Applying electric field to control magnetic properties would be a very convenient and energy-efficient way for spintronics devices. However, the control of magnetic characteristics by electric fields is not straightforward, due to the time-reversal symmetry of magnetism versus spatial inversion symmetry of electricity. Such fundamental difficulty makes it challenging to modify the topology of magnetic skyrmionic states with electric field. Here, we propose a novel mechanism that realizes the electric-field (E) switching of magnetic topological charge (Q) in a controllable and reversible fashion, through the mediation of electric polarization (P) and Dzyaloshinskii-Moriya interaction (D). Such mechanism is coined here EPDQ. Its validity is demonstrated in a multiferroic VOI2 monolayer, which is predicted to host magnetic bimerons. The change in magnetic anisotropy is found to play a crucial role in realizing EPDQ process and its microscopic origin is discussed. Our study thus provides a new approach toward the highly-desired electric-field control of magnetism.

Electric-Field Switching of Magnetic Topological Charge in Type-I Multiferroics

O3: Skyrmions and Beyond

technical paper

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Changsong Xu

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Electric-Field Switching of Magnetic Topological Charge in Type-I Multiferroics

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