Hello,

My name is Radu Jubleanu, I am PhD student at the Politehnica University of Bucharest. I work in the field of magnetic storage in superconductors, I studied some works related with superconductors , and I have a confusion related to the magnetic anisotropy of them.

More precisely, I would like a clarification, related to parallel and perpendicular magnetic fields. I saw that there are Jc curves as a function of B. But it is not clear to me who is B. Who produces this external magnetic field?

Thank you!