Jump to main content
Jump to site search


Exchange-Biased Hybrid γ-Fe2O3/NiO Core-Shell Nanostructures: Three-Step Synthesis, Microstructure, and Magnetic Properties

Abstract

Two-step solvothermal method combining a calcination process was conducted to synthesize γ-Fe2O3/NiO core-shell nanostructures with controlled microstructure. The formation mechanism of this binary system has been discussed, and the influences of microstructures on magnetic properties have been analyzed in detail. The microstructural characterizations reveal that the NiO shells consisted of many irregular nanosheets with disordered orientations and monocrystalline structures, packed on the surface of γ-Fe2O3 microspheres. Both grain size and NiO content of nanostructures increase with calcination temperature rising from 300°C to 400°C, accompanied by an enhancement of the compactness of NiO shells. Magnetic investigations indicate that their magnetic properties are determined by four factors: size effect, NiO phase content, interface microstructure, i.e. contact mode, area, roughness and compactness, as well as FM-AFM (where FM and AFM denote the ferromagnetic γ-Fe2O3 and the antiferromagnetic NiO components, respectively) coupling effect. At 5 K, the γ-Fe2O3/NiO core-shell nanostructures display certain exchange bias (HE = 60 Oe) and enhanced coercivity (HC = 213 Oe).

Back to tab navigation

Supplementary files

Publication details

The article was received on 05 Mar 2019, accepted on 07 May 2019 and first published on 08 May 2019


Article type: Paper
DOI: 10.1039/C9CP01265F
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

  •   Request permissions

    Exchange-Biased Hybrid γ-Fe2O3/NiO Core-Shell Nanostructures: Three-Step Synthesis, Microstructure, and Magnetic Properties

    X. He, C. Zhang, F. Guo, S. Yan, Y. Li, L. Liu, H. Zhang, Y. Du and W. Zhong, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP01265F

Search articles by author

Spotlight

Advertisements