Anamolous reduction of magnetic coercivity of graphene oxide and reduced graphene oxide upon cooling

TL;DR

This study investigates the unusual decrease in magnetic coercivity of graphene oxide and reduced graphene oxide as temperature drops, attributing it to inherent ripples in graphene and observing magnetic behavior changes.

Contribution

It reveals the anomalous temperature-dependent coercivity behavior in GO and RGO and links it to graphene ripples, providing new insights into their magnetic properties.

Findings

Coercivity decreases anomalously with decreasing temperature

GO shows antiferromagnetic behavior at room temperature

RGO exhibits ferromagnetic behavior at room temperature

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.