Thermomagnetic Properties of Metal and Metal-oxide Nanoparticles

Thermomagnetic Properties of Metal and Metal-oxide Nanoparticles

Ratan Lal Jaiswal1, Brijesh Kumar Pandey2,*

1Department of Physics, Government Degree College, Dhadha Bujurg, Hata, Kushinagar 274207

2Department of Physics & Material Science, MMM University of Technology, Gorakhpur 273010, India

Adv. Mater. Lett., 2021, 12 (7), 21071647

DOI: 10.5185/amlett.2021.071647

Publication Date (Web): Jun 12, 2021

E-mail: bkpmmmec11@gmail.com

Abstract


Variation of thermomagnetic properties of nanoparticles are the matter of great debate. To develop a suitable model for the study of magnetic properties, the size and shape dependent magnetic properties such as Curie temperature (TC), Neel temperature (TN) and magnetization (MS) of magnetic nanoparticles (Fe, Ni, Co, Fe3O4, NiO, CoO, CuO, Ho and CoFe2O4) have been studied. In the present work, bond energy model has been used with the concept of dangling bond and its effect on the surface of nanoparticles. It is observed that the introduction of packing fraction of materials to this model supports the experimental facts. The obtained results have been explained by considering the concept of dangling bond at the surface of nanoparticle and packing fraction of crystal. It is observed that these magnetic properties decrease with reducing size of nanoparticles and the available experimental data are in good agreement with present theoretical model. The validity of present model encourages us to predict the behaviour of thermomagnetic properties of other nanoparticles.

Keywords

Cohesive energy, curie temperature, neel temperature, shape factor, dangling bond.

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