Abstract
Magnetization of NbTi multifilamentary wires with copper matrix was measured using a SQUID magnetometer in a range of temperature 4.5 – 8.0 K under external magnetic fields B e up to 1 T applied parallel to the wire axis. The twisting of the wire is considered to exert an inverse effect on the magnetization value of the proximity-effected wire in parallel fields and in perpendicular fields. Critical current densities of proximity-induced superconducting matrix J cp in parallel field were estimated from the peak-like magnetization appearing at B e ≃ 0. The decrease in M with increasing the twist-pitch l p of the wire, contrary to the perpendicular field case, is attributed to the decrease in shielding current density which is a vector sum of J cp and superconducting filament current density J f. External field and temperature dependence of J cp were analyzed and also compared with those in perpendicular fields.
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