Effects of Surface Abrasion on Magnetization of VITROVAC 6025Z Ribbons

Abstract

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The effects of abrading with sandpaper the surface of VITROVAC 6025Z ribbons on the parameters of their <formula formulatype="inline"><tex Notation="TeX">$M$</tex> </formula>-<formula formulatype="inline"><tex Notation="TeX">$H$</tex></formula> loops (the coercive field <formula formulatype="inline"><tex Notation="TeX">$H_{c}$</tex> </formula>, the position of the center <formula formulatype="inline"><tex Notation="TeX">$C$</tex></formula>, etc.) have been investigated. The application of surface fields <formula formulatype="inline"><tex Notation="TeX">$H_{P}$</tex> </formula> (generated by core currents) enabled us to single out the effects of surface domains (surface domain structure (SDS) pinning) and surface irregularities (intrinsic pinning) on domain wall (DW) pinning in abraded and unabraded ribbons. The abrasion enhances the intrinsic DW pinning (increases <formula formulatype="inline"> <tex Notation="TeX">$H_{c}$</tex></formula>) and strongly modifies the SDS pinning which shows up in specific variations of <formula formulatype="inline"> <tex Notation="TeX">$H_{c}$</tex></formula> and <formula formulatype="inline"> <tex Notation="TeX">$C$</tex></formula> with <formula formulatype="inline"> <tex Notation="TeX">$H_{P}$</tex></formula>. In particular, the effect of <formula formulatype="inline"><tex Notation="TeX">$H_{P}$</tex></formula> on surface domain structure (SDS) pinning, which was symmetrical in unabraded ribbon becomes asymmetrical upon abrasion (i.e., different on opposite surfaces). A simple model for the influence of <formula formulatype="inline"><tex Notation="TeX">$H_{P}$</tex> </formula> on magnetization processes in soft magnetic ribbons describes the observed variations of <formula formulatype="inline"><tex Notation="TeX">$H_{c}$</tex> </formula> and <formula formulatype="inline"><tex Notation="TeX">$C$</tex> </formula> with <formula formulatype="inline"><tex Notation="TeX">$H_{P}$</tex> </formula> in both abraded and unabraded ribbons</para>