Physical properties of nearly zero magnetostriction Co-rich glass-coated amorphous microwires

Magnetic and mechanical properties of Go-rich amorphous microwires of nomin al compositions (Co1-xMnx)(75)Si-10 B-15 (0.08 < x < 0.11) and Co56.5Fe6.5N i10B16Si11 with nearly zero magnetostriction constant have been studied. Dr astic changes of the hysteresis loop with the decrease of x from rectangula r to flat shape were observed at x < 0.1, while the Co56.5Fe6.5Ni10B16Si11 microwire showed rectangular hysteresis loops. Compositions with x greater than or equal to 0.1 have small but positive magnetostriction constant whil e negative lambda(s) values have been observed at x less than or equal to 0 .09, indicating rectangular character of the hysteresis loop in samples wit h nearly zero and even for small negative lambda(S). External stress depend ence of switching field, H*, showed an increase of H* with sigma for sample s with x = 0.11 and a decrease of H* with sigma for x = 0.1. Besides, micro wires of the same composition but with different dimensions showed differen t H*(sigma) dependencies.