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2018 年度 実績報告書

Antiferromagnetic Skyrmions

研究課題

研究課題/領域番号 17K05511
研究機関東北大学

研究代表者

Tretiakov Oleg  東北大学, 金属材料研究所, 助教 (50643425)

研究期間 (年度) 2017-04-01 – 2019-03-31
キーワードAntiferromagnets / Skyrmions
研究実績の概要

We demonstrated that the nontrivial magnetic texture of antiferromagnetic Skyrmions promotes a nonvanishing topological spin Hall effect on the flowing electrons. This effect results in a substantial enhancement of the nonadiabatic torque and, hence, improves the Skyrmion mobility [Phys. Rev. Lett. 121, 097204 (2018)]. Furthermore, we identified the dynamics of the antiferromagnetic skyrmion induced by a magnetic anisotropy gradient [Phys. Rev. B 98, 134448 (2018)]. We also showed that skyrmion-based spin torque nano-oscillators are potential next-generation microwave signal generators. We proposed to use the circular motion of an antiferromagnetic skyrmion to create an oscillation signal to overcome this obstacle. Furthermore, the speed of the circular motion for an antiferromagnetic skyrmion in a nanodisk was analytically derived and agreed well with simulations [Appl. Phys. Lett. 114, 042402 (2019)].

Micromagnetic simulations for skyrmions and domain walls in the system with Dzyaloshinskii-Moriya interaction were performed and an analytical theory for domain wall motion resulted in Phys. Rev. B 99, 060407(R) (2019). We studied the structure and dynamics of magnetic domains in synthetic antiferromagnets based on Co/Ru/Co films. We have shown that dramatic effects arise from the interaction among the topological defects comprising the dual domain walls in these structures. These features allowed us to work on the enhanced control of domain-wall motion in synthetic antiferromagnets with the potential for future devices [Sci. Rep. 8, 15794 (2018)].

  • 研究成果

    (10件)

すべて 2019 2018

すべて 雑誌論文 (5件) (うち国際共著 5件、 査読あり 5件、 オープンアクセス 1件) 学会発表 (5件) (うち国際学会 4件、 招待講演 5件)

  • [雑誌論文] Spin Torque Nano-oscillators Based on Antiferromagnetic Skyrmions2019

    • 著者名/発表者名
      L. Shen, J. Xia, G. Zhao, X. Zhang, M. Ezawa, Oleg A. Tretiakov, X. Liu, and Y. Zhou
    • 雑誌名

      Applied Physics Letters

      巻: 114 ページ: 042402-1-5

    • DOI

      10.1063/1.5080302

    • 査読あり / 国際共著
  • [雑誌論文] Magnetic bimerons as skyrmion analogues in in-plane magnets2019

    • 著者名/発表者名
      B. Gobel, A. Mook, J. Henk, I. Mertig, and Oleg A. Tretiakov
    • 雑誌名

      Physical Review B

      巻: 99 ページ: 060407(R)-1-5

    • DOI

      10.1103/PhysRevB.99.060407

    • 査読あり / 国際共著
  • [雑誌論文] Composite topological structure of domain walls in synthetic antiferromagnets2018

    • 著者名/発表者名
      G. Kolesnikov, V. S. Plotnikov, E. V. Pustovalov, A. S. Samardak, L. A. Chebotkevich, A. V. Ognev, and Oleg A. Tretiakov
    • 雑誌名

      Scientific Reports

      巻: 8 ページ: 15794-1-8

    • DOI

      10.1038/s41598-018-33780-6

    • 査読あり / オープンアクセス / 国際共著
  • [雑誌論文] Theory of the Topological Spin Hall Effect in Antiferromagnetic Skyrmions: Impact on Current-Induced Motion2018

    • 著者名/発表者名
      C. A. Akosa, Oleg A. Tretiakov, G. Tatara, and A. Manchon
    • 雑誌名

      Physical Review Letters

      巻: 121 ページ: 097204-1-5

    • DOI

      10.1103/PhysRevLett.121.097204

    • 査読あり / 国際共著
  • [雑誌論文] Dynamics of Antiferromagnetic Skyrmion Induced by a Magnetic Anisotropy Gradient2018

    • 著者名/発表者名
      L. Shen, J. Xia, G. Zhao, X. Zhang, M. Ezawa, Oleg A. Tretiakov, X. Liu, and Y. Zhou
    • 雑誌名

      Physical Review B

      巻: 98 ページ: 134448-1-7

    • DOI

      10.1103/PhysRevB.98.134448

    • 査読あり / 国際共著
  • [学会発表] Dynamics and Lifetimes of (Anti)Skyrmions2019

    • 著者名/発表者名
      Oleg A. Tretiakov
    • 学会等名
      9th International Conference on Advanced Materials and Nanotechnology (AMN9), Wellington, New Zealand
    • 国際学会 / 招待講演
  • [学会発表] Skyrmionics with Antiferromagnets2018

    • 著者名/発表者名
      Oleg A. Tretiakov
    • 学会等名
      2018 MRS Fall Meeting, Boston, USA
    • 国際学会 / 招待講演
  • [学会発表] Stability and Spin-transfer/Spin-orbit Torque Driven Dynamics of Antiskyrmions2018

    • 著者名/発表者名
      Oleg A. Tretiakov
    • 学会等名
      2018 “Collective Spin Dynamics in Nanostructures” International Workshop, KITS, Beijing, China
    • 招待講演
  • [学会発表] Antiferromagnetic Skyrmionics2018

    • 著者名/発表者名
      Oleg A. Tretiakov
    • 学会等名
      28th JIWON Conference, Korea University, Seoul, South Korea
    • 国際学会 / 招待講演
  • [学会発表] Skyrmionics in Ferromagnets and Antiferromagnets2018

    • 著者名/発表者名
      Oleg A. Tretiakov
    • 学会等名
      Fourth ASCO-NANOMAT 2018 Conference, Vladivostok, Russia
    • 国際学会 / 招待講演

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公開日: 2019-12-27  

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