Abstract
Magnetic domain wall motion is at the heart of new magnetoelectronic technologies and hence the need for a deeper understanding of domain wall dynamics in magnetic systems. In this context, numerical simulations using simple models can capture the main ingredients responsible for the complex observed domain wall behavior. We present a scalar field model for the magnetization dynamics of quasi-two-dimensional systems with a perpendicular easy axis of magnetization which allows a direct comparison with typical experimental protocols, used in polar magneto-optical Kerr effect microscopy experiments. We show that the thermally activated creep and depinning regimes of domain wall motion can be reached and the effect of different quenched disorder implementations can be assessed with the model. In particular, we show that the depinning field increases with the mean grain size of a Voronoi tessellation model for the disorder.
Highlights
The study of field-induced magnetic domain wall motion in thin ferromagnetic films has received great attention during last decades
Magnetic domain wall motion is at the heart of new magneto-electronic technologies and the need for a deeper understanding of domain wall dynamics in magnetic systems
We present a scalar-field model for the magnetization dynamics of quasi-two-dimensional systems with a perpendicular easy axis of magnetization which allows a direct comparison with typical experimental protocols, used in polar magneto-optical Kerr effect microscopy experiments
Summary
The study of field-induced magnetic domain wall motion in thin ferromagnetic films has received great attention during last decades. The measured domain wall displacement is proportional to the pulse duration, giving a measure of the domain wall velocity The insight that these experimental techniques can provide are naturally limited by several experimental factors: the camera resolution, magnetic field pulse characteristics as maximum amplitude and minimum width, control of the sample temperature and sample characteristics as the defect density and disorder of the sample under study. We are interested in the study of magnetic domain wall dynamics in thin films with strong perpendicular anisotropy In this kind of systems, the magnetic moment of the material is given by the time-dependent vector field m(ρ, τ ), where ρ and τ are the two-dimensional space and time coordinates, respectively. For more details on the numerical solution of Eq (9) the reader may refer to [36]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
