Enhancement of the Josephson current by an exchange field in superconductor-ferromagnet structures

Дата и время публикации : 2001-02-01T15:52:18Z

Авторы публикации и институты :
F. S. Bergeret
A. F. Volkov
K. B. Efetov

Ссылка на журнал-издание: Phys. Rev. Lett. 86, 3140-3143 (2001)
Коментарии к cтатье: to be published in PRL
Первичная категория: cond-mat.supr-con

Все категории : cond-mat.supr-con

Краткий обзор статьи: We calculate the dc Josephson current for two superconductor-ferromagnet (S/F) bilayers separated by a thin insulating film. It is demonstrated that the critical Josephson current $I_{c}$ in the junction strongly depends on the relative orientation of the effective exchange field $h$ of the bilayers. We found that in the case of an antiparallel orientation, $I_{c}$ increases at low temperatures with increasing $h$ and at zero temperature has a singularity when $h$ equals the superconducting gap $Delta $. This striking behavior contrasts suppression of the critical current by the magnetic moments aligned in parallel and is an interesting new effect of the interplay between superconductors and ferromagnets.

Category: Physics