Optimizing NV magnetometry for Magnetoneurography and Magnetomyography applications
Chen Zhang, Jixing Zhang, Matthias Widmann, Magnus Benke, Michael Kübler, Durga Bhaktavatsala Rao Dasari, Thomas Klotz, Leonardo Gizzi, Oliver Röhrle, Philipp Brenner, Jörg Wrachtrup
Abstract
Magnetometers based on color centers in diamond are setting new frontiers for sensing capabilities due to their combined extraordinary performances in sensitivity, bandwidth, dynamic range, and spatial resolution, with stable operability in a wide range of conditions ranging from room to low temperatures. This has allowed for its wide range of applications, from biology and chemical studies to industrial applications. Among the many, sensing of bio-magnetic fields from muscular and neurophysiology has been one of the most attractive applications for NV magnetometry due to its compact and proximal sensing capability. Although SQUID magnetometers and optically pumped magnetometers (OPM) have made huge progress in Magnetomyography (MMG) and Magnetoneurography (MNG), exploring the same with NV magnetometry is scant at best. Given the room temperature operability and gradiometric applications of the NV magnetometer, it could be highly sensitive in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mtext>pT</mml:mtext><mml:mo>/</mml:mo><mml:msqrt><mml:mrow><mml:mtext>Hz</mml:mtext></mml:mrow></mml:msqrt></mml:math> -range even without magnetic shielding, bringing it close to industrial applications. The presented work here elaborates on the performance metrics of these magnetometers to the state-of-the-art techniques by analyzing the sensitivity, dynamic range, and bandwidth, and discusses the potential benefits of using NV magnetometers for MMG and MNG applications.