Phys.org February 14, 2024
The nonreciprocal magnetoelectric effect, also known as the Tellegen effect, promises several groundbreaking phenomena connected to fundamental and applied physics. An international team of researchers (Finland, Sweden, USA – University of Pennsylvania, Stanford University) proposed a three-dimensional metamaterial with an isotropic and resonant Tellegen response in the visible frequency range. The metamaterial was formed by randomly oriented bimaterial nanocylinders in a host medium. Each nanocylinder consisted of a ferromagnet in a single-domain magnetic state and a high-permittivity dielectric operating near the magnetic Mie-type resonance. The proposed metamaterial required no external magnetic bias and operated on the spontaneous magnetization of the nanocylinders. By leveraging the emerging magnetic Weyl semimetals, they showed how a giant bulk effective magnetoelectric effect could be achieved in a proposed metamaterial, exceeding that of natural materials by almost four orders of magnitude… read more. Open Access TECHNICAL ARTICLE
Characteristic signatures in the cross-polarized light scattering… Credit: Nature Communications volume 15, Article number: 1293 (2024)