SPINTRONICS

SPINTRONICS

ABSTRACT

Spintronics (short for spin-based-electronics) is new emerging field of basic and applied research in commercial electronics and engineering where "neglected" magnetic degree of freedom of an electron—its spin—is envisaged to be exploited for classical and quantum information processing. It is based on controlling the spin of electrons within tiny structures made of ultra-thin layers. The advantages are due to the fact that all spintronic devices are based on sensing the magnetic field produced by spin rather than movement of electron. The difference in the number of densities of states of spin-up and spin-down electrons can result in computers that store more data in less space, process data faster, and consume less power. ‘Magnetic RAM’ based on ‘Magnetic Tunnel Junction’ can retain their state even when the power is turned off. Similarly, in a spintronic FET flipping of an electron's spin takes much less energy and can be done much faster than pushing an electron out of the channel. Spin Bipolar Transistor can also be used as magnetic field sensor by bonding the MBT(Metal Base Transistor . In this paper, we have suggested two proposals -(1)Concept of high current gain spin based HBT(Hybrid Bipolar Transistor) (2)Multi level data storage and processing which will decrease the total system cost and power consumption, and increase the system speed. In the future, spin accumulation can be used to create magnetic fields needed to store data on next generation hard disk drives, which will increase the total capacities indefinitely.

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