Abstract
Magnetic field sensor operating for high magnetic fields plays a critical role in non-invasive medical diagnostic applications such as magnetic resonance imaging. Considering this fact, a microfiber-based magnetometer functioning for a large dynamic range of magnetic field actuated via NiFe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> ferrite fluid is presented and proposed. The relevant technical aspects of the present research and current limitations also have been reviewed. NiFe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> based nanoparticles with an average estimated particle size (using Debye–Scherrer’s formula) of 37 nm have been synthesized by sol-gel method. Various characteristic techniques have been exercised to investigate their structural (morphological), optical, and magnetic properties. The proposed sensing probe optimized for a high range of applied magnetic field intensity up to ~0.6 T has been fabricated using only 2% of the volume concentration of ferrite fluids nanoparticles surrounding the interferometer. The reported sensor exhibits a maximum sensitivity of 18 pm/mT due to alterations in the interference dip wavelength. The operational range of the proposed sensing scheme can be enhanced substantially using a better current source.
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