Abstract
Amorphous magnetic microwires can be suitable for a variety of technological applications due to their excellent magnetic softness and giant magnetoimpedance (GMI) effect. Several approaches for optimization of soft magnetic properties and GMI effect of magnetic microwires covered with an insulating, flexible, and biocompatible glass coating with tunable magnetic properties are overviewed. The high GMI effect and soft magnetic properties, achieved even in as-prepared Co-rich microwires with a vanishing magnetostriction coefficient, can be further improved by appropriate heat treatment (including stress-annealing and Joule heating). Although as-prepared Fe-rich amorphous microwires exhibit low GMI ratio and rectangular hysteresis loops, stress-annealing, Joule heating, and combined stress-annealed followed by conventional furnace annealing can substantially improve the GMI effect (by more than an order of magnitude).
Highlights
We present trends related to optimization of soft magnetic properties and giant magnetoimpedance (GMI) effect of amorphous glass magnetic microwires suitable for various technological applications
We summarized the magnetic properties and GMI performance of amorphous magnetic glass-coated microwires and the methods that allow for improving magnetic softness and GMI effect
Magnetic softness and GMI effect of microwires with a vanishing magnetostriction coefficient can be substantially improved by appropriate annealing
Summary
Magnetic functional cost-effective materials with tunable magnetic properties and reduced dimensions are highly demanded by numerous technological applications, such as sensors, security electronic surveillance, microelectronics, medicine, automobile and aircraft industries, energy harvesting and conversion, home entertainment, electrical engineering, magnetic recording, magnetic memories, etc. [1,2,3,4,5,6]. Almost all reported GMI applications involve the use of magnetically soft amorphous wires with vanishing magnetostriction coefficient, λs [16,18,33,34,35,36] Another peculiar feature of amorphous magnetic wires is spontaneous magnetic bistability associated with magnetization reversal through single and large Barkhausen jump and perfectly rectangular hysteresis loops [41,42,43]. We present trends related to optimization of soft magnetic properties and GMI effect of amorphous glass magnetic microwires suitable for various technological applications.
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