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Title: Anomalous behaviour of magnetic coercivity in graphene oxide and reduced graphene oxide

In this report, we present the temperature dependence of the magnetic coercivity of graphene oxide (GO) and reduced graphene oxide (RGO). We observe an anomalous decrease in coercivity of GO and RGO with decreasing temperature. The observation could be understood by invoking the inherent presence of wrinkles on graphene oxide due to presence of oxygen containing groups. Scanning electron microscopic image reveals high wrinkles in GO than RGO. We observe higher coercivity in RGO than in GO. At room temperature, we observe antiferromagnetic and ferromagnetic behaviours in GO and RGO, respectively. Whereas, at low temperatures (below T = 60–70 K), both materials show paramagnetic behaviour.
Authors:
; ; ; ; ;  [1] ;  [2]
  1. Saha Institute of Nuclear Physics, Surface Physics Division, 1/AF Bidhannagar, Kolkata 700064 (India)
  2. Material Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)
Publication Date:
OSTI Identifier:
22271266
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; CARBON OXIDES; COERCIVE FORCE; GRAPHENE; PARAMAGNETISM; SCANNING ELECTRON MICROSCOPY; TEMPERATURE DEPENDENCE