According to what I read online, the DC comic specifies Moljinr as an Asgardian metal, which brought up another topic altogether. Being a metal of alien nature, does Magneto still have control over it? Does it conduct a current, or is something different altogether? If it does indeed conduct a current, I believe Magneto could have some effect on the hammer. Whether or not he could lift it is still in question. We know Graviton was able to prevent Thor from picking the hammer up with his abilities, but that was also not picking it up.