Abstract
The magneto-resistance of a thin film platinum resistance thermometer, PTF-7, was measured between 20 and 200K under magnetic fields of up to 8T. It showed a high stability during the thermal cycles between room temperature and liquid nitrogen temperature. The variation among the resistance values at 20, 50, 100 cycles was <1mK in terms of temperature for 8 of 10 sensors. Its magneto-resistance, ε, was well fit by an empirical formula ε=D(T)B2/(1+E(T)B) with two fitting parameters, D(T) and E(T). The variation of the magneto-resistance among the sensors was found to be 5%, which is 30 times as large as that of new-JIS fine wire platinum resistance thermometers, GR 0705. The anisotropy of the magneto-resistance was also measured and found to be as large as 50% depending on the direction of the field applied to the sensors.
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