Graphene oxide and its derivatives as potential Ovchinnikov ferromagnets. (9th July 2021)

• Record Type: Journal Article
• Authors: Sinha, Apurva; Ranjan, Pranay; Ali, Anzar; Balakrishnan, Jayakumar; Thakur, Ajay D
• Is Part Of: Journal of physics. Volume 33:Number 37(2021)
• Publication Date: 2021-07-09
• Subjects: graphene oxide -- reduced graphene oxide -- Ovchinnikov ferromagnet -- magnetism; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac0d84
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Ovchinnikov postulated the possibility of ferromagnetism in organic compounds having a mixed density of sp 3 and sp 2 carbon atoms. Such systems provide an interesting avenue for exploring magnetism in the absence of the quintessential d - and f -block elements as ingredients. As graphene oxide (GO) and its derivatives naturally possess a mixture of sp 3 and sp 2 carbon atoms, it is pertinent to look at them as potential candidates for Ovchinnikov ferromagnetism. We have looked at the evolution of magnetic property in a series of GO samples with a gradual increase in the degree of oxidation and hence the sp 3 / sp 2 fraction. Starting with a GO sample with a high sp 3 / sp 2 ratio, we utilize chemical reduction technique to prepare another set of reduced graphene oxide (rGO) samples. Magnetization measurements on these samples further illustrate the importance of sp 3 / sp 2 fraction on magnetic behavior suggesting GO and its derivatives as a potential Ovchinnikov ferromagnet candidate. The evolution of magnetic moment with sp 3 / sp 2 carbons can be utilized in carbon based spintronic applications.