Novel GMR Sensor for Estimation of Magnetic Nanoparticles inside Minute Cavities

Utilization of magnetic nanoparticles in biomedicine has seen an unprecedented growth in recent years. The ability to accurately estimate magnetic nanoparticles inside small areas of the body provides an advantage in hyperthermia therapy, a form of cancer treatment. This paper concentrates on a novel giant magnetoresistance (GMR) needle-type sensor to detect and estimate low concentration magnetic fluid inside minute agar cavities injected with magnetic fluid. Theoretical analysis, experimental results and information on the fabricated GMR needle-type sensor are reported. The experimental results show a favorable agreement to the analytical analysis, supporting the potential use of the GMR needle-type sensor in hyperthermia therapy.