We have studied the effect of the dipolar magnetic coupling (also known as Néel coupling or "orange-peel" coupling) in tunneling magnetoresistive (TMR) elements. With an in situ scanning tunneling microscope we directly accessed the roughness of the films and found a close correspondence between the values for the coupling fields determined by the magneto-optical Kerr effect and the ones computed on the basis of the measured morphology parameters. We confirm an increase of the dipole coupling between magnetic layers with decreasing barrier thickness as predicted by the model. Deviations from the theoretical predictions are observed for the case of thinner soft magnetic layers, which can be explained by reduced magnetisation in very thin films. We demonstrate the importance of dipolar coupling for understanding the magnetic behaviour of TMR elements by comparing TMR curves for optimised and nonoptimised structures.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa.de:swb:14-1014902838734-10106 |
| Date | 12 January 2002 |
| Creators | Tegen, Stefan |
| Contributors | Technische Universität Dresden, Mathematik und Naturwissenschaften, Physik, Institut für Festkörper- und Werkstofforschung, Prof. Dr. Jörg Fink, Prof. Dr. Jörg Fink, Prof. Dr. Clemens Laubschat, Prof. Dr. Günther Reiss |
| Publisher | Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | deu |
| Detected Language | English |
| Type | doc-type:doctoralThesis |
| Format | application/pdf |
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