Ferromagnetic Film on a Superconducting Substrate
Abstract
We study the equilibrium domain structure and magnetic flux around a ferromagnetic (FM) film with perpendicular magnetization M0 on a superconducting (SC) substrate. At 4πM0<Hc1 the SC is in the Meissner state and the equilibrium domain width in the film, l, scales as (l/4πλL) = (lN/4πλL)2/3 with the domain width on a normal (non-superconducting) substrate, lN/4πλL >> 1. Here λL is the London penetration length. For 4πM0 > Hc1 and lN in excess of about 35 λL, 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.
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