What is Magnetic semiconductor?

Magnetic semiconductors are semiconductor materials that exhibit both ferromagnetism and useful semiconductor properties. If implemented in devices, these materials could provide a new type of control of conduction. Whereas traditional electronics are based on control of charge carriers , practical magnetic semiconductors would also allow control of quantum spin state. This would theoretically provide near-total spin polarization , which is an important property for spintronics applications, e.g. spin transistors.