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Scanning SQUID Study of Vortex Manipulation by Local Contact

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Published on: February 1, 2017

Dynamics of a pinned magnetic vortex.

R L Compton¹, P A Crowell

¹School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, Minnesota 55455, USA.

Physical Review Letters

|October 10, 2006

Summary

We studied magnetic vortex dynamics in ferromagnetic films. The vortex core

Area of Science:

Condensed matter physics
Magnetism and magnetic materials

Background:

Magnetic vortices are fundamental spin structures in ferromagnetic materials.
Defects in magnetic films can pin magnetic vortices, influencing their dynamics.

Purpose of the Study:

To investigate the amplitude-dependent dynamics of a single magnetic vortex pinned by a defect.
To understand the transition between low- and high-excitation regimes and the role of depinning.

Main Methods:

Experimental observation of magnetic vortex core gyration in a ferromagnetic film.
Varying excitation amplitudes to probe different dynamic regimes.
Applying static in-plane magnetic fields to map pinning site distributions.

Main Results:

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At low amplitudes, vortex gyration frequency is determined by a single pinning site.
At high amplitudes, frequency depends on the magnetostatic energy of the confined vortex.
A sharp transition occurs due to vortex depinning from the defect.

Conclusions:

The study reveals distinct dynamic behaviors of a pinned magnetic vortex based on excitation amplitude.
Depinning from defects is a critical mechanism governing vortex dynamics.
The method allows for characterization of pinning site distributions.