Skyrmion based 3D low complex runtime reconfigurable architecture design methodology of universal logic gate

Abstract

In this study, we introduce the area efficient low complex runtime reconfigurable architecture design methodology based on Skyrmion logic for universal logic gate (ULG) i.e., NOR / NAND implementation using micromagnetic simulations. We have modelled the two input 3D device structure using bilayer ferromagnet/heavy metal where the magnetic tunnel junctions (MTJs) inject and detect the input and output skyrmions by exploiting the input reversal mechanism. The implementation of NOR and NAND is performed using this same device where it is reconfigured runtime with enhanced tunability by the ON and OFF state of current passing through a nonmagnetic metallic gate respectively. This gate acts as a barrier for skyrmion motion (additional control mechanism) to realize the required Skyrmion logic output states. To the best of authors’s knowledge the boolean optimizations and the mapping logic have been presented for the first time to demonstrate the functionalities of the NOR / NAND implementation. This proposed architecture design methodology of ULG leads to reduced device footprint with regard to the number of thin film structures proposed, low complexity in terms of fabrication and also providing runtime reconfigurability to reduce the number of physical designs to achieve all truth table entries (∼75 % device footprint reduction). The proposed 3D ULG architecture design benefits from the miniaturization resulting in opening up a new perspective for magneto-logic devices.

Reconfigurable Skyrmion-Based Logic Gates: Versatile Design and Full-Scale Implementation

“…demonstrated that VCMA can efficiently control the Néel vector in antiferromagnets with perpendicular anisotropy, enabling coherent excitation and manipulation of AFM order. The first-principles calculations further support these findings, with identified VCMA behavior in ultrathin FeRh/MgO bilayers and in materials like L1 0 -MnPd and MgO-capped MnPt AFM films. − Therefore, the precise manipulation of the electric field emerges as a promising avenue for realizing a reconfigurable logic gate within AFM materials, offering flexibility in performing different logic functions. , Additionally, an essential aspect of skyrmion-based logic gates lies in the interaction between skyrmions themselves in AFM thin films, particularly the sky–sky topological repulsion, highlighting their tunability and potential for logic operations. − Moreover, thoughtful geometric designs are one of the key mechanisms in reconfigurable skyrmion logic gates (RSL) as they grant the ability to exert control over the motion, interaction, and stability of skyrmions, all of which are critical elements for achieving the desired logic operations. , …”