Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 18: SYM Thin Film Magnetic Materials: Microstructure, Reaction and Magnetic Coupling I

MM 18.1: Hauptvortrag

Dienstag, 26. Februar 2008, 10:15–10:45, H 0107

Local Probing of Magnetic Properties by Electron Microscopy — •Josef Zweck — NWF II - Physik, Universität Regensburg

Presently, huge efforts are made to combine magnetism with sensors or other electronic devices, or to simply use patterned magnetic materials for data storage. Frequently cited applications include GMR-based magnetic field sensors, spin transistors or "spintronics" and magnetic random access memories (MRAMs). The existing as well as future applications require the ability to manufacture magnetic devices far below the micrometer range and to characterize them.

One of the few techniques capable to investigate magnetic properties of individual magnetic particles with both high lateral (5 nm) and magnetic (2.5 Tnm) resolution is electron microscopy. The talk will demonstrate the ability to characterize individual magnetic particles and the dependence of the magnetic properties on their size and geometry. While control of size and shape can lead to the design of magnetic properties (single domain switching, taylored hysteresis loops, superparamagnetic behaviour) the lack of precise control can lead to arbitrary switching behaviour and unexpected domain structures.