Projects per year
Abstract
The nonreciprocal magnetoelectric effect, also known as the Tellegen effect, promises a number of groundbreaking phenomena connected to fundamental (e.g., electrodynamics of axion and relativistic matter) and applied physics (e.g., magnetless isolators). We propose a three-dimensional metamaterial with an isotropic and resonant Tellegen response in the visible frequency range. The metamaterial is formed by randomly oriented bi-material nanocylinders in a host medium. Each nanocylinder consists of a ferromagnet in a single-domain magnetic state and a high-permittivity dielectric operating near the magnetic Mie-type resonance. The proposed metamaterial requires no external magnetic bias and operates on the spontaneous magnetization of the nanocylinders. By leveraging the emerging magnetic Weyl semimetals, we further show how a giant bulk effective magnetoelectric effect can be achieved in a proposed metamaterial, exceeding that of natural materials by almost four orders of magnitude.
Original language | English |
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Article number | 1293 |
Journal | Nature Communications |
Volume | 15 |
Issue number | 1 |
DOIs | |
Publication status | Published - Dec 2024 |
MoE publication type | A1 Journal article-refereed |
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DeCAP: Designer Composites with Axionic Properties
Asadchy, V. (Principal investigator), Safaei Jazi, S. (Project Member) & Amrahi Iniolya, B. (Project Member)
01/09/2023 → 31/08/2027
Project: Academy of Finland: Other research funding
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PREIN: Photonics Research and Innovation
Mäkelä, K. (Principal investigator)
01/01/2019 → 31/12/2022
Project: Academy of Finland: Other research funding
Equipment
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Aalto Electronics-ICT
Ryynänen, J. (Manager)
Department of Electronics and NanoengineeringFacility/equipment: Facility
Press/Media
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The Magic Behind True One-Way Glass: A Breakthrough in Optical Metamaterials
29/02/2024
1 item of Media coverage
Press/Media: Media appearance