All Spin Logic device with inbuilt Non-Reciprocity

TL;DR

This paper proposes an all-spin logic device with built-in non-reciprocity, enabling directed information transfer without complex clocking, using spin-torque physics and coupled spin-transport/magnetization models.

Contribution

It introduces a novel ASL-based scheme that inherently exhibits non-reciprocity, demonstrated through simulations and heuristic explanations.

Findings

Single ASL unit shows non-reciprocal switching behavior.

Engineered ASL devices can be cascaded to form circuits.

Model validated with experimental benchmarks.

Abstract

The need for low power alternatives to digital electronic circuits has led to increasing interest in logic devices where information is stored in nanomagnets. This includes both nanomagnetic logic (NML) where information is communicated through magnetic fields of nanomagnets and all-spin logic (ASL) where information is communicated through spin currents. A key feature needed for logic implementation is non-reciprocity, whereby the output is switched according to the input but not the other way around, thus providing directed information transfer. The objective of this paper is to draw attention to possible ASL-based schemes that utilize the physics of spin-torque to build in non-reciprocity similar to transistors that could allow logic implementation without the need for special clocking schemes. We use an experimentally benchmarked coupled spin-transport/ magnetization-dynamics model to show that a suitably engineered single ASL unit indeed switches in a non-reciprocal manner. We then present heuristic arguments explaining the origin of this directed information transfer. Finally we present simulations showing that individual ASL devices with inbuilt directionality can be cascaded to construct circuits.