Spintronics is a branch of electronics that uses the intrinsic spin of electrons, in addition to their charge, to process and store information. In conventional electronics, only charge matters: currents flow because electrons move. Spintronics exploits the fact that electrons have a magnetic moment with two main orientations, often called “up” and “down,” which can encode information in a robust and energy efficient way.

A central theme in spintronics research is generating and controlling spin polarized currents. This often relies on materials with strong spin dependent properties, such as ferromagnets and certain semiconductors or insulators. Devices like magnetic tunnel junctions use ultra thin insulating barriers between magnetic layers so that electron tunneling depends on spin orientation. This underpins modern magnetic random access memory, where information is stored as the relative alignment of magnetic layers.

Another key focus is understanding and exploiting spin currents without net charge flow. Spin orbit coupling, present in many materials, allows charge currents to produce transverse spin currents and vice versa. Effects such as the spin Hall effect and the Rashba effect provide mechanisms to convert between spin and charge signals and to move domain walls or manipulate magnetization using electrical pulses rather than magnetic fields.

The research also explores materials that maintain spin coherence over long distances, including specially engineered heterostructures, topological materials and low dimensional systems. The long term vision is combining logic, memory and communication in integrated spin based technologies that are faster, more compact and far more energy efficient than traditional charge based electronics.