High frequency properties of glass-coated microwire

Static and high-frequency 1-30 MHz properties of the (Co100-xMnx)(75)B15Si1 0 microwires cast using the modified Taylor's technique are reported. The h ysteresis loop and the frequency dependence of permeability indicate that t he longitudinal magnetization process occurs by coherent rotation of the mo ments. The values of static permeability are in good agreement with those p redicted by the theory of ferromagnetic resonance where damping is taken in to account. We observed a close correlation between the static permeability and the high-frequency limit (the frequency up to which the real part of p ermeability is still constant). For glass-coated CoMn microwires, this limi t is considerably higher than that given by the Snoek equation. (C) 1998 Am erican Institute of Physics.