Spin dynamics in driven composite multiferroics

Abstract

A spin dynamics approach has been used to study the behavior of the magnetic spins and the electric pseudo-spins in a 1-D composite multiferroic chain with a linear magneto-electric coupling at the interface. The response is investigated with either external magnetic or electric fields driving the system. The spin dynamics is based on the Landau-Lifshitz-Gilbert equation. A Gaussian white noise is later added into the dynamic process to include the thermal effects. The interface requires a closer inspection of the magnetoelectric effects. Thus we construct a 2-D ladder model to describe the behavior of the magnetic spins and the electric pseudo-spins with different magneto-electric couplings.

Magneto-electric effect for multiferroic thin film by Monte Carlo simulation

“…But converting the number of the Monte Carlo configurations to the real time has to be based on an assumption. However, the spin dynamics approach [1][2][3]5] and the Landau phenomenological theory [1,2,27] can easily solve this problem. Additionally, this system can also be driven by an external electric field, and shows a magnetic response in the magnetic material as well [1,3,5].…”

“…Each magnetic spin and electric dipole has three degrees of freedom. Thus, a simple electric pseudo-spin model [3,5,[17][18][19] describes the electric dipoles as the pseudo-spins. The ME effect occurs at the interface, where g represents the ME coupling (yellow wall).…”

“…and, The ME effect at the interface has been considered as a result of a linear coupling [1][2][3]5]. Eq.…”

“…Recently, the magneto-electric (ME) effect in thin multiferroic films has been investigated theoretically [1][2][3][4][5][6][7][8][9] and experimentally [10,11]. Our understanding the nature of the ME effect has two origins.…”

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.…”