Properties of the commercially available magnetoresistive sensor KMZ10A in the temperature range between 50 and 290 K

• Published in: Cryogenics (Guildford) Vol. 38; no. 2; pp. 187 - 190
• Main Authors: Kaiser, G, Thürk, M, Seidel, P, Dettmann, F, Loreit, U
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1998; Elsevier
• Subjects: Cryogenics, refrigerators; low-temperature techniques; Exact sciences and technology; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; low temperature; Magnetic components, instruments and techniques; magnetoresistive sensor; noise; Physics; resistance; resolution; sensitivity; Thermal instruments, apparatus and techniques; noise; sensitivity; magnetoresistive sensor; low temperature; resolution; resistance; Temperature dependence; Sensitivity analysis; Noise; Magnetoresistive devices; Measuring methods; Temperature range 65-273 K; Sensors; Magnetoresistance
• ISSN: 0011-2275; 1879-2235
• DOI: 10.1016/S0011-2275(97)00150-1

We have performed experimental investigations in order to determine the sensitivity and the resistance of the KMZ10A magnetoresistive (MR) sensor in the temperature range between 50 and 290
K by using a cryocooler. The sensitivity increases for a decrease of temperature whereas the resistance decreases. At 50
K the MR sensor shows 1.33 times the sensitivity that it does at 290
K. The resistance at 50
K is 0.52 times the resistance at 290
K. Noise measurements performed in a cryoperm shielding at room temperature and at 77
K in liquid nitrogen have shown that the voltage fluctuation in the white noise range of the MR sensor is equal to that of an equivalent resistor leading to a resolution of 44
pT/√Hz at room temperature and 13
pT/√Hz at 77
K.