Abstract
This work explores the magnetization dynamics in an epitaxial nanomagnet. The authors link the observed vortex core switching dynamics to the critical velocity switching model using micromagnetic modeling.
Highlights
A detailed understanding of the static and dynamic properties of magnetic thin-film structures is crucial for their successful implementation in technological devices such as logic and memory applications [1,2,3]
The magnetic vortex core gyration in the Landau pattern is excited by application of 12-ns magnetic field pulses along the diagonal of the square every 40 ns
The results are complemented by micromagnetic simulations, shown in the bottom row, where the vortex core is initialized with p = −1
Summary
A detailed understanding of the static and dynamic properties of magnetic thin-film structures is crucial for their successful implementation in technological devices such as logic and memory applications [1,2,3]. Microstructures defined in soft ferromagnetic thin films can minimize their stray field by adopting a magnetic vortex configuration in which the magnetization is contained in the sample plane and curls around the center of the structure. To avoid the formation of a singularity the magnetization will turn out of the sample plane at the very center, forming the so-called vortex core. In addition to potential device applications, the vortex structure is a good test bench for fundamental studies of magnetic interactions
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