Abstract
Stress-annealing enabled a considerable improvement in the GMI effect in both Fe- and Co-rich glass-coated microwires. Additionally, a remarkable magnetic softening can be achieved in stress-annealed Fe-rich microwires. Observed stress-annealing induced magnetic anisotropy is affected by annealing conditions (temperatures and stresses applied during annealing). The highest GMI ratio up to 310% was obtained in stress-annealed Co-rich microwires, although they presented rectangular hysteresis loops. A remarkable magnetic softness and improved GMI ratio over a wide frequency range were obtained in stress-annealed Fe-rich microwires. Irregular magnetic field dependence observed for some stress-annealing conditions is attributed to the contribution of both the inner axially magnetized core and outer shell, with transverse magnetic anisotropy.
Highlights
IntroductionEffect [1,2,3] and fast propagation of a single domain wall (DW) [4,5]
Magnetic wires exhibit versatile physical properties such as the Giant Magnetoimpedance (GMI)effect [1,2,3] and fast propagation of a single domain wall (DW) [4,5]
From Z-values obtained for different magnetic fields, H, we evaluated the magnetic field dependences of the GMI ratio, ∆Z/Z, which is defined as follows:
Summary
Effect [1,2,3] and fast propagation of a single domain wall (DW) [4,5] These properties are not solely restricted to amorphous magnetic wires [3,6], the former family presents several advantages, like better mechanical properties [7,8] as well as a fast and inexpensive preparation method involving rapid solidification from the melt [9,10,11]. From the viewpoint of applications, excellent magnetic field sensitivity of the GMI effect reported for soft magnetic wires (up to 10 %/A/m) is certainly of great technological interest [12,13,14,15]. Specific magnetic structures containing arrays of amorphous magnetic wires allow us to achieve high sensitivity of the surface impedance to external stimuli and are useful for development of tunable metamaterials and metacomposites [30,31,32]
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