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In the paper, the authors first review the structural and functional characteristics of magnetic nanodevices where magnetisation rotations and microwave oscillations are induced by DC electrical currents due to the spin-transfer torque effect. A comparison is made between devices with different structures. Micromagnetic simulations based on the modified Landau-Lifshitz-Gilbert equation are carried out in detail on one of the structures. The study shows that the spin-polarised direct current drives the inhomogeneous magnetisation configuration to rotate in the constrained square magnet structure. Magnetisation configurations and dynamics depend on the input current density and the structure dimension.