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We demonstrate an enhanced, bidirectional, in-plane magnetic field tuning ofthe gyrotropic resonance frequency of a magnetic vortex within a disk byintroducing a flat edge. When the core is in its vicinity, the flat edgelocally reduces the core's directional dynamic stiffness for movement parallelto the edge. This strongly reduces the net dynamic core stiffness, leading tothe gyrotropic frequency being significantly less than when the core iscentered (or located near the round edge). This leads to the measurable rangeof gyrotropic frequencies being more than doubled and also results in a clearchirality-mediated bistability of the gyrotropic resonance frequency due towhat is effectively a chirality-dependence of the core's confining potential.

Chirality-mediated bistability and strong frequency downshifting of the gyrotropic resonance of a dynamically de-stiffened magnetic vortex