SPINTRONICS

By

C.ANIL KUMAR (07AG1A0411)

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

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

LOGIC OF SPIN Spin relaxation Spin transport

SPINTRONIC DEVICES

1.GIANT MAGNETORESISTIVE(GMR)

sandwich structure Alternating ferromagnetic and non magnetic metal layers parallel and perpendicular current

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

SPIN BASED QUANTUM COMPUTING Quantum bit or qubits Entanglement A-gates & J-gates

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

APPLICATIONS

FUTURE PROSPECTS In Material science-Many methods of

magnetic doping Large magneto resistance in

ferromagnetic semiconductor tunnel junctions.

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

REFERENCESBennett, C. H., and D. P. DiVincenzo. 2000.Quantum information and computation.Nature (404):267. Das Sarma, S., et al. 2000. Theoretical

perspectiveson spintronics and spin-polarizedtransport. IEEE Transactions on Magnetics

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