Micromagnetic simulations of spin-wave normal modes and the resonant field-driven magnetization dynamics of a 360° domain wall in a soft magnetic stripe
Ημερομηνία
2010Συγγραφέας
Roy, P. E.Trypiniotis, Theodossis
Barnes, C. H. W.
ISSN
1098-0121Source
Physical Review B - Condensed Matter and Materials PhysicsVolume
82Issue
13Google Scholar check
Metadata
Εμφάνιση πλήρους εγγραφήςΕπιτομή
Spin normal modes of a 360° domain wall trapped in a stripe are investigated by micromagnetic simulations, for two in-plane field excitation directions. Within the substructure of the 360° domain wall, we identify highly localized, low-frequency spin-wave well-type modes on the lateral boundaries and in the surrounding subdomain walls. At intermediate frequencies, oscillations distributed over a range of modes located in different regions of the substructure's domain walls are found. Higher-frequency oscillations such as quasiuniform and multinodal spin-wave modes are identified inside each of the constituent subdomains. Mode splitting due to interaction with traveling spin waves is found. Indications are that domain mode quantization due to confinement effects induced by the constituent domain walls are relatively weak. Strong hybridization between domain and domain-wall modes are likely to occur within a certain frequency interval. Finally, we resonantly drive the system at the four lowest frequency modes, whereby the in-plane behavior of the 360° structure displays translational, breathing, and wobbling motions. © 2010 The American Physical Society.