The Group of Magnetism and Magnetic Materials (GMMM) (UPV / EHU) has always maintained an open research line focused on the application of magnetic materials to sensor or actuator devices. This is possible due to properties such as magnetostriction, magnetoelasticity, magnetoimpedance or magnetoresistance, exhibited by many magnetic materials.
The main objective of this research line is to design magnetic sensors based on the coupling of physical properties with magnetism, such as magneto-impedance (MI) and magneto-elastic (ME) effects. Our research is focused in the following property-based sensors:
MI property based sensors. MI takes advantage of the huge changes in the electrical impedance of soft magnetic materials and provides excellent sensitivities to very small magnetic fields.
ME property based sensors. The ME effect arises when a mechanical action generates a magnetic change within the magnetic material, and vice versa. If this material is driven to resonance, this characteristic resonace frequency is extremely sensitive to many external physical parameters (pressure, humidity, mass deposition, among others).
Multifunctional materials based sensors. The combination of magnetic materials with good magnetostrictive behaviour combined with piezoelectric materials, gives as result magnetoelectric composites that are also multifunctional materials with outstanding sensitivity for sensors and excellent performance as energy harvesters.