Abstract
There is a pressing need for improving of the high-frequency magneto-impedance effect of cost-effective soft magnetic materials for use in high-performance sensing devices. The impact of the stress-annealing on magnetic properties and high frequency impedance of Fe-rich glass-coated microwires was studied. Hysteresis loops of Fe-rich microwires have been considerably affected by stress- annealing. In stress-annealed Fe- rich microwire we obtained drastic decreasing of coercivity and change of character of hysteresis loop from rectangular to linear. By controlling stress-annealing conditions (temperature and time) we achieved drastic increasing (by order of magnitude) of giant magnetoimpedance ratio. Coercivity, remanent magnetization, diagonal and of-diagonal magnetoimpedance effect of Fe-rich microwires can be tuned by stress-annealing conditions: annealing temperature and time. Observed experimental results are discussed considering relaxation of internal stresses, compressive “back-stresses” arising after stress annealing and topological short range ordering.
Highlights
Studies of magnetic wires have drawn considerable attention to the scientific community over the past few decades due to its immense possibilities for the development of low cost, highly sensitive magnetic sensors and devices[1,2,3,4]
We studied the influence of stress-annealing on magnetic properties and giant magnetoimpedance (GMI) effect of Fe75B9Si12C4 amorphous glass-coated microwires prepared by Taylor-Ulitovky method previously described elsewhere[7,15]
The magnetostriction coefficient of studied microwires has been evaluated using the small angle magnetization rotation method (SAMR) method[60]. Initially this method was developed for amorphous materials in which the magnetization rotation presents the determining role[60], recently we demonstrated the possibility to extend the SAMR method for the case of Fe-rich microwires presenting important contribution of domain wall propagation and designed a novel set-up for SAMR measurements[49]
Summary
Studies of magnetic wires have drawn considerable attention to the scientific community over the past few decades due to its immense possibilities for the development of low cost, highly sensitive magnetic sensors and devices[1,2,3,4]. Among the magnetic properties that considered as the most promising for industrial applications are the giant magnetoimpedance (GMI) as well as controlled domain wall (DW) propagation that can be realized in different families of magnetic wires[1,2,3,4,5,6]. Technological progress in rapid quenching techniques allowed development of a few novel methods suitable for preparation of micrometric and even sub-micrometric cast amorphous wires using either cold-drawn, melt extraction or glass-coated technologies[1,2,5,6,7,11,12,13]. There are a few families of amorphous magnetic wires that can be prepared using different fabrication processes involving rapid quenching from the melt:. (i) Conventional amorphous wires prepared using “in-rotating water” method (diameters of the order of 100 μm)[5,9]. Cold-drawn method is proposed for the diameter reduction[5]
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