Regulation of growth temperature on structure, magnetism of epitaxial FeCo<sub>2</sub>O<sub>4</sub> films

The high-quality inverse spinel CuCo2O4 thin films are epitaxially grown on (001) MgAl2O4 substrates by radio frequency magnetron sputtering. The electrical transport properties exhibit typical semiconducting characteristics, accompanying the enhancement of resistivity with the thinning of CuCo2O4 thickness. The transport properties could be well understood by the Mott variable range hopping model. The anomalous Hall effect with a clear hysteresis loop is observed below 100 K, indicating the existence of out-of-plane magnetization in the epitaxial-grown CuCo2O4 films. In addition, the negative magnetoresistance at low temperature reverses to the positive magnetoresistance (≥100 K), which is related to the changes from the decrease in spin/carrier scattering under the magnetic field at low temperature to the enhancement of carrier deflection due to the conventional Lorenz force (≥100 K). The observed physical properties are closely related to the orbital occupation of Cu ion in CuCo2O4 films, which is a significant difference compared to that of documented metallic NiCo2O4. This work is a good comprehensive study of inverse spinel oxide thin films.

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Octahedron-Shaped Nano FeCo2O4 Phase Materials: Wet Chemical Synthesis and Characterization Studies

Balamurugan

Giribha

Ashika

2023

CNM

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Background: Amongst the different spinel cobaltites investigated to date, the FeCo2O4 phase has been relatively less studied in detail despite the potential applications in several areas. As the nanostructured spinels are sensitive to the processing conditions, we have extended our research interest in FeCo2O4 phase materials. Objective: (i)To synthesize the FeCo2O4 nanomaterials by different approaches using different precursors and (ii) To investigate the structural, thermal, optical, and micro-structural properties of different materials by various characterization techniques. Methods: Different approaches such as hexamine-assisted combustion synthesis, co-precipitation, and solvothermal methods were employed to obtain FeCo2O4 nanomaterials using different precursors. Results: The XRD pattern of the as-prepared product of the solvothermal method is significantly different from other processed as-prepared products. The annealed FeCo2O4 materials obtained by co-precipitation using nitrates and/or chlorides showed nearly a single phase of FeCo2O4 nanomaterials. Conclusion: The phase formation of FeCo2O4 materials is sensitive to the presently employed synthesis conditions. The XRD patterns confirmed the deficient crystalline nature of the as-prepared materials produced by sol-gel combustion and co-precipitation methods. The annealed materials obtained by the co-precipitation using nitrates and chlorides showed nearly a singleFeCo2O4 phase. The observed particle sizes of the FeCo2O4 phase materials are octahedral shaped with different sizes of 89 to 344 nm. The optical property studied using the FT-IR technique shows IR bands at 500 ~ 630 cm-1.

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Regulation of growth temperature on structure, magnetism of epitaxial FeCo₂O₄ films

Abstract: Epitaxial FeCo2O4 films were grown by pulsed laser deposition on Al2O3 (0001) substrates at different growth temperatures in this work.

Cited by 3 publications

References 48 publications

Sol–gel combustion derived novel ternary transition metal boride-anisotropic magnetic powders and their magnetic property

Sol–gel combustion derived novel ternary transition metal boride-anisotropic magnetic powders and their magnetic property

The anomalous Hall effect in the epitaxial-grown semiconducting CuCo2O4 thin film

Octahedron-Shaped Nano FeCo2O4 Phase Materials: Wet Chemical Synthesis and Characterization Studies

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Regulation of growth temperature on structure, magnetism of epitaxial FeCo2O4 films

Abstract: Epitaxial FeCo2O4 films were grown by pulsed laser deposition on Al2O3 (0001) substrates at different growth temperatures in this work.

Cited by 3 publications

References 48 publications

Sol–gel combustion derived novel ternary transition metal boride-anisotropic magnetic powders and their magnetic property

Sol–gel combustion derived novel ternary transition metal boride-anisotropic magnetic powders and their magnetic property

The anomalous Hall effect in the epitaxial-grown semiconducting CuCo2O4 thin film

Octahedron-Shaped Nano FeCo2O4 Phase Materials: Wet Chemical Synthesis and Characterization Studies

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Regulation of growth temperature on structure, magnetism of epitaxial FeCo₂O₄ films