No abstract

Aiming at the requirement of high precision and long life in tasks of mechanical and navigation industries, a highly sensitive and compact, magnetorheological fluid film-suspended nonadiabatic biconical tapered optical fiber interferometer-based vector magnetometer has been proposed and demonstrated in the manuscript. The reported magnetometer keeps the ability to detect the strength of the magnetic field and its direction in the 3D plane concurrently. Magnetically regulated effective index amendment is used to stimulate the higher order modes propagating in the cladding region of the ultrathin biconical fiber interferometer. Hence, the detection principle of the sensor depends on the changes in the effective indices of higher-order excited modes with respect to the applied magnetic field. The proposed magnetometer detects slight angular variations of -2° to +2° in the magnetic field over a broad range from 0 mT to 567 mT by using the azimuth-dependent anisotropic distribution of nanoparticles in the vicinity of the fiber-optic sensor arm. The reported sensor offers to its angular sensitivities of ~ ∓14.68 pm/mT, and ~ ∓11.79 pm/mT at minor inclinations of ∓1° and ∓2° whereas having its maximum sensitivity of ~ 16.48 pm/mT at 0°.

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.

In this study, we have successfully synthesized the Fe3O4@Bi2S3 core shell hierarchical by a simple and quick sono chemical method. The structural and morphological studies of the prepared core shell structure show presence of single phase with flower shaped like structure. The crystalline grain size of prepared core shell structure is obtained as ∼16 nm from the Scherrer’s equation. The UV-Vis Spectroscopy study and IV characterization of the synthesized core shell material is performed to investigate its optical and electrical behavior. The RAMAN analysis exhibits its crystal orientation, phase and binding energy of these synthesized structure. The magnetic characterization of the core shell nanostructure shows a superparamagnetic behavior with a saturation magnetization of 33.5emu/gm at 5K temperature. These prepared core shell structures may act as promising material for broad spectral photo detection, optoelectronic devices and energy storage application.