A micromagnetic description of spin waves in ferromagnetic films
22 februari 2017
UAntwerpen, Campus Groenenborger, T.138 - Groeneborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger
16 - 17 uur
Condensed Matter Theory presented by Jeroen Mulkers
Contact e-mail: email@example.com
The theory of micromagnetism, in which the magnetisation is described by a continuous vector field, describes ferromagnetism on the submicron-scale. In this talk, I will give an introduction to spin waves in ferromagnetic films using the micromagnetic framework. Starting from the Landau-Lifshitz-Gilbert equation, which governs the dynamics of the magnetization, it is fairly straightforward to calculate the spin wave dispersion relation of ferromagnetic films. I will discuss how the dispersion relation depends on the exchange interaction strength, the presence of uniaxial anisotropy, and the chiral Dzyaloshinskii-Moriya interaction strength. In the second part of my talk, I will show how one can efficiently compute the eigenmodes of spin structures such as vortices and skyrmions.