Nanomagnet Logic Gate With Programmable-Electrical Input

Abstract

We report a clock/logic/input structure for nanomagnet logic (NML) that implements a two-input slant-based OR gate with both clocking and input programming through current pulses. The clock line is a copper conductor embedded in a Si substrate with CoFe as a flux concentrator. Inputs are implemented with overlaid and dedicated bias lines. The programmability of such inputs allows us to test the same NML device for all possible input combinations. Results are determined by magnetic force microscopy. This scheme is easy to fabricate and can control thicker (20-30 nm) input nanomagnets. Close proximity of bias lines in such a structure allows us to investigate the effect of overlapping bias fields. We also report micromagnetic simulations that relate the slant in the output magnet to the dimensions of the input nanomagnets required to effect proper logic operation.Index Terms-Nanomagnet logic (NML), on-chip integration, programmable input.

Nanomagnetic logic based runtime Reconfigurable area efficient and high speed adder design methodology

“…P3: If the length of nanomagnet is increased along its easy axis, it also increases its coercivity in that direction and the fringing field interactions between nanomagnets allow the nanomagnet to settle in its relaxed state. P4: To re-evaluate a magnetic circuit (reversing the atomic dipoles), higher or lower field is required to switch more dipoles resulting in a net vector (Up  or Down ) along that axis [23,27].…”

“…Subsequently, a full adder architecture has been proposed using pipelined three input magnets [20]. Along side, researchers focused on the shape (S) engineering [21][22][23], programmable inputs [23][24][25][26][27][28], positional (P) anisotropy [29] and SP hybrid anisotropy [30] of the nanomagnets pertaining towards enhanced area optimization and robustness. Adder implementation using slanted edge inputs [31] and 45°positioned [32] nanomagnets have been demonstrated.…”