2014
DOI: 10.1063/1.4861173
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Anomalous behaviour of magnetic coercivity in graphene oxide and reduced graphene oxide

Abstract: In this report we present the temperature evolution of magnetic coercivity of graphene oxide (GO) and reduced graphene oxide (RGO). We report an anamolous decrease in coercivity of GO and RGO with decreasing temperature. We could explain this anamolous behavior invoking the inherent presence of ripple in graphene. We observe antiferromagnetic and ferromagnetic behavior at room temperature for GO and RGO respectively, but at low temperatures both shows paramagnetic behavior.

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Cited by 30 publications
(26 citation statements)
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“…As mentioned, the activated carbon samples exhibit magnetic hysteresis loops at 2 K, with coercivity up to 200 Oe where the coercivity varies with the amount of KOH used for activation (Figure ). This is similar to the previous observation in different carbon‐based systems, ascribed to the blocking of the spins in a disordered carbon structure . A three‐dimensional plot of the coercivity (H c ) of the activated samples, measured at 2 K, against the activation temperature and the KOH/C ratio is shown in Figure .…”
Section: Resultssupporting
confidence: 88%
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“…As mentioned, the activated carbon samples exhibit magnetic hysteresis loops at 2 K, with coercivity up to 200 Oe where the coercivity varies with the amount of KOH used for activation (Figure ). This is similar to the previous observation in different carbon‐based systems, ascribed to the blocking of the spins in a disordered carbon structure . A three‐dimensional plot of the coercivity (H c ) of the activated samples, measured at 2 K, against the activation temperature and the KOH/C ratio is shown in Figure .…”
Section: Resultssupporting
confidence: 88%
“…A three‐dimensional plot of the coercivity (H c ) of the activated samples, measured at 2 K, against the activation temperature and the KOH/C ratio is shown in Figure . The coercivity, which arises due to the blocking of the spins along random directions is known to depend on the microstructure of the materials as well as the magnetic anisotropy . For the activated samples, the coercivity (Figure ) varies in a similar manner as that of the coherence lengths calculated from the XRD data (Figure ).…”
Section: Resultsmentioning
confidence: 78%
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