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oai:docta.ucm.es:20.500.14352/355442026-04-28T09:04:31Zcom_20.500.14352_14col_20.500.14352_15

Magneto-resistive coefficient enhancement observed around Verwey-like transition on spinel ferrites XFe₂O₄ (X = Mn, Zn) Lopez Maldonado, K. L. Vazquez Zubiate, L. Presa Muñoz De Toro, Patricia Marcela De La Matutes Aquino, J. A. Elizalde Galindo, J. T. Manganese and Zinc ferrites were prepared by solid state reaction. The resulting powders were pressed into pellets and heat treated at 1100 ⁰C. The samples were characterized by using X-ray diffraction, pure phases of zinc ferrite (ZnFe²O₄) and manganese ferrite (MnFe₂O₄) were obtained. Scanning electron microscopy images showed a good contact between particles. A drop of electrical resistance was found in both samples, MnFe₂O₄ and ZnFe₂O₄, with values going from 2750 to 130 Ω and from 1100 to 55 Ω, respectively. Transition temperatures were determined to be Tv = 225 K for MnFe₂O₄ and Tv = 130 K for ZnFe₂O₄. Magnetoresistance measurements were carried out in the temperature range where R showed the transition, defined as the Verwey-like transition temperature range, ∆Tv. No magnetoresistive effect was observed out of it. The magnetoresistive coefficient (MRC) observed at ∆Tv reached its maximum values of 1.1% for MnFe₂O₄ and 6.68% for ZnFe₂O₄. The differences between MRC values are related to the divalent metal element used. Finally, the magnetoresistive response indicates that the electrical transition observed is strongly influencing the magnetoresistance; where the underlying responsible for this behavior could be a charge reordering occurring at the Verwey-like transition temperature. 2023-06-19T15:12:31Z 2023-06-19T15:12:31Z 2023-06-19T15:12:31Z 2014-05-07 journal article https://hdl.handle.net/20.500.14352/35544 0021-8979 10.1063/1.4857615 eng López Maldonado, K. L., et al. «Magneto-Resistive Coefficient Enhancement Observed around Verwey-like Transition on Spinel Ferrites XFe2O4 (X = Mn, Zn)». Journal of Applied Physics, vol. 115, n.o 17, mayo de 2014, p. 17C705. DOI.org (Crossref), https://doi.org/10.1063/1.4857615 open access American Institute of Physics