Title :
On magnetic nanoparticles detection using planar Hall effect sensors
Author :
Volmer, M. ; Avram, Marioara
Author_Institution :
Transilvania Univ. of Brasov, Brasov, Romania
Abstract :
In this paper we present aspects concerning magnetic nanoparticles detection using a planar Hall effect magnetometer, disk-shaped of 1mm diameter, build from a single Permalloy layer, 20 nm thick, deposited on oxidized Si substrate. This device allows us to measure the stray magnetic field generated by superparamagnetic beads which are magnetized by an external field. During the experiments we found strong sensor signal dependence, both in shape and magnitude, with the particles at different positions. The results are explained by means of micromagnetic simulations were magnetostatic interactions between magnetic nanobeads and sensor are clearly highlighted.
Keywords :
Hall effect devices; magnetic field measurement; magnetic sensors; magnetisation; magnetometers; micromagnetics; microsensors; nanoparticles; nanosensors; superparamagnetism; Si; deposition; magnetic nanobead; magnetic nanoparticle detection; magnetization; magnetometer; magnetostatic interaction; micromagnetic simulation; oxidized Si substrate; planar Hall effect sensor; sensor signal dependence; size 1 mm; size 20 nm; stray magnetic field measurement; superparamagnetic bead; Magnetic domains; Magnetic field measurement; Magnetic sensors; Micromagnetics; Perpendicular magnetic anisotropy; Lab-on-Chip; Magnetic sensors; Micromagnetic simulations; Planar Hall Effect; superparamagnetic beads;
Conference_Titel :
Semiconductor Conference (CAS), 2012 International
Conference_Location :
Sinaia
Print_ISBN :
978-1-4673-0737-6
DOI :
10.1109/SMICND.2012.6400774
