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Drawing of the magnetometer system. A: alkali-metal cell, B: boron-nitride oven, C: photo of the radiation shield, D: optical access for probe laser, E: G-7 fiberglass frame for magnetic field and gradient coils and water cooling, F: photo of the sample heater, and G: ferrite magnetic shield.
Optical rotation in response to a 10 pT oscillating magnetic field as a function of the pump and probe laser power. Left panel: measurement points with color interpolation, right panel: theoretical calculation.
Magnetic field response curves (top) and noise spectrum (bottom) for different values of the magnetic field. The left axis shows magnetization sensitivity of the gradiometer.
Rock magnetization as a function of temperature. Inset shows that even at highest temperature the signal-to-noise is greater than 30. These measurements are obtained without gradiometric recording.
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