Abstract
The idea of nanomagnetic Boolean logic was advanced more than two decades ago. It envisaged the use of nanomagnets with two stable magnetization orientations as the primitive binary switch for implementing logic gates and ultimately combinational/sequential circuits. Enthusiastic proclamations of how nanomagnetic logic will eclipse traditional (transistor-based) logic circuits proliferated the applied physics literature. Two decades later there is not a single viable nanomagnetic logic chip in sight, let alone one that is a commercial success. In this perspective article, I offer my reasons on why this has come to pass. I present a realistic and tempered vision of nanomagnetic logic, pointing out many misconceptions about this paradigm, flaws in some proposals that appeared in the literature, shortcomings, and likely pitfalls that might stymie progress in this field.
Highlights
Traditional logic gates use a transistor as the primitive binary digital switch to implement the conditional dynamics of a gate
A nanomagnetic logic gate is non-volatile and the output bit can be stored in-situ in the gate, eliminating the need to transfer it to a memory bank
The primary reason is the lack of error resilience that magnetic devices suffer from and that preludes their application in state-ofthe-art Boolean logic circuitry
Summary
Traditional logic gates use a transistor as the primitive binary digital switch to implement the conditional dynamics of a gate. If we use the magnetization of a nanomagnet to encode the binary bits, as, we are using a vector quantity whose direction (not magnitude) represents the bit information On the surface it seems that flipping the direction should not require any current flow (and no current needs to flow inside the nanomagnet) which would eliminate any energy dissipation associated with current flow when we switch. It has three layers shaped like elliptical disks. It accomplished this with buffers and additional circuit overhead, which compromises circuit density, among other things
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