Influence of the magnetomechanical pole-effect on the behavior of thin vibrating reeds

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Abstract
It is demonstrated that the vibration frequencies of a magnetized reed can be sensibly affected by a magnetic field, due to the restoring force exerted on the moving pole. A simplified theory of this effect is developed which gives reasonable agreement with experimental observations. The relative importance of the pole‐effect depends on the geometry of the reed and increases with the ratio of length to thickness. The effect decreases rapidly for higher overtones. Unlike the magnetization, the pole‐effect does not saturate but rather increases steadily in post‐saturation fields, where it is conveniently separated from the ΔE‐effect on which it is generally superimposed. For the geometries typically employed in the investigation of liquid‐quenched amorphous alloys, the pole‐effect can be large for the fundamental mode and may be used to determine the temperature dependence of the magnetization. If unrecognized, on the other hand, the pole‐effect can cause anomalies in the magnitude of the apparent elastic constant, and especially in the temperature dependence exhibited in the vicinity of the Curie point.

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