Title :
Longitudinal and transverse coiled giant magnetoimpedance transducers principle, modeling and performances
Author :
Moutoussamy, J. ; Coillot, C. ; Chanteur, G. ; Alvès, F.
Author_Institution :
LPP, Velizy, France
Abstract :
New Giant Magneto-Impedance structures are studied both experimentally and theoretically. These transducers are made with one or two anisotropic nanocrystalline ribbons and the magnetic excitation is provided by coils mounted either in transverse or longitudinal direction. Very high sensitivities up to 1000 V/T have been achieved even at low excitation frequencies from 5 kHz to 500 kHz and low consumption driving current (5-10 mA). The eddy current phenomenon and magnetic domain considerations are used to determine a semi-theoretical model of impedance. Intrinsic sensitivity computation approach emphasizes on the role of the differential magnetic permeability in coiled GMI detection performances.
Keywords :
eddy currents; giant magnetoresistance; magnetic domains; magnetic permeability measurement; magnetoresistive devices; transducers; anisotropic nanocrystalline ribbons; coiled GMI detection; current 5 mA to 10 mA; differential magnetic permeability; eddy current; frequency 5 kHz to 500 kHz; longitudinal coiled giant magnetoimpedance transducer; magnetic domain; magnetic excitation; semitheoretical impedance model; transverse coiled giant magnetoimpedance transducer; Anisotropic magnetoresistance; Coils; Eddy currents; Frequency; Impedance; Magnetic anisotropy; Magnetic domains; Permeability; Perpendicular magnetic anisotropy; Transducers; Coiled GMI; differential magnetic permeability; intrinsic sensitivity;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems Conference, 2009. TRANSDUCERS 2009. International
Conference_Location :
Denver, CO
Print_ISBN :
978-1-4244-4190-7
Electronic_ISBN :
978-1-4244-4193-8
DOI :
10.1109/SENSOR.2009.5285499
