Design and fabrication of multiferroic based components for magnetic field sensor

Abstract

The multiferroic materials are gaining significant research interest in the current newlinescenario due to the aspiration for development of magnetic field sensors on account newlineof inherent magneto-electric characteristic with higher mechanical, chemical and newlinethermal stability. Despite significant advancements in solid state science and newlinetechnology, a much-awaited scientific breakthrough is indispensable for the newlinedevelopment of a novel material with stronger frequency-temperature dependent newlinepermittivity along with lower dielectric loss resulting in higher electro-mechanical newlinecoupling coefficient for formulation of multiferroic based magnetic field sensor newlineintended for measurement of magnetic field and detection of proximal metal objects. newlineAn elegant solution to this is the assortment, development and fabrication of different newlinemultiferroic compounds through substitution of magnetic rare earth ions (either, newlinedysprosium Dy+3, gadolinium Gd+3, neodymium Nd+3 and samarium Sm+3) in newlineBiFe2O3-PbTiO3 binary solid solution [bismuth ferrite (BiFeO3; BFO): an excellent newlinemultiferroic magneto-electric compound and lead titanate (PbTiO3; PT): an attractive newlinematerial for sensor with piezoelectric property] which would offer the promise for newlinedesigning multiferroic based magnetic field sensors. In order to delineate the newlineeminence of the synthesized solid solution and validate the propensity of the newlinecompound for sensor various structural, morphological, composition analysis along newlinewith temperature-frequency dependent electrical properties such as relative newlinepermittivity, loss tangent, conductivity, impedance, electric modulus as well as newlineleakage current characteristics have been experimentally explored. A comprehensive newlinecomparison between all the prepared magnetic rare earth ion doped BFO-PT newlinecompounds have been accomplished to illustrate the pre-eminence of the capacitive newlinespecimen as a potential multiferroic entity with desired properties for magnetic field newlinesensor device design. The magnetic sensor is designed based on magneto-electric newlinecoupling technology using o