Magnetic properties and magneto-impedance of cold-drawn permalloy-copper composite wires

The permalloy-copper composite wires consisting of high conductivity Cu inner core and NiFe outer shell were fabricated by a modified cold-drawn technique, The diameter of the Cu inner core was in 20-120 /spl mu/m range, and the NiFe outer shell was 10-40 /spl mu/m thick. The composite wires exhibit...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1999-09, Vol.35 (5), p.3640-3642
Main Authors: Antonov, A.S., Rakhmanov, A.L., Buznikov, N.A., Prokoshin, A.F., Granovsky, A.B., Perov, N.S., Usov, N.A.
Format: Article
Language:English
Subjects:
Amorphous magnetic materials
Amorphous materials
COMPOSITES
Conductivity
Copper
Core wire
ELECTRICAL CONDUCTIVITY
Frequency
IMPEDANCE
INTERMETALLIC COMPOUNDS
Intermetallics
IRON COMPOUNDS
Magnetic anisotropy
Magnetic cores
MAGNETIC PROPERTIES
Magnetoimpedance
NICKEL ALLOYS (50 TO 99 NI)
Nickel base alloys
NICKEL COMPOUNDS
Perpendicular magnetic anisotropy
Soft magnetic materials
WIRE
Wires
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Summary:The permalloy-copper composite wires consisting of high conductivity Cu inner core and NiFe outer shell were fabricated by a modified cold-drawn technique, The diameter of the Cu inner core was in 20-120 /spl mu/m range, and the NiFe outer shell was 10-40 /spl mu/m thick. The composite wires exhibit soft magnetic behavior and the giant magneto-impedance effect. The amplitude of the giant magneto-impedance at high frequencies is comparable to that of conventional amorphous wires and significantly larger than that of NiFe wires without Cu inner core. Nevertheless, the sensitivity of these wires does not reach the theoretical predictions based on the simple models for composite wires with the axial or circumferential types of magnetic anisotropy.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.800616