An astatic magnetometer with electronic feedback for the measurement of remanence of heated rock samples

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Abstract
An astatic magnetometer with feedback is described. A unique feature of the magnetometer is that its sensitivity and response time may be altered by a single switch, so that moments in the range of 5 G cm3-50 mu G cm3 can be measured, keeping the sample at a fixed distance from the magnetometer. It has proved particularly useful for experiments in thermal demagnetization of rock samples up to 1000 K. The specimens to be measured are located some 8 cm below the lower magnet of the astatic pair and a total moment of 50 mu G cm3 (50 nA m-1) can be measured at 1000 K. Without the furnace with the sample 4 cm below the lower magnet a total moment of 1 mu G cm3 (1 nA m-1) may be measured. The output is displayed on a digital voltmeter, but any other data logging device for on line processing may be incorporated.

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