Energy storage of vortex magnetic field

Can a vortex core polarization be used as a data storage method?

The application of small bursts of an oscillating magnetic field can be used to reverse controllably the gyration direction of a vortex core structure, and hence switch the direction of the out-of-plane vortex core polarization. This raises the possibility of using this core switching scheme as a means of magnetic data storage.

What is a magnetic vortex?

A magnetic vortex (1, 2) is one of the fundamental spin configurations occurring in thin micrometer-/nanometer-sized ferromagnetic disk elements due to the confinement of spins imposed by geometrical restrictions (2, 3).

Could ferromagnetic disks have a magnetic vortex core?

Researchers have also theoretically predicted the remarkable reduction of the required magnetic switching field for a topological magnetic vortex core at a temperature closely below the Curie point (36) and the possibility of all-optical switching of a magnetic vortex core (37) in ferromagnetic disks.

How does a vortex structure react with an alternating magnetic field?

The vortex structure is excited with an alternating magnetic field (frequency 250 MHz, amplitude 0.1 mT). Two sequences (phase steps 90°) of images show the dynamic response of the vortex structure before and after a 4 ns ‘single period’ burst (amplitude 1.5 mT).

What is a ferromagnetic vortex?

The vortex state, characterized by a curling magnetization, is one of the equilibrium configurations of soft magnetic materials 1, 2, 3, 4 and occurs in thin ferromagnetic square and disk-shaped elements of micrometre size and below. The interplay between the magnetostatic and the exchange energy favours an in-plane, closed flux domain structure.

How do magnetostatic and exchange energy affect a vortex structure?

The interplay between the magnetostatic and the exchange energy favours an in-plane, closed flux domain structure. This curling magnetization turns out of the plane at the centre of the vortex structure, in an area with a radius of about 10 nanometres—the vortex core5,6,7.