The spin structure of magnetic nanoparticles and in magnetic nanostructures [Elektronische Ressource] / Sabrina Disch

The spin structure of magnetic nanoparticlesand in magnetic nanostructuresVon der Fakultät für Mathematik, Informatik und Naturwissenschaften derRWTH Aachen University zur Erlangung des akademischen Gradeseiner Doktorin der Naturwissenschaften genehmigte Dissertationvorgelegt vonDiplom ChemikerinSABRINA DISCHaus KölnBerichter: Universitätsprofessor Dr. Th. Brückel Dr. U. SimonTag der mündlichen Prüfung: 10.12.2010Diese Dissertation ist auf den Internetseiten der Hochschulbibliothek online verfügbar.FamilieMeinerThe present thesis provides an extensive and original contribution to the investigationof magnetic nanoparticles regarding synthesis and structural characterization using ad vanced scattering methods in all length scales between the atomic and mesoscopic sizerange. Particular emphasis is on determination of the magnetic structure of singlenanoparticles as well as preparation and characterization of higher dimensional assem blies thereof.The unique physical properties arising from the finite size of magnetic nanoparti cles are pronounced for very small particle sizes. With the aim of preparing magneticnanoparticles suitable for investigation of such properties, a micellar synthesis route forvery small cobalt nanoparticles is explored. Cobalt nanoparticles with diameters of lessthan 3 nm are prepared and characterized, and routes for variation of the particle sizeare developed.