Issue 36, 2017, Issue in Progress

Wasp-waisted behavior in magnetic hysteresis curves of CoFe2O4 nanopowder at a low temperature: experimental evidence and theoretical approach

Abstract

We theoretically and experimentally investigated wasp-waisted magnetic hysteresis curves at a low temperature for CoFe2O4 nanopowders. Our theoretical approach proposes a physical mechanism that leads to wasp-waisted behavior for a single magnetic phase with the same anisotropic field, contrary to that of typical multi-phase magnetic systems. Our simulations show that a combination of effects, namely easy-plane anisotropy configuration and dipolar interactions, results in a double peak in the magnetic susceptibility curve of a granular magnetic system. As experimental evidence of such an effect, we present a CoFe2O4 nanopowder and its structural and magnetic characterizations, which support a single magnetic phase. In addition, the evidence does not corroborate many explanations reported in the literature for wasp-waisted magnetic behavior. Our results provide evidence for a tetragonal crystalline phase of CoFe2O4 due to magneto-elastic coupling, recently reported in the literature.

Graphical abstract: Wasp-waisted behavior in magnetic hysteresis curves of CoFe2O4 nanopowder at a low temperature: experimental evidence and theoretical approach

Article information

Article type
Paper
Submitted
26 Dec 2016
Accepted
20 Mar 2017
First published
20 Apr 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 22187-22196

Wasp-waisted behavior in magnetic hysteresis curves of CoFe2O4 nanopowder at a low temperature: experimental evidence and theoretical approach

T. Magno de Lima Alves, B. F. Amorim, M. A. Morales Torres, C. G. Bezerra, S. Nóbrega de Medeiros, P. L. Gastelois, L. E. Fernandez Outon and W. Augusto de Almeida Macedo, RSC Adv., 2017, 7, 22187 DOI: 10.1039/C6RA28727A

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