Negative Refraction in Ferromagnet/Superconductor Superlattices

Abstract

Negative refraction, which reverses many fundamental aspects of classical optics, can be obtained in systems with negative magnetic permeability and negative dielectric permittivity. This Letter documents an experimental realization of negative refraction at millimeter waves, finite magnetic fields and cryogenic temperatures utilizing a multilayer stack of ferromagnetic and superconducting thin films. In the present case the superconducting YBa_2Cu_3O_7 layers provide negative permittivity while negative permeability is achieved via ferromagnetic (La:Sr)MnO_3 layers for frequencies and magnetic fields close to the ferromagnetic resonance. In these superlattices the refractive index can be switched between positive and negative regions using external magnetic field as tuning parameter.

4 Pages, 3 Figures, Phys. Rev. Lett., accepted

References in corpus (8)

• Refraction at Media with Negative Refractive Index
• Polarizabilities and Effective Parameters for Collections of Spherical Nano-Particles Formed by Pairs of Concentric Double-Negative (DNG), Single-Negative (SNG) and/or Double-Positive (DPS) Metamaterial Layers
• The negative index of refraction demystified
• Theoretical investigation on the possibility of preparing left-handed materials in metallic magnetic granular composites
• Terahertz Conductivity at the Verwey Transition in Magnetite
• Restricted equivalence of paired epsilon-negative and mu-negative layers to a negative phase-velocity material ({\em alias} left-handed material)
• Spin dynamics in La_{1-x}Sr_{x}MnO_{3} (x \le 0.175) investigated by high-field ESR spectroscopy
• Frequency dependent relaxation rate in the superconducting YBa2Cu3O{6+delta}

Cited by in corpus (12)

• Electrodynamics of Correlated Electron Materials
• Tuning the Resonance in High Temperature Superconducting Terahertz Metamaterials
• The Physics and Applications of Superconducting Metamaterials
• Gate-tunable negative refraction of mid-infrared polaritons
• Negative refraction in hyperbolic hetero-bicrystals
• Layered superconductors as negative-refractive-index metamaterials
• Holographic Optics and Negative Refractive Index
• Refractive index in holographic superconductors
• Wide-Band Tuneability, Nonlinear Transmission, and Dynamic Multistability in SQUID Metamaterials
• Interplay of magnetization dynamics with microwave waveguide at cryogenic temperatures
• Negative refraction in natural ferromagnetic metals
• Antiferromagnetic resonances in superconductor-ferromagnet multilayers