1. spintronics By
C.ANIL KUMAR (07AG1A0411)

2. INDEX Introduction Logic Of Spin Spintronic Devices
Computing With Spin
Advantages
Future Prospect
Conclusion

3. Introduction
As electronic devices become smaller, quantum properties of the wavelike nature of electrons are no longer negligible
Conventional electronic devices ignore the spin property and rely strictly on the transport of the electrical charge of electrons
Adding the spin degree of freedom provides new effects, new capabilities and new functionalities
Spintronic devices offer the possibility of enhanced functionality, higher speed, and reduced power consumption

4. Logic of spin
Spin relaxation
Spin transport

5. Spintronic devices

6. 1.Giant Magnetoresistive(GMR)
sandwich structure
Alternating ferromagnetic and non
magnetic metal layers
parallel and perpendicular current

7. 2. Datta -das spin transistor
Emitter and collector are ferromagnetic
with parallel magnetizations
The gate provides magnetic field
Current is modulated by the degree of
precession in electron spin

8. Spin based quantum computing
Quantum bit or qubits
Entanglement
A-gates & J-gates

9. Advantages
Information is stored into spin as one of two possible orientations
Spin lifetime is relatively long, on the order of nanoseconds
Spin currents can be manipulated
Spin devices may combine logic and storage functionality eliminating the need for separate components
Magnetic storage is nonvolatile
Binary spin polarization offers the possibility of applications as qubits in quantum computers

10. applications

11. Future prospects In Material science-Many methods of magnetic doping
Large magneto resistance in ferromagnetic semiconductor tunnel junctions.

12. conclusion
These "Spintronic" devices might lead to quantum computers and quantum communication based on electronic solid-state devices, thus changing the perspective of information technology in the 21st century.
A new class of device based on the quantum of electron spin, rather than on charge, may yield the next generation of microelectronics

13. references Bennett, C. H., and D. P. DiVincenzo. 2000.
Quantum information and computation.
Nature (404):267.
Das Sarma, S., et al Theoretical perspectives
on spintronics and spin-polarized
transport. IEEE Transactions on Magnetics

14. Any queries ?

15. Thank you