Thin Vicalloy wires with bistable magnetization states exhibit a fast magnetization reversal when excited by an external magnetic field. The reversal is accompanied by a large Barkhausen jump that is independent on the rate of change of the external field. For indirect observation of the large Barkhausen jump and for many sensor applications, a pickup coil is used in general. The amplitude of the voltage induced in the pickup coil is independent of the change rate of the magnetic field. For direct observation of the magnetization reversal, a magnetic field camera based on the Faraday effect is used to measure the radial magnetic field of the wire. Excitation of the Barkhausen jump is done by a rotating magnet. The radial magnetic structure clearly shows the magnetization reversal of the large Barkhausen jump for very small changes in the magnetization field.

中文翻译：

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直接观察 Vicalloy 细线中的大巴克豪森跳跃

具有双稳态磁化状态的 Vicalloy 细线在被外部磁场激发时表现出快速的磁化反转。反转伴随着与外场变化率无关的大巴克豪森跳跃。对于大巴克豪森跳跃的间接观察和许多传感器应用，通常使用拾音线圈。拾波线圈中感应的电压幅度与磁场的变化率无关。为了直接观察磁化反转，使用基于法拉第效应的磁场相机来测量导线的径向磁场。巴克豪森跳跃的激发是由旋转磁铁完成的。