Film Types

Ceraco can adjust the composition of YBCO films in order to supply the best suited material for our customer´s applications. For that reason we offer two different film types which show significant difference in surface morphology and are used for different applications. We call them S-Type and M-Type films.

Here is additional information about the film types:

S-Type films

The workhorse in HTS technology is YBCO with YBa₂Cu₃O₇ as chemical formula. In reality a slight Copper excess is preferred in order to get optimized super­conducting properties. The surplus of Copper results in small copperoxide precipitates on the surface of the YBCO film. We call such films S-Type as they are often used in the field of superconducting electronics, like SQUIDs or SQIFs. Typically the patterned linewidth here is in the range of few microns only.

M-Type films

For most microwave, power or MRI applications the typical linewidth is larger than 10µm and so the surface roughness is not crucial. In such cases we prefer also to add Yttrium which leads to incorporation of tiny Y₂O₃ particles in the films that act as pinning centers. Such films show highest critical current density and low surface resistance. As a result of the Yttrium excess, the films appear porous. We name such films M-Type, what comes from "Microwave"