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Magnetization and magnetoresistance of common alloy wires used in cryogenic instrumentation

Published

Author(s)

Mike Abrecht, Andrew Adare, John (Jack) W. Ekin

Abstract

We present magnetization and magnetoresistance data at liquid-helium and liquid-nitrogen temperatures for wire materials commonly used for instrumentation wiring of specimens, sensors, and heaters in cryogenic probes. The magnetic susceptibilities in Systeme International units at 4.2 K were found to be: Manganin 1.25x10-2, Nichrome 5.6x10-3, and phosphor bronze -3.3x10-5, indicating that phosphor bronze is the most suitable for high-field applications. We also show the ferromagnetic hysteresis loop of Constantan wire at liquid-helium temperature. The magnetoresistance of these four wires was relatively small: the changes in resistance at 4 K due to a 10 T transverse magnetic field are -2.56% for Constantan, -2.83% for Manganin, +0.69% for Nichrome, and +4.5% for phosphor bronze, compared to about +188% for a typical copper wire under the same conditions.
Citation
Review of Scientific Instruments
Issue
046104

Keywords

Constantan, copper alloys, magnetization, magnetoresistance, Manganin, Nichrome, phosphor bronze
Created April 16, 2007, Updated February 19, 2017