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Sensors 2014, 14(5), 7602-7624; doi:10.3390/s140507602

Sensor Applications of Soft Magnetic Materials Based on Magneto-Impedance, Magneto-Elastic Resonance and Magneto-Electricity

1,2,* , 1,2
1 Department of Electricity and Electronics, Basque Country University (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain 2 BCMaterials, Technological Park of Biscay, Nº 500, 48160 Derio, Spain 3 ESS Bilbao, Paseo de Landabarri, 48940 Leioa, Spain 4 Intelligent Information Systems, IK4-Tekniker, 20600 Eibar, Spain
* Author to whom correspondence should be addressed.
Received: 21 January 2014 / Revised: 2 April 2014 / Accepted: 15 April 2014 / Published: 25 April 2014
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2013)


The outstanding properties of selected soft magnetic materials make them successful candidates for building high performance sensors. In this paper we present our recent work regarding different sensing technologies based on the coupling of the magnetic properties of soft magnetic materials with their electric or elastic properties. In first place we report the influence on the magneto-impedance response of the thickness of Permalloy films in multilayer-sandwiched structures. An impedance change of 270% was found in the best conditions upon the application of magnetic field, with a low field sensitivity of 140%/Oe. Second, the magneto-elastic resonance of amorphous ribbons is used to demonstrate the possibility of sensitively measuring the viscosity of fluids, aimed to develop an on-line and real-time sensor capable of assessing the state of degradation of lubricant oils in machinery. A novel analysis method is shown to sensitively reveal the changes of the damping parameter of the magnetoelastic oscillations at the resonance as a function of the oil viscosity. Finally, the properties and performance of magneto-electric laminated composites of amorphous magnetic ribbons and piezoelectric polymer films are investigated, demonstrating magnetic field detection capabilities below 2.7 nT.
Keywords: magneto-impedance; magneto-elasticity; magneto-electricity; magnetic sensors magneto-impedance; magneto-elasticity; magneto-electricity; magnetic sensors
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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García-Arribas, A.; Gutiérrez, J.; Kurlyandskaya, G.V.; Barandiarán, J.M.; Svalov, A.; Fernández, E.; Lasheras, A.; de Cos, D.; Bravo-Imaz, I. Sensor Applications of Soft Magnetic Materials Based on Magneto-Impedance, Magneto-Elastic Resonance and Magneto-Electricity. Sensors 2014, 14, 7602-7624.

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