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Hadey K. Mohamad
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Medicine & Pharmacology

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Ferrimagnetism in the Mean-field Approximation of a Mixed Spin Ising Nanowire System Hadey K. Mohamad
Journal of Global Pharma Technology Volume 12 Issue 01
Publisher : Journal of Global Pharma Technology

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Abstract

A ferrimagnetic mixed spin square Blume-Capel Ising nanowire system consists of spin-1 core and spin-3/2 outer shell has been investigated. The general formula for the temperature dependence of the equilibrium magnetization of the system is presented. The ferrimagnetic core-shell nanosystem shows a compensation point when the exchange interactions are changed at various values of the single-ion anisotropies of shell sublattices and core ones, respectively. So, one can examine interesting phenomena are compensation behaviors and the free energy of the nanosystem, where these phenomena found that the mixed-spin square Blume-Capel Ising nanosystem which is being considered has two spin compensation temperatures in the range of ,  when , for two different values of core anisotropy for sublattices of atoms A, , and , respectively.
Spin Compensation Temperatures in the Mean-field Theory of a Mixed Spin-3/2 and Spin-7/2 Blume-Capel Ising Model Hadey K. Mohamad
Journal of Global Pharma Technology Volume 11 Issue 07
Publisher : Journal of Global Pharma Technology

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Abstract

In this research it has been constructed the ground-state phase diagram of a mixed spin-3/2 and spin-7/2 Blume-Capel Ising system on a square lattice in theplane. Magnetic phase transitions, in a molecular based magnet, are tested using mean field method (MFM). The equilibrium magnetizations can be achieved by minimizing the free energy which is vital for locating and spin compensation points as well. By utilizing mean field theory (MFT) on principles of Bogoliubov inequality of the free energy, it has been investigated the spin compensation phenomena. In particular, characteristic ferrimagnetic features have been shown depending on the negative values of the different single-ion anisotropies, acting on the atoms and atoms, respectively.Keywords: Blume-Capel Ising model; Ground-state phase diagram; Compensation temperature; Magnetic free energy.
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