Title :
Critical current control in a superconducting thin film with a ferromagnetic layer
Author :
Allsworth, M.D. ; Chakalov, R.A. ; Mikheenko, P. ; Colclough, M.S. ; Muirhead, C.M.
Author_Institution :
Sch. of Phys. & Astron., Univ. of Birmingham, UK
fDate :
6/1/2003 12:00:00 AM
Abstract :
We report suppression of the critical current of thin film YBa2Cu3O7 layers by altering the magnetization of a ferromagnetic La0.67Ca0.33MnO3 overlayer. We provide evidence that the critical current suppression is related to the spin-polarized state of the magnetic layer, rather than a direct magnetic influence. We argue that the spin diffusion length in the superconducting layer is small compared with the typical domain size in the ferromagnetic layer in its demagnetized state.
Keywords :
barium compounds; calcium compounds; critical currents; electron spin polarisation; ferromagnetic materials; high-temperature superconductors; lanthanum compounds; magnetisation; spin dynamics; superconducting thin films; yttrium compounds; La0.67Ca0.33MnO3 ferromagnetic overlayer; YBa2Cu3O7 superconducting thin film; YBa2Cu3O7-La0.67Ca0.33MnO3; critical current; demagnetized state; domain size; magnetization; spin diffusion length; spin polarized state; Colossal magnetoresistance; Critical current; High temperature superconductors; Magnetic domains; Magnetic materials; Magnetization; Superconducting epitaxial layers; Superconducting magnets; Superconducting materials; Superconducting thin films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812035
