Simulation of the Faraday effect for the core–shell magnetic nanowire

Abstract

In this paper, the core–shell magnetic nanowire was described by classical Heisenberg model with single-ion anisotropy and its Faraday effect was simulated by means of Landau–Lifshitz–Gilbert (LLG) equation. The results show that the resonance behavior of the nanowire appears in the circularly polarized microwave field. When the microwave frequency is higher than the resonance frequency of the nanowire, there is obvious Faraday effect in the nanowire, and the rotation angle for different frequencies is almost a constant value, and the value decreases as the temperature increases. In a microwave field with fixed frequency, the Faraday rotation angle changes with the internal magnetic structure of the nanowire, and shows a trend consistent with the magnetization curve. Therefore, we can regulate the Faraday effect of the nanowire by changing their magnetic structure or applying external magnetic field.