Abstract
The magnetic structure of Wiegand wires cannot be evaluated using conventional magnetization hysteresis curves. We analyzed the magnetization reversal of a Wiegand wire by measuring the first-order reversal curves (FORCs). A FeCoV Wiegand wire with a magnetically soft outer layer and a hard magnetic core was used in this study. The magnetization reversal of the soft and hard regions in the wire was identified in the FORC diagrams. The magnetization reversal of the dominantly irreversible process of the soft layer and the magnetic intermediate region between the soft and hard regions was clarified.
Highlights
A Barkhausen jump, called the Wiegand effect, refers to the rapid reversal in magnetization of magnetic wires with bistable states [1,2]
The coercive force on the outer layer of such wires is reduced under the large stress that occurs during the twisting process [5,6], whereas that of the core remains unchanged
The magnetic properties of the Wiegand wire were successfully clarified through a detailed analysis of the prominent features in its first-order reversal curves (FORCs) diagram
Summary
A Barkhausen jump, called the Wiegand effect, refers to the rapid reversal in magnetization of magnetic wires with bistable states [1,2]. Vicalloy, with a typical composition of Fe0.4Co0.5V0.1, has been identified as the optimum material to realize this effect [3]. Such wires are called Wiegand wires, and they are prepared via twisting and annealing processes [4]. Wiegand wires exhibit magnetic structures that can be described as comprising two layers: the magnetically soft outer layer and the hard core, with lower and higher coercive forces, respectively. When a magnetic field with the appropriate intensity and opposite polarity is applied to Wiegand wires, the magnetization reverses, and a pulse voltage with the opposite polarity is generated
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