Abstract
The magnetic properties of Fe- and Co-based amorphous and nanocrystalline glass-coated microwires are reviewed. Such wires are composed of a metallic amorphous nucleus (3 to 20 μm diameter) and an insulating glass cover (2 to 12 μm thick). Interest is mainly focused on samples exhibiting squared hysteresis loops (magnetically bistable) which exhibit positive magnetostriction (bistability can be observed for 2 mm long samples). The internal stresses are much stronger than for in-rotating-water quenched amorphous wires as a consequence of the presence of the glass coating and, coupled with magnetostriction, give rise to strong magnetoelastic anisotropies determining the magnetization process. Upon heating, the structure evolves to nanocrystalline and microcrystalline and although the magnetic behavior remains bistable a large influence on the switching field is observed (variations of switching field between 0.3 and 100 Oe). These magnetic properties make such microwires very promising for technological applications.
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