Beato López, Juan JesúsLa Roca, Paulo MatíasAlgueta-Miguel, Jose M.Garayo Urabayen, EnekoSánchez-Alarcos Gómez, VicenteRecarte Callado, VicenteGómez Polo, CristinaPérez de Landazábal Berganzo, José Ignacio2023-09-192023Beato-López, J. J., La Roca, P., Algueta-Miguel, J. M., Garaio, E., Sánchez-Alarcos, V., Recarte, V., Gómez-Polo, C., & Pérez-Landazábal, J. I. (2023). Monitoring structural transformations in metamagnetic shape memory alloys by non-contact GMI technology. Smart Materials and Structures, 32(10), 105032. https://doi.org/10.1088/1361-665X/acf6e90964-172610.1088/1361-665X/acf6e9https://academica-e.unavarra.es/handle/2454/46370Different applications based on metamagnetic shape memory alloy (MSMA) require monitoring the evolution of the martensitic transformation (MT) to optimize the actuation mechanism. To avoid interaction with the active material, a non-contact technique would be ideal. Nevertheless, non-contact detection involves complex methods like diffraction, optical analysis, or electromagnetic technology. The present work demonstrates that the MT can be monitored without interaction with the active material using a low-cost technology based on the Giant Magnetoimpedance (GMI) effect. The GMI sensor is based on a (CoFe)SiB soft magnetic wire submitted to an alternating current and whose second harmonic voltage variation allows to detect changes in the strength of the stray magnetic fields linked to the metamagnetic phase transition. The sensor has been tested using the MT of a NiMnInCo MSMA. A specific application for environmental temperature control using the non-contact GMI sensor is proposed.application/pdfeng© 2023 IOP Publishing Ltd.Metamagnetic shape memory alloy (SMA)Giant magnetoimpedance effect (GMI)Phase transitionMagnetic sensorElectronic interfaceCodification-decoding information processArtículo / Artikulua2023-09-19Acceso embargado / Sarbidea bahitua dagoinfo:eu-repo/semantics/embargoedAccess