Reduced thermal stability of antiferromagnetic nanostructures

Levente Rózsa, Severin Selzer, Tobias Birk, Unai Atxitia and Ulrich Nowak PHYSICAL REVIEW B100, 064422 (2019) DOI: 10.1103/PhysRevB.100.064422

Abstract: Antiferromagnetic materials hold promising prospects in novel types of spintronics applications. Assessing thestability of antiferromagnetic nanostructures against thermal excitations is a crucial aspect of designing deviceswith a high information density. Here we use theoretical calculations and numerical simulations to determinethe mean switching time of antiferromagnetic nanoparticles in the superparamagnetic limit. It is demonstratedthat the thermal stability is drastically reduced compared to ferromagnetic particles in the limit of low Gilbertdamping, attributed to the exchange enhancement of the attempt frequencies. It is discussed how the systemparameters have to be engineered in order to optimize the switching rates in antiferromagnetic nanoparticles.