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Solitons are very promising for the design of next generation of ultralowpower devices for storage and computation. The key ingredient to achieve thisgoal is the fundamental understanding of their stabilization and manipulation.Here, we show how the interfacial Dzyaloshinskii Moriya Interaction (i DMI) isable to lift the energy degeneracy of a magnetic vortex state by stabilizing atopological soliton with radial chirality, hereafter called radial vortex. Ithas a non-integer skyrmion number S (0.5<|S|<1) due to both the vortex corepolarity and the magnetization tilting induced by the i DMI boundaryconditions. Micromagnetic simulations predict that a magnetoresistive memorybased on the radial vortex state in both free and polarizer layers can beefficiently switched by a threshold current density smaller than 106 A/cm2. Theswitching processes occur via the nucleation of topologically connectedvortices and vortex antivortex pairs, followed by spin wave emissions due tovortex antivortex annihilations.

Magnetic radial vortex stabilization and efficient manipulation driven by the Dzyaloshinskii Moriya Interaction and the spin-transfer torque