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Magnetization and magnetoresistance of common alloy wires used in cryogenic instrumentation



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


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.
Review of Scientific Instruments


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