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2 April 2008 Magnetomechanical coupling factor and energy density of single crystal iron-gallium alloys
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Energy density and coupling factor are widely used as figures of merit for comparing different active materials. These parameters are usually evaluated as material constants assuming a linear behavior of the material over all operating ranges. In this work it is shown that the operating conditions have an effect on the energy density and coupling factor which cannot be ignored. A single crystal rod of Fe84Ga16 was characterized as a magnetostrictive actuator and sensor under different quasi-static stress and magnetic field conditions. The material showed a saturation magnetostriction of 247 με and a maximum stress sensitivity of 45 T/GPa. A maximum energy density of 2.38 kJ/m3 and coupling factor higher than 0.6 were calculated from experimental results. The experimental behavior was modeled using an energy based non-linear approach which was further used to calculate the coupling factor and energy density as continuous functions of stress and magnetic field in the material. Guidelines on optimal operating conditions for magnetostrictive actuators and sensors using FeGa alloys have been suggested.
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Supratik Datta and Alison B. Flatau "Magnetomechanical coupling factor and energy density of single crystal iron-gallium alloys", Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 69291Z (2 April 2008);

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