%0 Journal Article
%T A high security coding and anti-counterfeiting method based on the nonlinear magnetization response of superparamagnetic nanomaterials.
%A Bai S
%A Lin Y
%A Wang X
%A Zhang X
%A Yoshida T
%A Yue X
%J Sci Rep
%V 14
%N 1
%D 2024 Jul 4
%M 38965281
%F 4.996
%R 10.1038/s41598-024-65450-1
%X Traditional coding methods based on graphics and digital or magnetic labels have gradually decreased their anti-counterfeiting because of market popularity. This paper presents a new magnetic anti-counterfeiting coding method. This method uses a high-performance coding material, which, along with small changes to the material itself and the particle size of the superparamagnetic nanomaterials, results in a large difference in the nonlinear magnetization response. This method, which adopts 12-site coding and establishes a screening model by measuring the voltage amplitude of 12-site variables, can code different kinds of products, establishing long-term stable coding and decoding means. Through the anti-counterfeiting experiment of wine, the experiment results show that the authenticity of the coded products can be verified using the self-developed magnetic encoding and decoding system. The new coding technology can verify the anti-counterfeiting of 9000 products, with a single detection accuracy of 97% and a detection time of less than one minute. Moreover, this coding method completely depends on the production batch of the superparamagnetic nanomaterials, which is difficult to imitate, and it provides a new coding anti-counterfeiting technology for related industries with a wide range of potential applications.