Simultaneous spin-based Boolean logic operations with reprogrammable functionality

Abstract

exploiting spin polarized transport or integrated magnetic fields PACS 72.25.-b -Spin polarized transport PACS 85.75.Ff -Reprogrammable magnetic logicAbstract -Construction of parallel logic gates at nano-scale level undoubtedly improves the efficiency of computable operations. In this work we put forward a new idea of designing two distinct logical operations simultaneously in the two output leads of a three-terminal bridge setup which on one hand is highly stable as all the results are valid for a wide range of parameter values and on the other hand easy to engineer. Our system can be reprogrammed to have all the twoinput logic gates with two operations at a time by selectively choosing the physical parameters describing the system, viz, Rashba spin-orbit (SO) interaction, magnetic flux, and Fermi energy. Finally, we explore the possible storage mechanism as well using our model.

Non-volatile reconfigurable spin logic device: parallel operations

“…This is completely new and has not been attempted so far in literature. Another new concept is that, contrary to the earlier recent proposal of designing parallel logic gates [20] where at most two logic functions can be obtained simultaneously at the two outgoing terminals, here we can perform a large number of logic operations, as many as we wish, repeating the identical or dissimilar logic gates, considering a single setup. The limitation of two logical operations in the earlier proposition was mainly due to the fact that the output response is measured in terms of transport current, but this issues is completely eliminated in our present case where we measure the output signal by bias driven spin dependent circular current.…”

“…Designing of logic gates where everything is spin based is of great impact, and the efficiency will be enhanced significantly if we can achieve the parallel operations as well. Though some efforts have been made to fabricate nano-scale logic gates, very less amount of works is available so far where parallel operations are explored [15][16][17][18][19][20][21], and thus further probing with a comprehensive discussion is undoubtedly required to have suitable functional operations. This is the primary motivation behind our work.…”

“…Because of this fact multiple operations are performed, all at a time, and the wiring in the circuits largely decreases which eventually reduces power consumption significantly. In reference [20], the spin-dependent scattering is obtained by means of spin-orbit (SO) coupling. Since this coupling is usually too weak, it is quite hard to produce a considerable separation between the up and down spin channels, and this is the primary requirement to have better spin dependent transport phenomena.…”

Non-volatile reconfigurable spin logic device: parallel operations

“…Designing of logic gates where everything is spin based is of great impact, and the efficiency will be enhanced significantly if we can achieve the parallel operations as well. Though some efforts have been made to fabricate nanoscale logic gates, very less amount of works is available so far where parallel operations are explored [15][16][17][18][19][20][21] , and thus further probing with a comprehensive discussion is undoubtedly required to have suitable functional operations. This is the primary motivation behind our work.…”

“…In Ref. 20 , the spin-dependent scattering is obtained by means of spin-orbit (SO) coupling. Since this coupling is usually too weak, it is quite hard to produce a considerable separation between the up and down spin channels, and this is the primary requirement to have better spin dependent transport phenomena.…”