Epitaxial Nd-Fe-B films [Elektronische Ressource] : growth, texture, magnetism and the influence of mechanical elongation / von Ah-Ram Kwon

Epitaxial Nd-Fe-B films: Growth, texture, magnetism and the influence of mechanical elongation Von der Fakultät Maschinenwesen der Technischen Universität Dresden zur Erlangung des akademischen Grades Doktoringenieur (Dr.-Ing.) angenommene Dissertation von M.Sc. Ah-Ram Kwon Geboren am 06. 10. 1977 in Seoul 2009 Tag der Einreichung: 14.10.2008 Tag der verteidigung : 17.04.2009 1. Gutachter: Prof. Dr. L. Schultz (TU Dresden und IFW Dresden) 2. Gutachter: Prof. Dr. D. Meyer (TU Dresden) 3. Gutachter: Prof. Dr. J. Fidler (TU Wien) Abstract The work in this thesis focuses on the preparation of epitaxial Nd-Fe-B thin films using pulsedlaser deposition for good hard magnetic properties. They are suitable for a basic understanding of the intrinsic magnetic properties. Compositional control was necessary to achieve phase formation with improved magnetic properties. Nd-Fe-B samples were prepared on single crystal MgO (001) substrates with different buffer layers in order to obtain good textures with different surface morphology. The smooth and continuous epitaxial films were suitable for performing magnetization measurements under stress. Although the magnetostriction is easily neglected in the Nd Fe B 2 14compound, distinguishable inverse magnetostriction was observed by conventional tensile elongation with a flexible substrate.