Abstract
Parametric properties of a magnetostrictive oscillator are characterized by observing the strain dynamics of a magnetically excited metallic glass ribbon. A magnetostrictive ribbon excited by a total magnetic field H=H/sub dc/+h/sub p/ cos( omega t)+h/sub Omega / cos( Omega t) generates strain responses at frequencies omega , Omega , omega +or- Omega , thereby making the device resemble a parametric oscillator operating in the three-photon mode. Close to an instability in the nonlinear strain dynamics of such materials, the authors observed dependence of the gain of the strain e/sub Omega / on pump amplitude h/sub p/ and detuning frequency, while DC field dependent gain was observed in the strain e/sub omega +or- Omega /. This behavior is generic to parametric devices and is not predicted by the quadratic coherent rotation model of magnetostriction. Experimental verification of greater than 35-dB small signal gain in a fiber-optic AC magnetometer is demonstrated.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Published Version
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