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Title: Width-Tuned Magnetic Order Oscillation on Zigzag Edges of Honeycomb Nanoribbons

Quantum confinement and interference often generate exotic properties in nanostructures. One recent highlight is the experimental indication of a magnetic phase transition in zigzag-edged graphene nanoribbons at the critical ribbon width of about 7 nm [Magda, G. Z. et al. Nature 2014, 514, 608]. Here in this work, we show theoretically that with further increase in the ribbon width, the magnetic correlation of the two edges can exhibit an intriguing oscillatory behavior between antiferromagnetic and ferromagnetic, driven by acquiring the positive coherence between the two edges to lower the free energy. The oscillation effect is readily tunable in applied magnetic fields. In conclusion, these novel properties suggest new experimental manifestation of the edge magnetic orders in graphene nanoribbons and enhance the hopes of graphene-like spintronic nanodevices functioning at room temperature.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [4] ;  [5]
  1. Nanjing University (China). National Laboratory of Solid State Microstructure, Department of Physics
  2. Nanjing University (China). National Laboratory of Solid State Microstructure, Department of Physics and Collaborative Innovation Center of Advanced Microstructures; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department
  3. Nanjing University (China). National Laboratory of Solid State Microstructure, Department of Physics and Collaborative Innovation Center of Advanced Microstructures
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department
  5. Zhejiang Normal University (China). Center for Statistical and Theoretical Condensed Matter Physics; Nanjing University (China). National Laboratory of Solid State Microstructure, Department of Physics
Publication Date:
Report Number(s):
BNL-114073-2017-JA
Journal ID: ISSN 1530-6984; R&D Project: PO015; KC0202030
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 17; Journal Issue: 7; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; edge magnetism; Friedel oscillation; Graphene; metal−insulator transition; nanoribbon
OSTI Identifier:
1376136