Titanium’s magnetic susceptibility is very small Titanium's electrical conductivity is very small even better with an oxidation layer. <---- All that Fe causes resistance as you travel through earth's magnetic field. Titanium's weight to strength ratio is better than steel Titanium is the best material for your application! < I came to this conclusion while I was researching how to focus strong magnetic fields) Along the lines of said motor! < Still can be improved!>
Why do you think they use it for flying saucers???! ;-)