That external electric fields can reorient the electric polarization of these materials makes them ideal for certain memory applications, such as stored-value cards used in mass-transit systems.
Another difference between stored-value cards and debit cards is that debit cards are usually issued in the name of individual account holders, while stored-value cards are usually anonymous.
Besides debit cards linked to a bank account, there exist also stored-value cards (prepaid debit cards) with and without the possibility to recharge them.