Chiral symmetry breaking of magnetic vortices by sample roughness Export

@article{citeulike:3889951, abstract = {Finite-element micromagnetic simulations are used to study the chiral symmetry breaking of magnetic vortices in thin-film magnetic structures, caused by surface roughness. An asymmetry between vortices with different core polarizations has been experimentally observed for square-shaped platelets. E.g., the threshold fields for vortex core switching were found to differ for core up and down. This asymmetry was however not expected for these symmetrically-shaped structures, where both core polarizations should behave symmetrically. Three-dimensional finite element simulations are employed to show that a small surface roughness can break the symmetry between vortex cores pointing up and down. A relatively small sample roughness is found sufficient to reproduce the experimentally observed asymmetries. It arises from the lack of mirror-symmetry of the rough thin-film structures, which causes vortices with different chiralities to exhibit asymmetric dynamics.}, archivePrefix = {arXiv}, author = {Vansteenkiste, A. and Weigand, M. and Curcic, M. and Stoll, H. and Sch\&\#xfc;tz, G. and Van Waeyenberge, B.}, citeulike-article-id = {3889951}, citeulike-linkout-0 = {http://arxiv.org/abs/0901.2014}, citeulike-linkout-1 = {http://arxiv.org/pdf/0901.2014}, day = {14}, eprint = {0901.2014}, keywords = {magnets, stephan, wen}, month = {Jan}, posted-at = {2009-01-16 00:16:10}, priority = {2}, title = {Chiral symmetry breaking of magnetic vortices by sample roughness}, url = {http://arxiv.org/abs/0901.2014}, year = {2009} }

TY - JOUR ID - citeulike:3889951 L3 - citeulike-article-id:3889951 N2 - Finite-element micromagnetic simulations are used to study the chiral symmetry breaking of magnetic vortices in thin-film magnetic structures, caused by surface roughness. An asymmetry between vortices with different core polarizations has been experimentally observed for square-shaped platelets. E.g., the threshold fields for vortex core switching were found to differ for core up and down. This asymmetry was however not expected for these symmetrically-shaped structures, where both core polarizations should behave symmetrically. Three-dimensional finite element simulations are employed to show that a small surface roughness can break the symmetry between vortex cores pointing up and down. A relatively small sample roughness is found sufficient to reproduce the experimentally observed asymmetries. It arises from the lack of mirror-symmetry of the rough thin-film structures, which causes vortices with different chiralities to exhibit asymmetric dynamics. TI - Chiral symmetry breaking of magnetic vortices by sample roughness KW - magnets KW - stephan KW - wen AU - Vansteenkiste, A AU - Weigand, M AU - Curcic, M AU - Stoll, H AU - Schütz, G AU - Van Waeyenberge, B PY - 2009/Jan/14/ UR - http://arxiv.org/abs/0901.2014 ER -