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Scanning transmission x-ray microscopy is employed to investigateexperimentally the reversal of the magnetic vortex core polarity in cylindricalNi81Fe19 nanodisks triggered by two orthogonal monopolar magnetic field pulseswith peak amplitude $B_0$, pulse length ${\tau}$=60 ps and delay time${\Delta}$t in the range from -400 ps to +400 ps between the two pulses. Thetwo pulses are oriented in-plane in the x- and y-direction. We haveexperimentally studied vortex core reversal as function of $B_0$ and${\Delta}$t. The resulting phase diagram shows large regions of unidirectionalvortex core switching where the switching threshold is modulated due toresonant amplification of azimuthal spin waves. The switching behavior changesdramatically depending on whether the first pulse is applied in the x- or they-direction. This asymmetry can be reproduced by three-dimensionalmicromagnetic simulations but not by two-dimensional simulations. This behaviordemonstrates that in contrast to previous experiments on vortex core reversalthe three-dimensionality in the dynamics is essential here.

journal of applied physics

Spin wave mediated unidirectional Vortex Core Reversal by Two Orthogonal  Monopolar Field Pulses: The Essential Role of Three-dimensional Magnetization  Dynamics