Sökning: "magnetic nano-structures"
Visar resultat 1 - 5 av 7 avhandlingar innehållade orden magnetic nano-structures.
1. Collective properties of magnetic mesospins
Sammanfattning : Mesoscopic spin systems consist of an ensemble of lithographically patterned nanomagnetic elements - mesospins. The interactions between the mesospins, can be designed at will by altering their lateral arrangement, enabling the study of collective magnetic order in a wide range of systems. LÄS MER
2. Tailoring the magnetic order in mesoscopic spin systems
Sammanfattning : Mesoscopic spin systems can be designed and fabricated using modern nano-fabrication techniques. These systems can contain large numbers of patterned ferromagnetic elements, for which the shape will generally determine their effective mesospin dimensionality. LÄS MER
3. Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles
Sammanfattning : Nanomaterials are important tools for enabling technological progress as they can provide dramatically different properties as compared to the bulk counterparts. The field of nanoparticles is one of the most investigated within nanomaterials, thanks to the existing, relatively simple, means of manufacturing. LÄS MER
4. Strongly non-linear magnetization dynamics in nano-structures: perturbations, multi-mode generation, and topological droplets
Sammanfattning : Spin torque oscillators (STOs) are magnetic nano-devices in which strongly non-linear magnetodynamic phenomena can be excited by current. In this thesis, we study some of these phenomena by means of micromagnetic simulations, analytical calculations, and electrical characterization. Three main subjects are discussed: 1. LÄS MER
5. Transmission Electron Microscopy of Semiconductor Nanowires
Sammanfattning : Semiconductor nanowires are studied by using transmission electron microscopy (TEM) based methods in this work. In the first section, the growth mechanism of gallium arsenide nanowires grown by chemical beam epitaxy is investigated. The nanowires are epitaxially grown from a gallium arsenide substrate by using gold seed particles as catalysts. LÄS MER