Speaker
Ms
Stephanie Stevenson
(Paul Scerrer Institut)
Description
We explore the linear and nonlinear dynamic regimes of micrometer-scale Ni81Fe19 squares. The response of the magnetisation under a continuous sinusoidal excitation is monitored by time-resolved scanning transmission x-ray microscopy. Non-equilibrium domain configurations are dynamically stabilized under increasing amplitude of the excitation field. On reducing this amplitude, the magnetisation returns to the equilibrium configuration. We have spatially resolved the transition between two stable magnetic configurations and present complementary micromagnetic simulations alongside the experimental data, which provide insight into the energy dissipation and spin wave contributions. Spin wave instabilities, which arise in the non-linear regime and play a role in the generation of non-equilibrium modes can ultimately lead to vortex core reversal.
Primary author
Ms
Stephanie Stevenson
(Paul Scerrer Institut)
Co-authors
Christoforos Moutafis
(Paul Scherrer Institut)
Dr
Christoph Quitmann
(Paul Scherrer Institut)
Mr
Georg Heldt
(Paul Scherrer Institut)
Dr
Jörg Raabe
(PSI)
Dr
Laura Heyderman
(Paul Scherrer Institute)
Mr
Phillip Wohlhüter
(Paul Scherrer Institut)
Dr
Rajesh Vilas Chopdekar
(Paul Scherrer Institut)
