The Limiting Sensitivity of an Alternating-Current Method of Measuring Small Magnetic Moments

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Abstract
A method of measuring the moment of small magnetic dipoles is described. The dipole to be measured is rotated inside of a fixed coil, and the voltage induced in the coil is measured by means of an alternating‐current amplifier. The limiting sensitivity is computed from the calculated signal‐voltage and the thermal agitation in the input circuit. In the practical application the theoretical sensitivity is approximately obtained and moments of 3×10−7 c.g.s. unit can be detected and with a specimen 1.5 cm on a side 8×10−8 c.g.s. unit/cc can be detected. The method has been applied to the measurement of the polarization in sedimentary deposits.

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