Method for finding mechanism and activation energy of magnetic transitions, applied to skyrmion and antivortex annihilation
2015 (English)In: Computer Physics Communications, ISSN 0010-4655, E-ISSN 1879-2944, Vol. 196, 335-347 p.Article in journal (Refereed) Published
A method for finding minimum energy paths of transitions in magnetic systems is presented. The path is optimized with respect to orientation of the magnetic vectors while their magnitudes are fixed or obtained from separate calculations. The curvature of the configuration space is taken into account by: (1) using geodesics to evaluate distances and displacements of the system during the optimization, and (2) projecting the path tangent and the magnetic force on the tangent space of the manifold defined by all possible orientations of the magnetic vectors. The method, named geodesic nudged elastic band (GNEB), and its implementation are illustrated with calculations of complex transitions involving annihilation and creation of skyrmion and antivortex states. The lifetime of the latter was determined within harmonic transition state theory using a noncollinear extension of the Alexander-Anderson model.
Place, publisher, year, edition, pages
[Bessarab, Pavel F.] Royal Inst Technol KTH, Dept Mat & Nanophys, SE-16440 Kista, Sweden. [Bessarab, Pavel F.; Uzdin, Valery M.] St Petersburg State Univ, Dept Phys, St Petersburg 198504, Russia. [Uzdin, Valery M.] St Petersburg Natl Res Univ Informat Technol Mech, St Petersburg 197101, Russia. [Jonsson, Hannes] Univ Iceland, Fac Phys Sci, Reykjavik, Iceland. [Jonsson, Hannes] Aalto Univ, Dept Appl Phys, FIN-00076 Espoo, Finland., 2015. Vol. 196, 335-347 p.
Magnetic transitions, Minimum energy path, Mechanism, Activation energy
IdentifiersURN: urn:nbn:se:kth:diva-176330DOI: 10.1016/j.cpc.2015.07.001ISI: 000362602900031ScopusID: 2-s2.0-84942195019OAI: oai:DiVA.org:kth-176330DiVA: diva2:867044
QC 201511042015-11-042015-11-032015-11-04Bibliographically approved