Growth and Characterization of Ferrite-High Temperature Superconductor Thin Films for Microwave Devices.

摘要

In an effort to integrate superconducting, conducting, ferrite and insulating thin films to produce microwave devices such as phase shifters and circulators, thin films (single and bi-layer) of ferrites (Strontium Hexaferrite, Fe3O4), superconductors (YBa2Cu3O7-x), buffer layers (MgO), and ground planes (SrRuO3, CaRuO3) were grown by the technique of laser ablation on semiconducting (Si, GaAs), ferrite (YIG), and insulating (LaAlO3) substrates. All films grown were epitaxial as shown by 4 circle x-ray diffractometry. The magnetic properties of the films were characterized by magnetometry and by FMR. 4 wire resistance measurements were used to characterize the superconducting properties.