中国物理B ›› 2021, Vol. 30 ›› Issue (9): 97702-097702.doi: 10.1088/1674-1056/abeef1

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Strain-modulated ultrafast magneto-optic dynamics of graphene nanoflakes decorated with transition-metal atoms

Yiming Zhang(张一鸣)1, Jing Liu(刘景)2, Chun Li(李春)1,3,†, Wei Jin(金蔚)4, Georgios Lefkidis2,1, and Wolfgang Hübner2   

  1. 1 School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;
    2 Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, P. O. Box 3049, 67653 Kaiserslautern, Germany;
    3 Department of Mechanical Engineering, University of Manitoba, Winnipeg MB R3T 5V6, Canada;
    4 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China
  • 收稿日期:2020-12-22 修回日期:2021-02-04 接受日期:2021-03-16 出版日期:2021-08-19 发布日期:2021-08-19
  • 通讯作者: Chun Li E-mail:lichun@nwpu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11872309, 12172293, and 11504223), the Natural Science Basic Research Plan in Shaanxi Province, China (Grant No. 2020JM-120), and the Program of China Scholarships Council (Grant No. 201906295029).

Strain-modulated ultrafast magneto-optic dynamics of graphene nanoflakes decorated with transition-metal atoms

Yiming Zhang(张一鸣)1, Jing Liu(刘景)2, Chun Li(李春)1,3,†, Wei Jin(金蔚)4, Georgios Lefkidis2,1, and Wolfgang Hübner2   

  1. 1 School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;
    2 Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, P. O. Box 3049, 67653 Kaiserslautern, Germany;
    3 Department of Mechanical Engineering, University of Manitoba, Winnipeg MB R3T 5V6, Canada;
    4 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China
  • Received:2020-12-22 Revised:2021-02-04 Accepted:2021-03-16 Online:2021-08-19 Published:2021-08-19
  • Contact: Chun Li E-mail:lichun@nwpu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11872309, 12172293, and 11504223), the Natural Science Basic Research Plan in Shaanxi Province, China (Grant No. 2020JM-120), and the Program of China Scholarships Council (Grant No. 201906295029).

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摘要： We perform first-principles calculations and coherent laser-matter interaction analyses to investigate the laser-induced ultrafast spin flip on graphene nanoflakes (GNFs) with transition metal elements attached on the boundary [TM&GNFs (TM=Fe, Co, Ni)]. It is shown that the spin-flip process on TM&GNFs is highly influenced by the involved element species and the position attached to the nanoflakes. Furthermore, taking Ni&GNF as an example, the first-principles tensile test predicts that the variation of the C-Ni bond length plays an important role in the spin density distribution, especially for the low-lying magnetic states, and can therefore dominate the spin-flip processes. The fastest spin-flip scenario is achieved within 80 fs in a Ni&GNF structure under 10% tensile strain along the C-Ni bond. The local deformation modulation of spin flip provides the precursory guidance for further study of ultrafast magnetization control in GNFs, which could lead to potential applications in future integrated straintronic devices.

关键词: graphene nanoflakes, straintronics, spin dynamics, strain effect, first principles

Abstract: We perform first-principles calculations and coherent laser-matter interaction analyses to investigate the laser-induced ultrafast spin flip on graphene nanoflakes (GNFs) with transition metal elements attached on the boundary [TM&GNFs (TM=Fe, Co, Ni)]. It is shown that the spin-flip process on TM&GNFs is highly influenced by the involved element species and the position attached to the nanoflakes. Furthermore, taking Ni&GNF as an example, the first-principles tensile test predicts that the variation of the C-Ni bond length plays an important role in the spin density distribution, especially for the low-lying magnetic states, and can therefore dominate the spin-flip processes. The fastest spin-flip scenario is achieved within 80 fs in a Ni&GNF structure under 10% tensile strain along the C-Ni bond. The local deformation modulation of spin flip provides the precursory guidance for further study of ultrafast magnetization control in GNFs, which could lead to potential applications in future integrated straintronic devices.

Key words: graphene nanoflakes, straintronics, spin dynamics, strain effect, first principles

中图分类号:  (Molecular nanostructures)

  • 81.07.Nb
77.80.bn (Strain and interface effects) 75.78.Jp (Ultrafast magnetization dynamics and switching) 81.07.Nb (Molecular nanostructures) 75.78.Jp (Ultrafast magnetization dynamics and switching)