Nickel Ferrite Nano fluid Functionalized Tapered Microfiber Based Magnetometer

Abstract Considering the promising utility of devices operating for high magnetic fields in noninvasive medical diagnostic applications such as magnetic resonance imaging, a microfiber-based magnetometer operating for an extensive dynamic range actuated via NiFe2O4 ferrite fluid is presented and proposed for the first time in this paper. NiFe2O4 nanoparticles with a mean diameter of 37 nm (derived from Debye–Scherer’s formula) are prepared usingthe sol-gel process to fabricate the magnetometer. Various scientific approaches are utilized to explore these nanoparticles’ structural, optical, morphological, and magnetic features. Optimized lower concentration (~2%) of the nanofluid is used in the surrounding environment of the fiber interferometer to measure an extensive range of magnetic field up to ~ 600 mT. The sensor can detect a diverse range of magnetic fields with a maximum sensitivity of 18 pm/mT. The operating range of a reported sensor can be extended further by applying a voltage source with finer tunability.