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We report on the superior vortex pinning of single and multilayerBa(Fe1-xCox)2As2 thin films with self-assembled c-axis and artificiallyintroduced ab-plane pins. Ba(Fe1-xCox)2As2 can accept a very high density ofpins (15-20 vol%) without Tc suppression. The matching field is greater than 12T, producing a significant enhancement of the critical current density Jc, analmost isotropic Jc (Theta,20T) > 10^5 A/cm2, and global pinning force densityFp of about 50 GN/m^3. This scenario strongly differs from the high temperaturecuprates where the addition of pins without Tc suppression is limited to 2-4vol%, leading to small HIrr enhancements and improved Jc only below 3-5 Tesla.

Artificial and self-assembled pinning centers in Ba(Fe1-xCox)2As2 thin films as a route to very high current density