antiferromagnetic magnon spin valve

• Project/Area Number: 17K14331
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: Hou Dazhi 東北大学, 材料科学高等研究所, 助教 (00704355)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: antiferromagnet / spin Hall effect / SMR / spin pumping / spin Seebeck effect / spintronics / spin valve / spin transistor / magnon spin valve

Outline of Final Research Achievements

We succeed to manipulate the spin transmission of an antiferromagnetic insulator by external
magnetic field which rotates the Neel vector. A new phenomenon "spin colossal magnetoresistance" is established in this study. This work also lays the foundation for the development of insulator-based spin current circuit. In addition, the magnetic field angle dependence of the SMR in a heavy metal/antiferromagnetic insulator bilayer is calculated analytically.

Academic Significance and Societal Importance of the Research Achievements

我々は、反強磁性絶縁体に新しい効果、巨大スピン磁気抵抗を発見した。 これは全絶縁体スピン流回路への実質的な進歩であり、これは動作中のエネルギーコストがはるかに低く、それ故にグリーン社会に不可欠な装置である。 スピン流制御のメカニズムも我々の研究でよく理解されており、それはさらなるデバイス開発の基礎を築くものである。

Research Products

• [Journal Article] Magnon detection using a ferroic collinear multilayer spin valve (2018)
  • Author(s): J. Cramer, F. Fuhrmann, U. Ritzmann, V. Gall, T. Niizeki, R. Ramos, Z. Qiu, D. Hou, T. Kikkawa, J. Sinova, U. Nowak, E. Saitoh, and M. Kläui
  • Journal Title: Nature Communications Volume: 8 Issue: 1 Pages: 1089-1089
  • DOI: 10.1038/s41467-018-03485-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The bimodal distribution spin Seebeck effect enhancement in epitaxial Ni0.65Zn0.35Al0.8Fe1.2O4 thin film (2018)
  • Author(s): H. Wang, D. Hou, T. Kikkawa, R. Ramos, K. Shen, Z. Qiu, Y. Chen, M. Umeda, Y. Shiomi, X. Jin, and E. Saitoh
  • Journal Title: Applied Physics Letters Volume: 112 Issue: 14 Pages: 142406-142406
  • DOI: 10.1063/1.5022195
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spin colossal magnetoresistance in an antiferromagnetic insulator (2018)
  • Author(s): ZY. Qiu, D. Hou, J. Barker, K. Yamamoto, O. Gomonay, and E. Saitoh
  • Journal Title: Nature Materials Volume: 17 Issue: 7 Pages: 577-580
  • DOI: 10.1038/s41563-018-0087-4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Antiferromagnetic anisotropy determination by spin Hall magnetoresistance (2017)
  • Author(s): Wang Hua、Hou Dazhi、Qiu Zhiyong、Kikkawa Takashi、Saitoh Eiji、Jin Xiaofeng
  • Journal Title: Journal of Applied Physics Volume: 122 Issue: 8 Pages: 083907-083907
  • DOI: 10.1063/1.4986372
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Time-resolved study of field-induced suppression of longitudinal spin Seebeck effect (2017)
  • Author(s): Hioki Tomosato、Iguchi Ryo、Qiu Zhiyong、Hou Dazhi、Uchida Ken-ichi、Saitoh Eiji
  • Journal Title: Applied Physics Express Volume: 10 Issue: 7 Pages: 073002-073002
  • DOI: 10.7567/apex.10.073002
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Spin colossal magnetoresistance in an antiferromagnetic insulator (2019)
  • Author(s): Hou Dazhi、Qiu Zhiyong、Barker Joseph、Yamamoto Kei、Gomonay Olena、Saitoh Eiji
  • Organizer: APS March Meeting 2019
  • Int'l Joint Research
• [Presentation] Spin current switching in an antiferromagnetic insulator (2019)
  • Author(s): Hou Dazhi、Qiu Zhiyong、Barker Joseph、Yamamoto Kei、Gomonay Olena、Saitoh Eiji
  • Organizer: spin mechanics 6
  • Int'l Joint Research / Invited
• [Presentation] Spin colossal magnetoresistance in an antiferromagnetic insulator (2018)
  • Author(s): Hou Dazhi、Qiu Zhiyong、Barker Joseph、Yamamoto Kei、Gomonay Olena、Saitoh Eiji
  • Organizer: Spin Summit 2018
• [Presentation] Spin colossal magnetoresistance in an antiferromagnetic insulator (2018)
  • Author(s): Hou Dazhi、Qiu Zhiyong、Barker Joseph、Yamamoto Kei、Gomonay Olena、Saitoh Eiji
  • Organizer: spin caloritronics IX
• [Presentation] sign change of the spin Hall magnetoresistance in Pt/NiO/YIG (2017)
  • Author(s): Dazhi Hou
  • Organizer: APS 2017, New Orleans, USA
  • Int'l Joint Research
• [Presentation] sign change of the spin Hall magnetoresistance in Pt/NiO/YIG (2017)
  • Author(s): Dazhi Hou
  • Organizer: Young Research Leaders Group Workshop, August 3rd, Mainz, Germany
  • Int'l Joint Research / Invited
• [Presentation] sign change of the spin Hall magnetoresistance in Pt/NiO/YIG (2017)
  • Author(s): Dazhi Hou
  • Organizer: MMM conference 2017, Nov. 10th, Pittsbrugh, USA
  • Int'l Joint Research