Abstract
This paper presents the results of the Villari effect study in FeGa magnetorheological composites with very low stresses. The composites consist of a silicone matrix and Fe75Ga25 powder of size ranging from 50 to 100 \(\upmu \hbox {m}\). Two types of composites, one is with 45 wt% and the other one with 30 wt% of Fe75Ga25 powder have been manufactured. The Villari effect has been measured in both samples as-manufactured and in those in which a 1 T magnetic field has been applied after curing. The results indicate that the composites with an applied field of 1 T after curing show the greatest Villari signal even without any applied magnetic field. This fact allows a design of a low-cost force sensor and high performance. A simple model, based on the change in the cross-section of the composite, has been developed to explain the results obtained.
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Acknowledgements
This work was supported in part by the Principality of Asturias governments under grant GRUPIN 14-037. We are grateful to Dr D Martínez, in charge of Magnetic Measurements and the X-ray Diffraction of the Scientific Services of the University of Oviedo.
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Riesgo, G., Elbaile, L., Carrizo, J. et al. Villari effect in silicone/FeGa composites. Bull Mater Sci 42, 238 (2019). https://doi.org/10.1007/s12034-019-1926-x
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DOI: https://doi.org/10.1007/s12034-019-1926-x