Dynamic response in a finite size composite multiferroic thin film

Abstract

Composite multiferroics, heterostructures of ferromagnetic (FM) and ferroelectric (FE) materials, are characterized by a remarkable magnetoelectric effect at the interface. Previous work has supported the ferromagnetic structure with magnetic spins and the ferroelectric with pseudospins which act as electric dipoles in a microscopic model, coupled with a magnetoelectric interaction [J. Appl. Phys. 118, 124109 (2015)]. In this work, by solving the stochastic Landau-Lifshitz-Gilbert equation, the electric-field-induced magnetization switching in a twisted boundary condition has been studied, and a behavior of domain wall in the ferromagnetic structure is discussed.

Magnetoelectric coupling and the manipulation of magnetic Bloch skyrmions

“…We employ a pseudospin model to solve the dynamical behaviors of electric polarization. 25,26 The local electric moments are replaced by electric pseudospins, shown as P k;l ¼ P x k;l ; P y k;l ; P z k;l that is regarded as a continuous vector, and k; l characterizes the location. The distinction between pseudospins and classical spins is the variable size and absence of precession.…”

“…28 The time evolution of pseudospins is expected to perform a precession free trajectory. 26 Because of the electric dipole moment is a measure of the separation of positive and negative charges along the Ising z direction. It is a scalar.…”