4.6 Article

Observation of the predicted potential barrier at the graphene/transition metal interface

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 49, Issue 13, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/49/13/135304

Keywords

charge transfer; potential barrier; cut-in voltage; graphene; transition metal

Funding

  1. DST, New Delhi
  2. CSIR
  3. DST, New Delhi, the Government of India [SR/NM/NS-1089/2011]

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To verify the prediction of a potential barrier (similar to 0.4 eV) as a result of charge transfer from a transition metal (TM) to graphene at the graphene/TM interface, in the present work Fe atoms are intercalated in between the few-layer graphene. A diode-like behavior with cut-in voltage (0.41 V-0.65 V) and rectification ratio 11 at 1.7 V is observed depending on the Fe concentration. The cut-in voltage decreases with an increase in both temperature and magnetic field because of better charge sharing across the covalent bond formed between Fe and graphene. This tuning of charge sharing under a magnetic field exhibits a remarkable effect of the magneto-dielectric property with a 2597% change in dielectric permittivity at 1.8 T. We believe that the material exhibiting diode-like behavior with a large rectification ratio and a giant magneto-dielectric effect has potential applications in magneto-electronic devices.

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