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

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

2849

Lastpage

2852

Abstract

We report suppression of the critical current of thin film YBa₂Cu₃O₇ layers by altering the magnetization of a ferromagnetic La_0.67Ca_0.33MnO₃ 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; La_0.67Ca_0.33MnO₃ ferromagnetic overlayer; YBa₂Cu₃O₇ superconducting thin film; YBa₂Cu₃O₇-La_0.67Ca_0.33MnO₃; 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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.812035

Filename

1212215