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Proceedings Paper

Effect of stoichiometry on sensing behavior of iron-gallium
Author(s): Jayasimha Atulasimha; Alison B. Flatau; Inderjit Chopra; Rick A. Kellogg
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Paper Abstract

Iron-Gallium alloys demonstrate moderate magnetostriction (~350 ppm) and saturation material induction (~1 T) under low magnetic fields (~400 Oe) as well as high tensile strength (~500 MPa) and limited dependence of magnetomechanical properties on temperatures between -20°C and 80°C, making them promising materials for sensing and actuation applications. However, the mechanical and magnetic properties of these materials vary significantly with the percentage of gallium, which motivates this study on the effect of stoichiometry on the behavior of Fe-Ga alloys. Major loop compressive tests (loading to 110 MPa and unloading, at magnetic fields ranging from 0 to 891 Oe) were performed on single crystal 19% Ga and 24% Ga samples with longitudinal axis in the [100] direction. The effect of % Ga on Young's modulus, saturation magnetization (Msat), ΔE-effect and d*33 are discussed and explained. Furthermore, it was found that the magnetic field (H) through the sample changed with applied stress. A simple magnetic circuit analysis is developed in the latter part of the paper to model this effect. The ramification of both stoichiometry effects and variation in field on the design of Fe-Ga sensors is discussed.

Paper Details

Date Published: 21 July 2004
PDF: 11 pages
Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); doi: 10.1117/12.539397
Show Author Affiliations
Jayasimha Atulasimha, Univ. of Maryland/College Park (United States)
Alison B. Flatau, Univ. of Maryland/College Park (United States)
Inderjit Chopra, Univ. of Maryland/College Park (United States)
Rick A. Kellogg, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 5387:
Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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