Abstract
In this paper, the study of the influence of the matrix structure (mxm) of thin-film, rotation angle (α), magnetic field (B), and size (D) of Fe2O3 nanoparticle on the magnetic characteristic quantities such as the magnetization oriented z-direction (MzE), z-axis magnetization (Mz), total magnetization (Mtot), and total entropy (Stot) of Fe2O3 nanocomposites by Monte-Carlo (MC) simulation method are studied. The applied MC Metropolis code achieves stability very quickly, so that after 30 Monte Carlo steps (MCs), the change of obtained results is negligible, but for certainty, 84 MCs have been performed. The obtained results show that when the mxm and α increase, the magnetic phase transition appears with a very small increase in temperature Néel (TNtot). When B and D increase, TNtot increases very strongly. The results also show that in Fe2O3 thin films, TNtot is always smaller than with Fe2O3 nano and Fe2O3 bulk. When the nanoparticle size is increased to nearly 12 nm, then TNtot = T = 300 K, and between TNtot and D, there is a linear relationship: TNtot = −440.6 + 83D. This is a very useful result that can be applied in magnetic devices and in biomedical applications.
Highlights
Thin films, two-dimensional physical systems with different structures and materials, have been studied for many decades, especially after the discovery of the so-called giant magnetoresistance effect [1,2] and topological phase transitions [3,4]
In this article, we focus on a study of the influence of factors such as material size, magnetic field (B), and nanoparticle size on magnetization in the direction priority z-axis (MzE ), z-axis magnetization (Mz ), total composite magnetization (Mtot ), and total entropy of Fe2 O3 nano synthetic thin films
We studied the magnetic properties of Fe2 O3 nano synthetic thin films by applying a potential force field to the nano synthetic thin film, with the value of the Hamilton function of the form (Equation (1)) [6], and numerical simulation was performed by the Monte-Carlo method
Summary
Two-dimensional physical systems with different structures and materials, have been studied for many decades, especially after the discovery of the so-called giant magnetoresistance effect [1,2] and topological phase transitions [3,4]. Balli et al [75] and Liu et al [76] successfully demonstrated that the Maxwell relationship no longer exists when the material is near the phase transition (paramagnetic phase, ferromagnetic phase, antiferromagnetic) They suggested that the cause of the appearance of the giant magnetic field at room temperature is due to the morphological leading to changes in the magnetic transition temperature at the T~110 K. In this article, we focus on a study of the influence of factors such as material size (mxm), magnetic field (B), and nanoparticle size on magnetization in the direction priority z-axis (MzE ), z-axis magnetization (Mz ), total composite magnetization (Mtot ), and total entropy of Fe2 O3 nano synthetic thin films For this purpose, we used the Monte-Carlo simulation method. The obtained results will serve as a basis for future experimental studies when we try to apply Fe2 O3 nano synthetic thin films to smart devices and refrigeration equipment
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