Magnetic properties of Mn, Ni and Fe based metal-organic complexes [Elektronische Ressource] / Anupama Parameswaran. Gutachter: Bernd Büchner ; Hans-Henning Klauß ; Georgeta Salvan. Betreuer: Bernd Büchner

Magnetic properties of Mn, Ni and Fe basedmetal-organic complexesDissertationzur Erlangung des akademischen GradesDoctor rerum naturalium(Dr. rer. nat.)vorgelegtder Fakultät Mathematik und Naturwissenschaftender Technichen Universität DresdenvonAnupama Parameswaranaus Kerala, IndienJune 2010Gutachter: Prof. Dr. Bernd BüchnerGutachter: Prof. Dr. Hans-Henning KlaußGutachter: Prof. Dr. Georgeta SalvanAbstractThis dissertation presents the investigation of magnetic exchange and anisotropyin novel metal-organic complexes containing minimum number of magnetic ions.Such complexes can serve as a model system to understand the exciting magneticphenomenas in such class of materials and also can put forward as candidates forthe so called molecular nanomagnets.A direct assessment of the effective magnetic moment and the effective interactionbetween the metal ions in the complex can be done using magnetization measure-ments. Here the magnetization studies are performed as a function of temperatureand field using a SQUID magnetometer. Yet another powerful tool to character-ize and determine the spin levels, the ESR spectroscopic methods, has also beenexploited. The study of the dynamical properties of this class of materials was rel-evant to understand the relaxation mechanism in the low temperatures. For this anew ac susceptometer has been built in house which was another main objective ofthis dissertation work.