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Publication Citation: Magnetization and magnetoresistance of common alloy wires used in cryogenic instrumentation

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Author(s): Mike Abrecht; Andrew Adare; John (. Ekin;
Title: Magnetization and magnetoresistance of common alloy wires used in cryogenic instrumentation
Published: April 16, 2007
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
Pages: pp. 046104-1 - 046104-3
Keywords: Constantan;copper alloys;magnetization;magnetoresistance;Manganin;Nichrome;phosphor bronze
Research Areas: Electromagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (252KB)