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

作　　者：Yiming Zhang Jing Liu Chun Li Wei Jin Georgios Lefkidis Wolfgang Hubner 张一鸣;刘景;李春;金蔚;Georgios Lefkidis;Wolfgang Hubner(School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi'an 710072,China;Department of Physics and Research Center OPTIMAS,Technische Universität Kaiserslautern,P.O.Box 3049,67653 Kaiserslautern,Germany;Department of Mechanical Engineering,University of Manitoba,Winnipeg MB R3T 5V6,Canada;School of Physics and Information Technology,Shaanxi Normal University,Xi'an 710119,China)

机构地区：[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

出　　处：《Chinese Physics B》2021年第9期520-527,共8页中国物理B（英文版）

基　　金：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);the Program of China Scholarships Council(Grant No.201906295029).

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 

分 类 号：O469[理学—凝聚态物理] TQ127.11[理学—电子物理学] TB383.1[理学—物理]