the difference between a permanent magnet and an electromagnet

 In an electromagnet the magnetic field is created through electric current in a wire-wound coil and strengthened by a soft-iron core.
 As soon as you turn off the power, the soft-iron core loses its magnetization.
 A permanent magnet is made of ferromagnetic material, which is magnetized by a strong external magnetic field.
 The magnetically hard material that is used keeps part of its magnetization after the external magnetic field is turned off

                                        electropermanent magnet system real photo