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Polarity reversal of a magnetic vortex core by a unipolar, nonresonant in-plane pulsed magnetic field
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Image of FIG. 1.
FIG. 1.

Experimental results of magnetic vortex core polarity reversal. The initial core polarity was up, determined from the sense of the vortex gyration revealed by the TR-PEEM images taken with 1 mT field pulses [panel (a)]. The core polarity was reversed to down polarization after pulsing at 5 mT for 2 s for the second time [panel (b)]. The core polarity was switched back to up polarization after the fourth pulse train.

Image of FIG. 2.
FIG. 2.

Transient domain states observed both in experiment and simulation shortly after the falling edge of a 5 mT excitation pulse (removed at time ). The experimental PEEM images (top row) agree well with the micromagnetic simulations (second row). The cross-sectional plots of along the direction (bottom row) reveal that the vortex core is replaced by a complex cross-tie domain wall consisting of a series of cores of both positive and negative polarities.

Image of FIG. 3.
FIG. 3.

Simulated domain wall evolution in a disk. Sequence shows the detailed evolution of the central domain wall region for the first 6.6 ns. This simulation is for a -diameter disk excited by a 5 MT pulse amplitude with 200 ps fall time and other simulation parameters are the same as described in the manuscript. The movie is zoomed into a area centered along the direction, shifted up by in the direction. The red and blue represent the magnitude of the magnetic moment along + and , respectively. (Enhanced online.) [URL: http://dx.doi.org/10.1063/1.3111430.1]10.1063/1.3111430.1

Image of FIG. 4.
FIG. 4.

Micromagnetic simulations of core reversal probability for a 500-nm-diameter, 30-nm-thick disk at using ten different random seeds. The top panel shows whether the core polarity changed (yellow/light) or stayed the same (blue/dark) on the rising and falling edges of the pulse. White indicates an undetermined (multivortex or expelled vortex) state. The lower panel summarizes the overall probability of core reversal as a function of the field pulse amplitude excluding undetermined states.



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Scitation: Polarity reversal of a magnetic vortex core by a unipolar, nonresonant in-plane pulsed magnetic field