Co3O4-γ-Fe2O3 Nanocrystal Heterostructures with Enhanced Coercivity and Blocking Temperature

Nethravathi C, Rajamathi CR, Caron L, Kalache A, Machado J, Rajamathi M, Felser C (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Journal of Physical Chemistry C American Chemical Society

Book Volume: 124

Pages Range: 1623-1630

Journal Issue: 2

DOI: 10.1021/acs.jpcc.9b10858

Abstract

Reassembly of α-cobalt hydroxide nanosheets in the presence of citrate-capped γ-Fe2O3 nanoparticles yields α-cobalt hydroxide-γ-Fe2O3 hybrid in which the nanoparticles are trapped between the nanosheets. Thermal decomposition of the hybrid yields the Co3O4-γ-Fe2O3 heterostructure. While the saturation magnetization (Ms) of γ-Fe2O3 is preserved in the Co3O4-γ-Fe2O3 heterostructure, the interface between the oxides in the heterostructure enhances the coercive field (HC) to a large extent. The coercivity persists even above the Néel temperature of Co3O4 with the blocking temperature increased beyond room temperature. The unique morphology of the heterostructure wherein the Co3O4 and γ-Fe2O3 particles are fused together to form a larger network leading to strong interparticle interactions, diffusion of Co atoms into the surface of γ-Fe2O3 particles, and strain at the interfaces appear to be the reasons behind the improved magnetic behavior.

Involved external institutions

St. Joseph's College Autonomous IN India (IN) Max-Planck-Institut für Chemische Energiekonversion (MPI CEC) / Max-Planck-Institute for Chemical Energy Conversion DE Germany (DE) Universität Bielefeld DE Germany (DE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE)

How to cite

APA:

Nethravathi, C., Rajamathi, C.R., Caron, L., Kalache, A., Machado, J., Rajamathi, M., & Felser, C. (2020). Co3O4-γ-Fe2O3 Nanocrystal Heterostructures with Enhanced Coercivity and Blocking Temperature. Journal of Physical Chemistry C, 124(2), 1623-1630. https://doi.org/10.1021/acs.jpcc.9b10858

MLA:

Nethravathi, C., et al. "Co3O4-γ-Fe2O3 Nanocrystal Heterostructures with Enhanced Coercivity and Blocking Temperature." Journal of Physical Chemistry C 124.2 (2020): 1623-1630.

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