Superconducting Properties of Thick Films on Hastelloy Prepared by the Aerosol Deposition Method With Ex Situ MgB2 Powder

We present a new high-deposition-rate coating technique that allows us to produce at room temperature long thick films of MgB2on flexible steel substrates. Such a technique might give rise to new tapes with higher filling factors compared to the standard processed tapes. With the so-called aerosol deposition technique, MgB2films were prepared on Hastelloy substrates with commercially available ex situ-prepared MgB2powder (TC,onsetof 38 K, JC of 3.8·103A/cm2at 4 K and 1 T). Microscopic analyses yield nanocrystalline dense films with high film stresses. The as-deposited films have so far a superconducting transition temperature TC0of 18.1 K and a critical current density JCup to 5·103A/cm2at 4 K and self-field obtained.