Composite magnetostrictive materials for advanced automotive magnetomechanical sensors
R. W. McCallum, K. W. Dennis, D. C. Jiles, J. E. Snyder, and Y. H. Chen
Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
Received January 24, 2001
In this paper we present the development of a composite magnetostrictive material for automotive applications. The material is based on cobalt ferrite, CoO×2O3, and contains a small fraction of metallic matrix phase that serves both as a liquid phase sintering aid during processing and enhances the mechanical properties over those of a simple sintered ferrite ceramic. In addition the metal matrix makes it possible to braze the material making the assembly of a sensor relatively simple. The material exhibits good sensitivity and should have high corrosion resistance while at the same time it is low cost.