Tunable High-Field/ High-Frequency ESR and High-Field Magnetization on Single-Molecule Clusters

• Main Author: Golze, Christian
• Other Authors: Technische Universität Dresden, Physik
• Format: Doctoral Thesis
• Language: English
• Published: Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden 2008
• Subjects: molecular magnetism; single molecule magnets; SMM; magnetic anisotropy; magnetic clusters; nanomagnets; HF ESR; ESR; magnetic field; pulse field; pulsed field; magnetic resonance; electron paramagnetic resonance; g-factor; exchange coupled systems; molekulare magneten; einzelmolekülmagnet; magnetische anisotropie; magnetische cluster; nanomagnete; Hochfeld ESR; Elektronenspinresonanz; magnetische Resonanz; Pulsfeld; gepulste Felder; magnetischer Austausch; austauschgekoppelte Systeme; ddc:530; rvk:UP 6900
• Online Access: http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1199739868406-44757; http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1199739868406-44757; http://www.qucosa.de/fileadmin/data/qucosa/documents/803/1199739868406-4475.pdf

In this work, low dimensional iron group clusters have been studied by application of high magnetic fields. The magnetization has been probed with an MPMS as function of temperature and field. The combination with pulse field measurements up to 52\,T allowed determination of the magnetic exchange coupling parameters, and to probing the effective spin of the ground state. The main focus was on tunable high-field/high-frequency (tHF) ESR in static fields < 17 T and pulse field ESR up to 36 T. This magnetic resonance method has been used for the characterization of the local magnetic properties: The detailed analysis of the field dependence of dedicated spin states allowed to determine the magnetic anisotropy and g-factors. The results were analyzed in the framework of the appropriate effective spin Hamiltonians in terms of magnetization fits and ESR spectrum simulations.