Issue 1, 2019

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

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

Article information

Article type
Paper
Submitted
26 Oct 2018
Accepted
26 Nov 2018
First published
27 Nov 2018

Phys. Chem. Chem. Phys., 2019,21, 260-267

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, 21, 260 DOI: 10.1039/C8CP06659K

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