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10. Chemical synthesis and magnetic properties of monodisperse cobalt ferrite nanoparticles

Author

Mahhouti, Z., Moussaoui, H. El, Mahfoud, T., Hamedoun, M., Marssi, M. El, Lahmar, A., Kenz, A. El, and Benyoussef, A.

Subjects
Condensed Matter - Materials Science
Abstract

In this work, a successful synthesis of magnetic cobalt ferrite (CoFe2O4) nanoparticles is presented. The synthesized CoFe2O4 nanoparticles have a spherical shape and highly monodisperse in the selected solvent. The effect of different reaction conditions such as temperature, reaction time and varying capping agents on the phase and morphology is studied. Scanning transmission electron microscopy showed that the size of these nanoparticles can be controlled by varying reaction conditions. Both X-ray diffraction and energy dispersive X-ray spectroscopy corroborate the formation of CoFe2O4 spinel structure with cubic symmetry. Due to optimized reaction parameters, each nanoparticle was shown to be a single magnetic domain with diameter ranges from 6 to 16 nm. Finally, the magnetic investigations showed that the obtained nanoparticles are superparamagnetic with a small coercivity value of about 315 Oe and a saturation magnetization of 58 emu/g at room temperature. These results make the cobalt ferrite nanoparticles promising for advanced magnetic nanodevices and biomagnetic applications., Comment: 10 pages, 9 figures

Published
2019
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28. Martensitic Transition and Electronic, Magnetic, Thermal, and Thermoelectric Properties of Metallic Ferromagnetism Ni2Mn1-xGa1-yFex+y Shape Memory Alloys: Ab Initio Calculations.

Author

Raïâ, M. Y., Masrour, R., Hamedoun, M., Kharbach, J., Rezzouk, A., Benzakour, N., and Bouslykhane, K.

Subjects
SHAPE memory alloys, THERMOELECTRIC materials, AB-initio calculations, IRON-manganese alloys, MANGANESE alloys, THERMOELECTRIC apparatus & appliances, FERROMAGNETISM
Abstract

Based on the first-principles approach, we have studied the martensitic, electronic, magnetic, thermal, and thermoelectric properties of Ni2Mn1-xGa1-yFex+y. The substitution of Fe for Ga in Ni2MnGa compound makes the magnetic moment. Debye temperature and heat capacity are sensitive to the doping of Fe atom. The computed transport parameters are evaluated and influenced by the substitution on Mn and/or Ga sites. The slight reduction of both the total magnetic and the thermal expansion coefficient of systems is observed in the case of diminution Mn concentration. Regard with the phase stability, the Fe-doped Ni2MnGa on Mn and/or Ga sites reduces the stability of austenite which transformed to the martensitic phase. The thermoelectric parameters are computed for a temperature range of 200–900 K intended to check the potential of these alloys for applications in thermoelectric devices. The doping on Ni2MnGa with transition metals could be an effective strategy to tuning c/a ratio of the martensite phase. [ABSTRACT FROM AUTHOR]

Published
2024
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