title: Negative and near zero refraction metamaterials based on permanent magnetic ferrites.
abstract: Ferrite metamaterials based on the negative permeability of ferromagnetic resonance in ferrites are of great interest. However, such metamaterials face a limitation that the ferromagnetic resonance can only take place while an external magnetic field applied. Here, we demonstrate a metamaterial based on permanent magnetic ferrite which exhibits not only negative refraction but also near zero refraction without applied magnetic field. The wedge-shaped and slab-shaped structures of permanent magnetic ferrite-based metamaterials were prepared and the refraction properties were measured in a near-field scanning system. The negative and near zero refractive behaviors are confirmed by the measured spatial electric field maps. This work offers new opportunities for the development of ferrite-based metamaterials.
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Bi
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Yunsheng
authors.initials: Y
authors.lastname: Guo
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Ji
authors.initials: J
authors.lastname: Zhou
authors.affiliation: College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Guoyan
authors.initials: G
authors.lastname: Dong
authors.affiliation: Aerospace Research Institute of Special Materials and Processing Technology, Beijing 100074, China.
authors.forename: Hongjie
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Department of Precision Instrument, School of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Department of Precision Instrument, School of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Zongqi
authors.initials: Z
authors.lastname: Xiao
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Liu
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Chuwen
authors.initials: C
authors.lastname: Lan