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Showing 1 to 20 of 24 for “"Magnetic semiconductors"”.
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Zinc Oxide based Diluted Magnetic Semiconductors
… I have synthesized materials known as diluted magnetic semiconductors (DMS) as epitaxial thin film structures using the process of pulsed laser deposition (PLD). These materials are envisioned to be of importance in the emerging field of spintronics where the charge as well as the spin of the …
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Ab-initio calculations for dilute magnetic semiconductors
… for the electronic structure and the magnetic properties of dilute magnetic semiconductors (DMS). In particular we aim at the understanding of the complex exchange interactions in these systems. Our calculations are based on density functional theory, being ideally suited for a …
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Ferromagnetism and transport in diluted magnetic semiconductors
… focuses on the study of ferromagnetism in Dilute Magnetic Semiconductors. To study these strongly correlated electronic systems, two non- perturbative techniques are used: the Dynamical Mean Field Approximation (DMFA) and the Dynamical Cluster Approximation (DCA). The model used for Dilute …
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Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors
… study of photo-induced ferro-magnetism in dilute magnetic semiconductors. When light is incident on these systems, electrons and holes are created across the band gap. These particles interact with the impurity magnetic moments and mediate ferro-magnetism when temperature is lowered. This is a …
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Developing spectroscopic ellipsometry to study II-VI and diluted magnetic semiconductors
… ellipsometer (RAE) to study effects of magnetic and nonmagnetic doping on the £1 and £1 + .11 band gap energies in ZnSe-based II-VI semiconductors. To remove the natural surface oxide overlayer which distorts the intrinsic dielectric response of the sample, a chemical etching technique …
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New models of magnetic interactions for bound magnetic polarons in dilute magnetic semiconductors
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1990
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Electrical gating effects on the magnetic properties of (Ga,Mn)As diluted magnetic semiconductors
… the effects of electrostatic gating on the magnetic properties of carrier-mediated ferromagnetic Ga1−xMnxAs diluted magnetic semiconductors. (Ga,Mn)As can be regarded as a prototype material because of its strong spin-orbit coupling and its crystalline properties which can be described …
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Understanding and Controlling the Magnetic and Optical Properties in van der Waals Semiconductors
… (2D) materials, 2D van der Waals (vdW) magnetic semiconductors are distinguished by their novel properties, which stem from the weak yet tunable interlayer magnetic interactions, adding an entirely new magnetic degree of freedom to vdW interfacial engineering. In this dissertation, we …
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Magnetische Halbleiter zum Einsatz in der Spinelektronik : Europiumsulfid und magnetisch dotiertes Galliumnitrid
In this work, magnetic semiconductors were investigated. The work on magnetic semiconductors is motivated by the great interest in the field of spinelectronics in recent years. Of particular interest are magnetic semiconductors which are ferromagnetic with Curie-temperatures well above room …
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Novel Quantum Materials for Spintronic and Opto-Electronic Applications
… instance, in spintronics, materials such as ferromagnetic half-metals, Giant Magnetoresistants (GMR), and magnetic semiconductors have been extensively studied due to their ability to manipulate the spin of electrons for applications in magnetic storage. In opto-electronics, materials such as …
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Current-induced torque driven ferromagnetic resonance in magnetic microstructures
… and an alternating current in a uniform ferromagnetic system. Diluted magnetic semiconductors (Ga,Mn)As and (Ga,Mn)(As,P) have been studied. Due to their strong spin-orbit coupling and well-understood band-structure, these materials are well-suited to this investigation. The combined effect of …
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Experimental validation of the predicted emergent magnetism in diamagnetic cadmium sulfide (Cds) doped with boron
… persistent photoconductivity displayed by some semiconductors provides a way to control magnetism with light, through illumination-control of free carrier concentration and thereby magnetic interaction in dilute magnetic semiconductors. CdS is a wide band-gap semiconductor that displays large …
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First-principles and Many-Body Methods: Implementations and Applications to Study Spintronic Materials
Diluted magnetic semiconductors (DMSs) and magnetoresistive materials are instrumental for the development of spintronic technology. Before we are able to engineer spintronic devices, it is necessary to understand the properties of materials from which spintronic devices are made, otherwise time …
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Magnetic, thermodynamic and transport properties of the magnetic semiconductor Fe₁₋xCoxS₂ and superconducting LaSb₂
In recent years magnetic semiconductors have attracted a great deal of attention because it is thought that they can be used to generate spin polarized current in spintronics, an emerging field where the spin degree of freedom of charge carriers is utilized in microelectronic devices. In this …
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Nachweis der elektrischen Spin-Injektion in II-VI-Halbleiter mittels Messung des elektrischen Widerstandes
… verdünnte magnetische Halbleiter ("diluted magnetic semiconductors", DMS) als Injektor-Materialien für die elektrische Spininjektion in Halbleiter gut geeignet sind. Im Jahr 1999 wurde darüber hinaus die elektrische Injektion von einem DMS in einem nicht magnetisch dotierten Halbleiter ("non …
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Frustrated Magnetism in Strongly Correlated Electron Systems
… of magnetism is essential for its application in magnetic semiconductors, spintronic devices and unconventional superconductors. In this work, we study magnetic structures and their corresponding excitations in several strongly correlated electron systems, where exotic orderings can be induced as …
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Optimization of gadolinium-doped zinc oxide films for diluted magnetic semiconductor and its effects on organic solar cell performance
Diluted Magnetic Semiconductors (DMS) are being actively studied as a major step towards the realization of spintronic devices. However, to obtain the DMS with ferromagnetic behaviour at room temperature is the main obstacle in the fabrication of spintronic devices. This obstacle has prompted …
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Many-body contributions to spin relaxation in semiconductors
… driven by the spin-orbit interaction in semiconductors, spin relaxation describes the rate at which spin polarized particles return to an equilibrium spin distribution. This is generally in competition with the goals of spintronic devices which generate out-of-equilibrium spin populations …
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Diluted Magnetic Semiconductor Cobalt and Europium Implanted ZnO Thin Film
Diluted magnetic semiconductors (DMSs) have initiated enormous scientific interests because of their potential for multifunctional spintronics devices. ZnO based semiconductors have been identified to be the promising room temperature ferromagnetic materials with a wide band-gap. However, the …
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Investigation of magnetic interactions in topological insulators
… This thesis is a comprehensive study of magnetic interactions in topological insulators, from both experimental and theoretical perspective. Generically, there are two approaches to bring TI magnetic, the proximity effect and the conventional transitional metal ion doping. In the …
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