By: Gizachew Diga Milki
Dilute magnetic semiconductors are attractive area of specialty in semiconductor technology, material engineering, and condensed matter system. The model employed to manipulate the Hamiltonian of the system is the Heisenberg Model. By considering, a cloud of electron gas and employing equation of state the fractions of demagnetization factors was determined. Besides, the thermodynamic relation between magnetization and temperature is determined by analyzing the Helmholtz free energy. In this research some of the peculiar properties of diluted magnetic semiconductors most reviewed. Most importantly the ferromagnetic resonance is studied for medical imaging applications. For FMR probes, the sample magnetization results from the magnetic moments of dipolar-coupled but unpaired electrons. The relation between magnetization and magnetic flux density will be described by tuning magnetization, M to zero and then increasing it gradually. The resulting frequency versus magnetization curve is downward parabolic curves, resembling Gaussian distribution function which is sharper at tips. The side width sharpening is due to ferromagnetic spin confinement with increasing magnetic ion Mn2+ concentration. The basic parameters ascribing the resulting ferromagnetic resonance condition is investigated. By using the 3D exchange interaction model, the value of demagnetization factor that contribute to the formation of magnetization Peaks (0.1 & 0.9) is then determined. Furthermore, the angular dependence of ferromagnetic absorption frequency is investigated. It is expected that the ferromagnetic absorption frequency is directly proportional to the magnetic flux density, B. From ferromagnetic resonance studies, the nature of magnetic property is studied in Zn1−xMnxO and ZnxFe2-xO3 nanoparticles. This property enables leveraging the significance of ZnxFe2-xO3 and Zn1-xMnxO nanoparticles in AI enhanced magnetic resonance imaging and immunotherapy.
Keywords: Ferromagnetic resonance, flux density, medical imaging, demagnetization factors, resonance frequency
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