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Spin glass like transition and the exchange bias effect in Co3O4 nanoparticles anchored onto graphene sheets

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Abstract

We have synthesized Co3O4 nanoparticles having 40 nm average size, which are anchored on reduced graphene oxide. X-ray diffraction, FESEM, TEM and Raman spectroscopy are performed for the characterization. The temperature dependence of field cooled (FC) and zero field cooled (ZFC) magnetization curves exhibits antiferromagnetic (AFM) transition around ∼30 K, as observed for bulk Co3O4. The exchange bias effect is observed below ∼30 K. A significant change in the exchange bias effect is noted around ∼8 K, which is close to a spin-glass-like transition. The spin-glass-like phase has been confirmed by the memory effects observed by different experimental protocols. The possible origin of exchange bias is discussed in the manuscript.

Graphical abstract: Spin glass like transition and the exchange bias effect in Co3O4 nanoparticles anchored onto graphene sheets

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Publication details

The article was received on 26 Oct 2018, accepted on 26 Nov 2018 and first published on 27 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP06659K
Citation: Phys. Chem. Chem. Phys., 2019, Advance Article
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    Spin glass like transition and the exchange bias effect in Co3O4 nanoparticles anchored onto graphene sheets

    S. Sarkar, A. Mondal, N. Giri and R. Ray, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C8CP06659K

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