On the basis of the micromagnetic simulations we reveal that in the "small disk on big disk" ("d+D") nanostructure it is possible the sustained existence of a single-domain and vortex configurations of magnetization. The presence of the metastable state is possible due to the energy barrier, which is caused by magnetostatic interaction between disks. Switching between states can be performed by the external high frequency excitation. Magnetization switching of the "small disk on big disk" nanostructure is determined by the interaction of the vortex core in big disk with z-component of the magnetization of small disk.
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