• Project/Area Number: 16H03850
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied materials
• Research Institution: Osaka University
• Principal Investigator: Suzuki Yoshishige 大阪大学, 基礎工学研究科, 教授 (50344437)
• Co-Investigator(Kenkyū-buntansha): 三輪 真嗣 東京大学, 物性研究所, 准教授 (20609698)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000); Fiscal Year 2018: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2017: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2016: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
• Keywords: 磁性体 / スピントロニクス / トンネル磁気抵抗素子 / 磁界センサー / センサーアレイ / 磁気共鳴 / 微小センサー / 1/fノイズ / 非線形マグノイズ / 二重共鳴 / スピンエレクトロニクス

Outline of Final Research Achievements

This research was done aiming a fabrication of highly sensitive magnetic field sensor avoiding a noise from edge of the magnetic film by use of nano-scale magnetic cells. As a result, the magnetic noise in cellular phone frequency can be reduced down to the theoretical limit but it in voice frequency shows larger noise caused by a fluctuation in the magnet at the edge. Calculation of skyrmion dynamics shows reduction of the voice frequency noise in infinite film.

Academic Significance and Societal Importance of the Research Achievements

医療で重要な脳磁計や心磁計には極低温でしか動作しないセンサーが使用されているためコストが高く、これらの装置は大病院にしか設置されていない。室温で動作する安価で超高感度な磁界センサーが出来ればこれらの検査機器を家庭医でも、あるいは個人でも持つことができるようになり心臓病や脳内の異常を早期に発見できるようになると考えられる。本研究はそのようなセンサーを開発するための基礎研究である。今回の研究成果は磁石を用いた磁界センサーの高感度化の障害となっている磁石の熱による乱れの影響を避ける方法のヒントとなるものである。

Research Products

• [Journal Article] Microwave amplification in a magnetic tunnel junction induced by heat-to-spin conversion at the nanoscale (2019)
  • Author(s): M. Goto, Y. Wakatake, U.K. Oji, S. Miwa, N. Strelkov, B. Dieny, H. Kubota, K. Yakushiji, A. Fukushima, S. Yuasa, and Y. Suzuki
  • Journal Title: Nature Nanotechnology Volume: 14 Issue: 1 Pages: 40-43
  • DOI: 10.1038/s41565-018-0306-9
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Interface resonance in Fe/Pt/MgO multilayer structure with large voltage controlled magnetic anisotropy change (2019)
  • Author(s): Jibiki Y.、Goto M.、Tsujikawa M.、Risius P.、Hasebe S.、Xu X.、Nawaoka K.、Ohkubo T.、Hono K.、Shirai M.、Miwa S.、Suzuki Y.
  • Journal Title: Applied Physics Letters Volume: 114 Issue: 8
  • DOI: 10.1063/1.5082254
  • Peer Reviewed / Int'l Joint Research
• [Presentation] スピンダイナミクスによるレザバコンピューティング (2019)
  • Author(s): 三輪真嗣
  • Organizer: 東北大学電気通信研究所 共同プロジェクト研究会
• [Presentation] Negative Resistance and Amplification of Microwave in Heat-driven Magnetic Tunnel Junctions (2019)
  • Author(s): M. Goto
  • Organizer: 2019Joint MMM-Intermag Conference
  • Int'l Joint Research
• [Presentation] Brownian motion of skyrmion bubbles on wire (2019)
  • Author(s): Y. Jibiki
  • Organizer: 2019Joint MMM-Intermag Conference
  • Int'l Joint Research
• [Presentation] Toward skyrmion Brownian computing (2019)
  • Author(s): Y. Suzuki
  • Organizer: International School on Spintronics and Korea-Japan Spintronics Workshop -Topological Phenomena in Magnetism-
  • Int'l Joint Research / Invited
• [Presentation] Electric-field-induced change of perpendicular magnetic anisotropy at metal/dielectric interfacel (2019)
  • Author(s): S. Miwa
  • Organizer: Topological Phases and Functionality of Correlated Electron Systems (TPFC2019)
• [Presentation] Radio-frequency magnetic field sensitivity of magnetic vortex in magnetic tunnel junctions (2019)
  • Author(s): R. Okuno
  • Organizer: The 66th JSAP Spring Meeting 2019
• [Presentation] 分子/金属界面を用いたスピントロニクスデバイス (2019)
  • Author(s): 三輪真嗣
  • Organizer: 日本物理学会第74回年次大会, シンポジウム「有機分子と表面の出会いがもたらす多体相関物性」
  • Invited
• [Presentation] Quantum spintronics for application (2018)
  • Author(s): S. Miwa
  • Organizer: International Workshop: Novel Phenomena in Quantum Materials driven by Multipoles and Topology
  • Int'l Joint Research / Invited
• [Presentation] トンネル磁気抵抗素子による高周波の増幅 (2018)
  • Author(s): 後藤 穣
  • Organizer: 「スピントロ二クスの新しい応用」シンポジウム・H29度総務省（課題Ⅱ）成果報告会
• [Presentation] The origin of electric-field-induced change of magnetocrystalline anisotropy in metallic multilayered structures (2018)
  • Author(s): S. Miwa
  • Organizer: 23rd International Colloquim on Magnetic Films and Surfaces (ICMFS 2018)
  • Int'l Joint Research / Invited
• [Presentation] 遷移金属及び分子による磁性界面制御 (2018)
  • Author(s): 三輪真嗣
  • Organizer: 第79回応用物理学会秋季学術講演会: シンポジウム「スピントロニクス材料研究の新潮流～二次元系を中心に～」
  • Invited
• [Presentation] Evaluation of heat-driven spin-torque in a magnetic tunnel junction through time-resolved measurement (2018)
  • Author(s): N. Furuichi
  • Organizer: 磁気記録・情報ストレージ研究会
• [Presentation] 一次元及び二次元におけるスキルミオンのブラウン運動 (2018)
  • Author(s): 地引勇磨
  • Organizer: 磁気記録・情報ストレージ研究会
• [Presentation] Voltage control of interfacial spin-orbit phenomena (2018)
  • Author(s): S. Miwa
  • Organizer: 2018 KPS Fall Meeting Pioneer Symposia “Symposium on Interface Spin-Orbitronics”
  • Int'l Joint Research / Invited
• [Presentation] スピンダイナミクスによるレザバコンピューティング (2018)
  • Author(s): 三輪真嗣
  • Organizer: 第2回CSRN-Tokyo Workshop 2018「スピン、ニューロモルフィック・コンピューティング」
• [Presentation] Heat driven microwave amplification in magnetic tunnel junction with double MgO layer (2018)
  • Author(s): M. Goto
  • Organizer: CSRN-OSAKA Annual Workshop 2018
• [Presentation] Simulation of microwave excitation in micro strip line induced by radio-frequency signal amplification using magnetic tunnel junctions (2018)
  • Author(s): Minori Goto、Yosuke Wakatake、Ugwumsinachi Kalu Oji、Nikita Strelkov、Bernard Dieny、Shinji Miwa、Hitoshi Kubota、Kay Yakushiji、Akio Fukushima、Shinji Yuasa、Yoshishige Suzuki
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] Time resolved measurement of Joule-heating-induced magnetization dynamics in magnetic tunnel junctions (2018)
  • Author(s): Natsumi Furuichi、Minori Goto、Eiiti Tamura、Hitoshi Kubota、Kay Yakushiji、Akio Fukushima、Shinji Yuasa、Nikita Strelkov、Bernard Dieny、Shinji Miwa、Yoshishige Suzuki
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] Heat induced ferromagnetic resonance of FeB thin film sandwiched between MgO thermal insulators (2017)
  • Author(s): M. Goto, Y. Wakatake, U. K. Oji, S. Miwa, N. Strelkov, B. Dieny, H. Kubota, K. Yakushiji, A. Fukushima, S. Yuasa, Y. Suzuki
  • Organizer: PASPS-22
• [Presentation] Spin dynamics with magnetic anisotropy change driven by Joule heating (2017)
  • Author(s): 古市菜都美、後藤 穣、田村英一、久保田均、薬師寺啓、福島章雄、湯浅新治、 三輪真嗣、鈴木義茂
  • Organizer: PASPS-22
• [Presentation] Radio-Frequency Amplification of Electric Signal Controlled by Joule Heating and Spin Transfer Torque in Magnetic Tunnel Junctions (2017)
  • Author(s): M. Goto, Y. Wakatake, U.K. Oji, S. Miwa, H. Kubota, K. Yakushiji, A. Fukushima, S. Yuasa and Y. Suzuki
  • Organizer: MMM2017（62nd Annual Conference on Magnetism and Magnetic Materials)
  • Int'l Joint Research
• [Presentation] Ferromagnetic resonance controlled by Joule heating in magnetic tunnel junctions (2017)
  • Author(s): 後藤 穣、若竹陽介、Ugwumsinachi Kalu Oji、三輪真嗣、久保田均、薬師寺啓、福島章雄、湯浅新治、鈴木義茂
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] Amplification of microwave by a dc biased magnetic tunnel junction (2016)
  • Author(s): 17.Y. Wakatake, M. Goto, U. Oji1, S. Miwa, H. Kubota, K. Yakushiji, A. Fukushima, S. Yuasa, and Y. Suzuki
  • Organizer: Korea-Japan Spin-Orbit Workshop
  • Place of Presentation: 九州大学（福岡県福岡市）
  • Year and Date: 2016-12-16
  • Int'l Joint Research