Magnetostriction in glass-coated magnetic microwires

摘要: Abstract The hysteretic magnetic properties of glass coated microwires depend on the magnetostriction constant: Co-rich with negative constant present an almost non-hysteretic loop relatively high anisotropy field up to around 8 kA/m. In contrast, Fe-rich positive show rectangular hysteresis loops switching depending diameter metallic nucleus and thickness coating. softest properties, such as large permeability, are observed in nearly zero magnetostrictive alloys. It is then obvious that experimental determination saturation λ s glass-coated very important predict their behaviour. Different methods for tiny have been reviewed compared this manuscript. Small angle magnetization rotation (SAMR) method change giant magneto-impedance spectrum under applied stress employed as-prepared current annealed glass-covered microwires. conditions applicability these analysed, taking into account domain structure expected vanishing nucleus. These different techniques give similar values. Heat treatment results a significant .