Electric field induced by dynamical change of dipolar configurations in ferromagnets.
An analytical expression for the electric field, Eint, induced by any dynamical change of dipolar configuration is derived for ferromagnets. Effective Hamiltonian simulations are further conducted to realistically compute such field in an asymmetric permalloy ring. It is found that Eint mostly consists of short pulses that are correlated with the rapid temporal change of the magnetic toroidal moment in this low-dimensional ferromagnet, thus providing macroscopic information about the dynamical change of magnetic vortices. Discussion about the connection between Eint and some electric fields recently mentioned in the literature is also provided.
Prosandeev
S
S
Physics Department, University of Arkansas, Fayetteville, Arkansas 72701, USA.
Bellaiche
L
L