Giant Stress Impedance Magnetoelastic Sensors Employing Soft Magnetic Amorphous Ribbons

• Published in: Materials Vol. 13; no. 9; p. 2175
• Main Authors: Beato-López, Juan Jesús, Urdániz-Villanueva, Juan Garikoitz, Pérez-Landazábal, José Ignacio, Gómez-Polo, Cristina
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 08.05.2020; MDPI
• Subjects: Amorphous alloys; Anisotropy; cross-section characterization; Electric contacts; GSI effect; Impedance; Magnetic fields; Magnetic permeability; Magnetic properties; magnetoelastic coupling; magnetoelastic sensors; magnetostriction; Mechanical properties; Metallic glasses; Modulus of elasticity; Permeability; Positioning devices (machinery); Rapid quenching (metallurgy); Sensors; soft magnetic amorphous alloys; Tensile strength; United States > US; cross-section characterization; soft magnetic amorphous alloys; magnetoelastic sensors; magnetostriction; magnetoelastic coupling; GSI effect; liquid flow meter sensor
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma13092175

Soft magnetic amorphous alloys obtained via rapid quenching techniques are widely employed in different technological fields such as magnetic field detection, bio labeling, non-contact positioning, etc. Among them, magnetoelastic applications stand out due to excellent mechanical properties exhibited by these alloys, resulting from their amorphous structure, namely, their high Young modulus and high tensile strength. In particular, the giant stress impedance (GSI) effect represents a powerful tool to develop highly sensitive magnetoelastic sensors. This effect is based on the changes in the high-frequency electric impedance as the result of the variation in magnetic permeability of the sample under the action of mechanical stresses. In this work, the GSI effect is analyzed in two soft magnetic ribbons ((Co Fe ) Si B and (Co Fe ) Si B ) for the subsequent development of two practical devices: (i) the characterization of the variations in the cross-section dimensions of irregularly shaped elements, and (ii) the design of a flow meter for measuring the rate of flow of water through a pipe.