Antiferromagnetic spintronics

TL;DR

Antiferromagnetic spintronics explores the use of antiferromagnetic materials for information storage and processing, leveraging their insensitivity to external magnetic fields and high-frequency dynamics, with recent advances in manipulation and detection methods.

Contribution

This paper provides a comprehensive overview of recent developments in manipulating and detecting antiferromagnetic states, highlighting their potential advantages for spintronic applications.

Findings

Antiferromagnets are insensitive to external magnetic fields.

High-frequency dynamics of antiferromagnets enable fast information processing.

Recent techniques allow effective manipulation and detection of antiferromagnetic states.

Abstract

Antiferromagnetic materials are magnetic inside, however, the direction of their ordered microscopic moments alternates between individual atomic sites. The resulting zero net magnetic moment makes magnetism in antiferromagnets invisible on the outside. It also implies that if information was stored in antiferromagnetic moments it would be insensitive to disturbing external magnetic fields, and the antiferromagnetic element would not affect magnetically its neighbors no matter how densely the elements were arranged in a device. The intrinsic high frequencies of antiferromagnetic dynamics represent another property that makes antiferromagnets distinct from ferromagnets. The outstanding question is how to efficiently manipulate and detect the magnetic state of an antiferromagnet. In this article we give an overview of recent works addressing this question. We also review studies looking at merits of antiferromagnetic spintronics from a more general perspective of spin-ransport, magnetization dynamics, and materials research, and give a brief outlook of future research and applications of antiferromagnetic spintronics.