Patent ID: 7583173

Claim:
A wound nanocrystallised core without a localised air gap comprising a nanocrystalline material of atomic composition: [Fe 1-a Ni a ]100x-y-z-α-β-γCu x Si y B z Nb α M′ β M″ γ with a≦0.3, 0.6≦x≦1.5, 10≦y≦17, 5≦z≦14, 2≦α≦6, β≦7, γ≦8, M′ being at least one of the elements V, Cr, Al and Zn, M″ being at least one of the elements C, Ge, P, Ga, Sb, In and Be having a permeability μ is greater than 1000 and less than or equal to 4000, a saturation of more than 1 T, an induction range in which the permeability does not vary by more than 5% higher than 0.9 T, a remanent induction of less than 0.02 T and a cut-off frequency above 1 MHz, and such that μ varies by less than 1% when the core is subjected to 100 hours ageing at more than 100° C., μ, varies by less than 5% when the core is coated, μ varies by less than 15% when the temperature varies between −25° C. and +60° C., and less than 25% when the temperature varies between −40° C. and +120° C., and in that μ varies regularly and almost linearly with temperature between −40° C. and +120° C.