Colossal stability of antiferromagnetically exchange coupled nanomagnets

TL;DR

This paper demonstrates that antiferromagnetically exchange coupled nanomagnets exhibit exceptional thermal stability at low dimensions, especially under correlated noise, promising advancements in high-density non-volatile storage and logic devices.

Contribution

It reveals that AFM coupled nanomagnets are more thermally stable than FM ones at small scales, especially under correlated noise, using stochastic LLG simulations.

Findings

AFM coupled nanomagnets show higher stability than FM ones.

Correlated noise significantly enhances AFM nanomagnet stability.

Potential for high-density non-volatile memory applications.

Abstract

Bistable nanomagnets store a binary bit of information. Exchange coupled nanomagnets can increase the thermal stability at low dimensions. Here we show that the antiferromagnetically (AFM) coupled nanomagnets can be highly stable at low dimensions than that of the ferromagnetically (FM) coupled nanomagnets. By solving stochastic Landau-Lifshitz-Gilbert equation of magnetization dynamics at room temperature, we analyze the stability of the exchange coupled nanomagnets in the presence of correlated, uncorrelated, and anti-correlated noise. The results show that the correlated noise can make the stability of the AFM coupled nanomagnets very high. Such finding will lead to very high-density non-volatile storage and logic devices in our future information processing systems.