Compact magnetic field amplification by tuned Lenz lens

Tajabadi, A. M.A.A.S., Dehghani, P., Assi, D. S., Karthikeyan, V. , Huang, C.-B., Abbas, H. T. and Roy, V. A.L. (2023) Compact magnetic field amplification by tuned Lenz lens. IEEE Sensors Journal, (doi: 10.1109/JSEN.2023.3297254) (Early Online Publication)

Abstract

High-frequency magnetic field sensing is a vital feature of several biomedical and industrial applications. Typically, highly sensitive magnetic materials are used for such applications, yet such materials are expensive and their development is bespoke. Recently, there has been an increased interest to reshape magnetic fields to design high-performance sensing devices. In this paper, we present and evaluate the design of a Lenz lens-based miniaturised magnetic field sensor onto a single substrate. We envision that our device can be used for magnetic field based sensing applications. Through simulations, we show that the introduction of a Lenz lens confines and enhances the magnetic field in the region of the sensor. Our design is validated using laboratory measurements that show a 40-fold improvement in the detected signal at 28.6 MHz when a Lenz lens is placed around the sensor. We also note that the enhancement leads to a 15 dB increase in the signal-to-noise ratio of the detected signal. We fabricated the design using etching techniques that are both well-known and low-cost, therefore, showing potential for mass-scale production. We demonstrate that it is not only possible to create a device that enhances magnetic field sensitivity, but also to do so in a manner that makes it easy to integrate with existing technologies. The latter feature allows it to become immediately useful for a variety of NMR applications.

• Item Type: Articles
• Status: Early Online Publication
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Tajabadi, Ataollah and Abbas, Dr Hasan and Karthikeyan, Dr Vaithinathan and Assi, Dani and Dehghani, Miss Parisa and Vellaisamy, Professor Roy
• Authors: Tajabadi, A. M.A.A.S., Dehghani, P., Assi, D. S., Karthikeyan, V., Huang, C.-B., Abbas, H. T., and Roy, V. A.L.
• College/School: College of Science and Engineering > School of Engineering; College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Sensors Journal
• Publisher: IEEE
• ISSN: 1530-437X
• ISSN (Online): 1558-1748
• Published Online: 27 July 2023
• Copyright Holders: Copyright © 2023 IEEE
• First Published: First published in IEEE Sensors Journal 2023
• Publisher Policy: Reproduced in accordance with the publisher copyright policy