Publikationsserver der RWTH Aachen University
Magnetic domain walls in ultrathin films : contribution of the Dzyaloshinsky-Moriya interaction
Abstract
dc:descriptionIn this theoretical thesis the structure of magnetic domain walls is explained by an interplay of spin stiffness, anisotropy energy and Dzyaloshinsky-Moriya interaction. The wall structures are discussed within a micromagnetic model and the corresponding model parameters are obtained ab initio by electronic-structure calculations. The inclusion of the Dzyaloshinsky-Moriya interaction in these investigations is a new aspect. This interaction arises only in certain crystal symmetries, it is of particular importance in the studied ultrathin magnetic films deposited on non-magnetic surfaces. The Dzyaloshinsky-Moriya interaction leads to unusual domain-wall structures that can be classified in several distinct phases. The ab-initio calculations are done with the FLAPW method that relies on density functional theory. Within this method a perturbative approach is developed, that allows to estimate the effect of spin-orbit coupling on spin spirals with large spatial periods and thus allows to estimate the strength of the Dzyaloshinsky-Moriya interaction. The theory is applied to the system Fe/W(110), i.e. to the W(110)-surface covered with one respectively two atomic layers of Fe. The domain-wall widths are calculated and compared with experimental data. Furthermore, a new explanation is given for the experimentally observed phenomenon, that the domain walls in the Fe double-layer are preferably oriented along the [1-10]-direction.
Degree
thesis:*- Grantor dc:publisher
- Publikationsserver der RWTH Aachen University
- Year dc:date
- 2006
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Heide, Marcus
- Contributors dc:contributor
-
- Blügel, Stefan
Subjects
dc:subject × 7Rights
dc:rights- Statement dc:rights
-
- info:eu-repo/semantics/openAccess
- Language dc:language
- eng