Computational Materials & Modelling
Alemu Gurmessa Gindaba; Menberu Mengesha Woldemariam; Senbeto Kena Etena; Elangovan Sampandam
Abstract
The main interest of this study is to investigate the correlation of thermo-magnetic properties with respect to each other on the basis of confinement potential strength, external magnetic field, and temperature dependence. Analytically calculated the bound state energy of the harmonic oscillatory potential ...
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The main interest of this study is to investigate the correlation of thermo-magnetic properties with respect to each other on the basis of confinement potential strength, external magnetic field, and temperature dependence. Analytically calculated the bound state energy of the harmonic oscillatory potential using Nikiforov-Uvarov formalism and numerically calculated the characteristic function of the thermodynamic properties partition function, entropy, and free energy with statistical quantum mechanics extending into the harmonic oscillator potential: Many comprehensive studies from the theoretical point of view were conducted on magneto-thermodynamic properties, but all in all, they did not place emphasis on the functional dependence of the correlation between magneto-thermal properties and their impact on the behavior of a system. Therefore, the correlation of dependent functional characteristics was not investigated. We were inspired to solve the interrelation-dependent magnetic-thermal quantities dependent on the external magnetic field, confinement potential, and temperature. We divulged comprehensive information about the system to put together this guide for the analysis and interpretation of the interrelation. Taking into consideration free energy as a functional center of magnetic and thermodynamic properties, we calculated and graphically simulated the interrelation of free energy, magnetic susceptibility, and magnetization. The nonlinear correlation of free energy and susceptibility at sufficiently low confinement potential strength determines the minimum value of free energy and the maximum value of magnetic susceptibility exhibited. As confinement increases, magnetization linearly decreases. In cases of sufficiently high confinement potential and temperature, the shortest curve of magnetic response is displayed.
Slawomir M. Kaczmarek; Tomasz Bodziony; Vinh H. Tran; Pawal Figiel; Anna Biedunkiewicz; Grzegorz Leniec
Abstract
Series of nanocrystalline and TiC, TiB2, and B4C powders as dopants (3%-20%) embedded in an AISI 316L austenitic steel have been prepared and investigated by ferromagnetic resonance and magnetic measurements. The homogeneous composites with the dopants up to x = 7 vol. % exhibit superparamagnetic properties, ...
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Series of nanocrystalline and TiC, TiB2, and B4C powders as dopants (3%-20%) embedded in an AISI 316L austenitic steel have been prepared and investigated by ferromagnetic resonance and magnetic measurements. The homogeneous composites with the dopants up to x = 7 vol. % exhibit superparamagnetic properties, characterized by bifurcation between the field-cooled MFC(T) and zero-field cooled MZFC(T) magnetization below Tir and a maximum at Tmax in low-field MZFC(T) curves. We found that the Tir and Tmax values depend proportionally on the dopant concentrations x. The magnetization measurements in fields above 1000 Oe suggested an induced phase transition from superparamagnetic state to ferromagnetic one but presumably without long-range magnetic correlation. An analysis of magnetic anisotropic energy barrier distributions implied that different sizes and compositional types of dopants may contribute to the superparamagnetic relaxation process. The results demonstrate the possibility of obtaining new steel-based materials with desired properties and potential applications as combining magnetic and mechanical advantages.
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