Ferroplasmons: Novel Plasmons in Metal-Ferromagnetic Bimetallic Nanostructures

Abstract

New plasmonic materials are required to enable potential strong coupling of light and magnetism, which could lead to improved data storage and/or completely novel optical materials [1, 2]. Bimetallic materials are a promising new way to realize new and/or better plasmonic behaviors [3, 4]. In this paper we first use high-resolution transmission electron microscopy to present evidence for ferroplasmons, strong surface plasmons that appear in ferromagnetic metals when in the proximity of noble metal nanostructures. To better understand and explore the origin of these ferroplasmons we have developed a simple approach to synthesize electron transparent nanostructuresso asto compare their plasmonic properties by electron energy loss spectroscopy and compare with calculations performed using the discrete dipole approximation (DDA) approach.