Polaritons in magnetoelectric multiferroics films: Switching magnon polaritons using an electric field

ABSTRACT

We present a theoretical study of polarions on the magnetoelectric multiferroics with finite thickness (film) geometry. The multiferroics are ferroelectric-antiferromagnet with canted spin structure. Dispersion relation for surface and bulk polaritons are calculated for the case of transverse electric (TE) polarization. Example results are presented using parameters appropriate for BaMnF₄. It is found that bulk polaritons posses discreet character due to the film geometry. We also found that there are two branches of surface polaritons which are reciprocal. Example results for attenuated total reflection (ATR) are also presented. Analyzing the ATR reflection, we found that the branches of surface polaritons are able to be switched by applying an electric field opposite to the polarization.

KEYWORDS:

• Magnetoelectric multiferroic
• switching
• polaritons

Funding

We wish to acknowledge the support of Kementrian Riset, Teknologi dan Pendidikan Tinggi for the funding of this research.through the scheme of Riset Fundamental.