Metallic Ferromagnet of La0.5Sr0.5MnO3 with Negative Permittivity and Permeability. (5th November 2021)

• Record Type: Journal Article
• Authors: Yan, Kelan; Shen, Liming; Yin, Feng; Qi, Guicun; Zhang, Xiaohong; Fan, Runhua; Bao, Ningzhong
• Is Part Of: Advanced Electronic Materials. Volume 8:Number 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-05
• Subjects: metamaterials -- negative permeability -- negative permittivity -- perovskite; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.202101020
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Since the electromagnetic metamaterials are artificial materials with subwavelength‐scale periodic architectures, they can manipulate electromagnetic waves by exhibiting unusual properties of characteristic negative permittivity ε and permeability μ. However, their fabrication toward reducing the anisotropy for the realization of practical metamaterials is still a challenge. A homogeneous La0.5 Sr0.5 MnO3 with negative properties synthesized by a facile method consisting of the sol–gel method and pressure‐less sintering is proposed in this paper. By appropriately tuning e g electrons concentration, lattice symmetry, and magnetic resonance, the La0.5 Sr0.5 MnO3 can simultaneously achieve negative ε and μ at the frequency range of 575–650 MHz. Experimental results and theoretical simulation suggest that negative ε is attributed to the plasma oscillation of e g electrons and high lattice symmetry, whereas the magnetic resonance causes the negative μ. The enhancement is due to the reduction of the eddy current and the effective magnetic anisotropy. An important step toward the development of natural compound metamaterials is represented in this paper. Abstract : Double negative properties, i.e., negative permittivity and permeability, can be realized simultaneously in La0.5 Sr0.5 MnO3 at the frequency range of 575–650 MHz by increasing the lattice symmetry and the magnetic resonance, due to the reduction of the eddy current. This novel "natural" single‐phase compound metamaterial is of unique homogeneity and provides a new strategy for extending the scope of electromagnetic metamaterials.