Ferromagnetic Film on a Superconducting Substrate
Superconductivity
2009-10-31 v1 Materials Science
Abstract
We study the equilibrium domain structure and magnetic flux around a ferromagnetic (FM) film with perpendicular magnetization M_0 on a superconducting (SC) substrate. At 4{\pi}M_0<H_{c1} the SC is in the Meissner state and the equilibrium domain width in the film, l, scales as (l/4{\pi}{\lambda}_{L}) = (l_{N}/4{\pi}{\lambda}_{L})^{2/3} with the domain width on a normal (non-superconducting) substrate, l_{N}/4\pi\lambda_L >> 1. Here \lambda_L is the London penetration length. For 4{\pi}M_0 > H_{c1} and l_{N} in excess of about 35 {\lambda}_{L}, the domains are connected by SC vortices. We argue that pinning of vortices by magnetic domains in FM/SC multilayers can provide high critical currents.
Cite
@article{arxiv.cond-mat/0007159,
title = {Ferromagnetic Film on a Superconducting Substrate},
author = {L. N. Bulaevskii and E. M. Chudnovsky},
journal= {arXiv preprint arXiv:cond-mat/0007159},
year = {2009}
}
Comments
4 pages, 2 figures, submitted to PRB