Spintronics is an emerging field that exploits the quantum property of electrons called spin, in addition to their charge, to store, process and transmit information. In conventional electronics, information is encoded by the presence or absence of charge. Spintronics adds another layer by using spin orientation, typically described as “up” or “down”, which can increase functionality while reducing energy consumption.

A central element of spintronics is the ability to create, manipulate and detect spin-polarized currents. This is achieved using ferromagnetic materials, where electron spins tend to align. When such materials are combined with non magnetic layers, they form structures like magnetic multilayers and tunnel junctions that exhibit effects such as giant magnetoresistance and tunneling magnetoresistance. These phenomena underpin existing technologies like modern hard drive read heads and magnetic random access memory, where data are stored in magnetic states rather than electric charge.

Research focuses on improving materials and interfaces to control spin more efficiently and at room temperature. Semiconductor spintronics aims to integrate spin into conventional semiconductor devices, enabling spin-based transistors and logic. Another active area is spin orbitronics, which uses spin orbit coupling to convert charge currents into spin currents and vice versa, facilitating electrical control of spin.

There is also growing interest in antiferromagnetic spintronics, where ordered but oppositely aligned spins promise faster operation and robustness against external magnetic fields. Overall, ongoing work is pushing toward low power, non volatile memory, ultrafast logic, and novel quantum devices that leverage coherent spin states and spin based information processing.