Electrical tuning of skyrmion dynamics in multiferroic composite thin films
Abstract
A lack of space-inversion symmetry along with broken time-reversal symmetry at ferromagnetic/ferroelectric interfaces gives rise to the electric field control of the effective magnetic field and the Dzyaloshinskii-Moriya interaction, thus allowing for the formation of multiferroic skyrmions at room temperature. The electric-field-driven evolution of spin textures at the ferromagnetic/ferroelectric interface is investigated by means of Monte Carlo simulations. It is demonstrated that the skyrmion lattice can be stabilized by the moderate interfacial magnetoelectric couplings. The chirality, radius, position, and numbers of skyrmions are found to be tunable by an external the electric field. The nonequilibrium dynamics of skyrmions, however, strongly depends on the frequency of the applied time-oscillating electric field. With the increase of the frequency of the ac electric field, multiferroic skyrmions become unstable and after several periods they are, ultimately, damping down to the helimagnetic phase. Under microwavelike electric fields, the dynamic multiferroic response of the skyrmion lattice is anisotropic and inhomogeneous. The electric-field-induced resonance spectrum of the magnetic skyrmion with a distinct peak in the imaginary part of permeability is successfully simulated by the Fourier transformation of magnetization.
- Publication:
-
Physical Review B
- Pub Date:
- September 2019
- DOI:
- 10.1103/PhysRevB.100.104410
- Bibcode:
- 2019PhRvB.100j4410Y