Effect of glass removal on the magnetic behavior of FeSiB glass-covered wires

Abstract

Amorphous magnetic glass-covered wires are of interest for basic research and potential applications. Their specific magnetic behavior originates in their very small diameters and in the high internal stresses induced during preparation. emoval of the glass cover leads to significant changes in their magnet~c ~r o p e r t~e s and behavior, thus improving their suitability for sensing applications. A thorough study of the changes produced by the glass removal implies the consideration of the changes produced in the internal stress distribution. We propose a method for the calculation of the residual internal stress distribution in wires obtained after the glass removal, based on the results of the magnetic measurements. The residual internal stress dis~r~bution allows us to explain the magnetic behavior o f these wires. We also present the advantages of wires obtained after the glass removal from the practical point of view in comparison with those of conventional amorphous wires.

Domain Structure of ‘Thick’ Amorphous Microwires with Nearly Zero Magnetostriction

“…microwires with larger ratios between glass coating thickness and metallic core radius [6]. In the case of sample A, this ratio is 1.97, while in the case of sample B it is 1.33.…”

Rapidly Solidified Magnetic Nanowires and Submicron Wires

“…The large internal stresses induced by both rapid solidification of metal and the difference between the thermal expansion coefficients of metal and glass (Chiriac et al, 1995) give rise to quite large values of the switching field, as shown in Figures 20 and 21. The direct relation between the value of the switching field and the glass to metal ratio is well known (Chiriac et al, 1997). In case of the (Co 0.94 Fe 0.06 ) 72.5 Si 12.5 B 15 samples magnetostriction is much smaller leading to smaller values of the switching field.…”

Magnetic anisotropy in FeSiB amorphous glass-covered wires

“…In these works, magnetic properties of Fe77 sSij sBls AGCMW are analyzed starting from the magnetoelastic coupling between their high positive magnetostriction (1 = 35 x and internal stresses induced during preparation. This coupling leads to a strong magnetoelastic anisotropy which mainly determines their magnetic behavior [4]. The magnetic behavior of Feq7 sSi7,5B15 AGCMW was explained from the point of view of the magnetoelastic anisotropy originating in the coupling between magnetostriction and the diagonal components of the internal stress tensor.…”

“…The aim of this paper is to study the helical anisotropy in Fe77 5Si7.5Bl AGCMW, and the way it affects the known easy axes distribution established for these wires 121, [3], and also to study the torque sensitivity of the magnetic behavior of glass-covered wires and of wires obtained after glass removal"…”

“…Recently, there have been published some new results related to the magnetic behavior of Fe775Si7.5B15 AGCMW [2], [ 3 ] . In these works, magnetic properties of Fe77 sSij sBls AGCMW are analyzed starting from the magnetoelastic coupling between their high positive magnetostriction (1 = 35 x and internal stresses induced during preparation.…”