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Devices based on antiferromagnetic materials have advantages of robustness to external magnetic fields and the potential for ultrafast operation. Here the authors present a multilevel antiferromagnetic memory cell that can be operated using standard electronic interfaces.
The counterfeiting of goods has economic implications and is a threat to health and security. One promising solution for product authentication is the incorporation of physical unclonable functions. This Review delineates how stochastic chemical processes can afford unique anti-counterfeiting tags that cannot be reproduced.