Measurement of Micro Magnetic Moment by Means of Resonating Sample Magnetometry.

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Abstract
A new type of highly sensitive magnetometer called a resonating sample magnetometer (RSM) is described. A magnetic sample is mounted on the end of a cantilever rod that incorporates a flat spring with a pick-up coil. The sample is magnetized in a de field, -5 kOe<Ha< +5 kOe,and is simultaneously subjected to a small ac field gradient.The ac field gradient exerts an alternating magnetic force on the sample, proportional to the sample's magnetic moment. The resulting oscillation of the rod is greatly amplified by using the mechanical resonance of the flat Elinvar spring, whose elastic modulus is almost constant in response to temperature variation. The deflection is measured by the pick-up coil. The RSM is considered as a possible system for measuring the temperature variation of magnetization. At room temperature, the sensitivity of the RSM is 6 × 10-7 emu, and a complete hysteresis loop can be measured in about 15 min.

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