A Single Magnetic Particle with Nearly Unlimited Encoding Options

Language
en
Document Type
Article
Issue Date
2021-09-13
First published
2021-07-15
Issue Year
2021
Authors
Müssig, Stephan
Reichstein, Jakob
Prieschl, Johannes
Wintzheimer, Susanne
Mandel, Karl
Editor
Publisher
Wiley-VCH GmbH
Abstract

Abstract Communicating objects are demanded for product security and the concepts of a circular economy or the Internet of Nano Things. Smart additives in the form of particles can be the key to equip objects with the desired materials intelligence as their miniaturized size improves applicability and security. Beyond their proposed identification by optical signals, magnetic signals deriving from magnetic particles can hypothetically be used for identification but are to date only resolved roughly. Herein, a magnetic particle‐based toolbox is reported, that provides more than 77 billion (77 × 109) different magnetic codes, adjustable in one single particle, that can be read out unambiguously, easily, and quickly. The key towards achieving the vast code variety is a hierarchical supraparticle design that is inspired by music: similarly to how the line‐up variation of a musical ensemble yields distinguishable overtones, the variation of the supraparticle composition alters their magnetic overtones. By minimizing magnetic interactions, customizable signals are spectrally decoded by the simple method of magnetic particle spectroscopy. A large number of chemically adjustable magnetic codes and the possibility of their remote, contactless detection from within materials is a breakthrough for unexploited labeling applications and pave the way towards materials intelligence.

Journal Title
Small
Volume
17
Issue
28
Citation
Small 17.28 (2021): 2101588. <https://onlinelibrary.wiley.com/doi/10.1002/smll.202101588>