  A simple mechanism of controllable switching of magnetic vortex chirality is
proposed. We consider curvilinear magnetic nanoshells of spherical geometry
whose ground state is a vortex magnetization distribution. Chirality of this
magnetic vortex can be switched in controllable way by applying a Gaussian
pulse of spatially uniform magnetic field along the symmetry axis of the shell.
The chirality switching process is explored in detail numerically for various
parameters of magnetic pulse: the corresponding switching diagram is build. The
role of the curvature is ascertained by studying the switching diagram
evolution under the continuous transition from hemispherical shell to the disk
shaped sample with the volume and thickness kept constant.
