Is the magnetic card made of hard magnetic material or is it made of soft magnetic material? Why?
Is made of magnetic material. Since the magnetic card belongs to the magnetic recording material, the magnetic domain distribution can not be changed by the outside world since it is to achieve the goal of magnetic recording.Hard (permanent magnet) and different materials of soft magnetic materials is that with the external magnetic field changes its domain distribution ability, also is the coercive force.
I know that. The answer is correctThere is always magnetized magnetic hard, soft magnetic in order to strengthen the effect of magnetic field, like the inside of the transformer.
Hard magnetic materialBecause you need to save after writing data.After removal of the external magnetic field, the magnetic properties of soft magnetic materials disappear basically, and data can not be saved.
