<prompt> MRI magnet is aFerromagnetParamagnetSimple magnetSuperconducting-magnet  <response>: MRI uses a Superconducting magnet which is kept cool using Helium. A superconducting MRI magnet comprises a steel cryostat with the superconducting coils immersed in liquid helium at 4.2 Kelvin -269degC or -452degF. 