This dataset contains four Excel spreadsheets which represent data associated with the figures for the related manuscript, "Free-induction-decay magnetic field imaging with a microfabricated Cs vapor cell". Figure descriptions are provided below.

Figure 2(a)

Raw FID signal train time domain trace over a 10 ms period collected from the polarimeter (signal detector), showing the precession of the atoms by monitoring the light polarization rotation. The precession rate was 172.9 kHz measured by fitting to a damped sinusoidal model. The pump-probe repetition cycle rate was 1 kHz.   

Figure 2(b)

Amplitude spectral density (ASD) in pT/sqrt(Hz) computed via Welch’s method by averaging the magnetic field time traces gathered by analysing 40 subsequent FID signal trains. The peak observed at 376 Hz originates from an oscillating current flowing through a wire used as a magnetic imaging source. The sensitivity of 0.43 pT/sqrt(Hz) was measured from the mean of the noise floor over the frequency range 100 Hz to 500 Hz.

Figure 3(a)

Average magnetic field values measured from a series of 1 s magnetic field time traces acquired by the FID magnetometer at different probe beam positions along the x-axis of the vapor cell. Different magnetic field gradients were applied along the x-axis by supplying a range of currents, from -2.5 mA to 2.5 mA, through a counter-wound coil. This includes a measurement of the sensor background when no field was produced by the gradient coil.

Figure 3(b)

Magnetic field gradients measured after subtracting the sensor background. 

Figure 4(a)

1D magnetic field spatial distribution measured from the current configuration depicted in Fig. 1(c), consisting of a copper wire in an "s" configuration. The magnetic field values are measured across a range of probe beam positions along the x-axis of the cell for different currents (from -4 mA to 4 mA) flowing through the copper wire. The experimental readings were measured from a series of 1 s magnetic field time series acquired with the FID magnetometer. The theoretical predictions are based on the Biot-Savart law, shown in Eqs. 2 and 3. The wire is assumed to be 4.5 mm from the cell in alignment with experimental conditions. 

Figure 4(b)

Experimental data measured from Fig. 4(a) after the sensor background (i.e., 0mA readings) and subsequent mean values have been subtracted. 

Figure 5(a)

OPM output measured at each probe beam location by acquiring a series of 1 s magnetic field time traces from the FID magnetometer for positive current case. The probe beam is translated across two-dimensions along the x and y axes. 

Figure 5(b)

Theoretical magnetic field values calculated over the same range of probe beam positions as Fig. 5(a), based on the Biot-Savart law (see Eq. 2). The theory predicts the fields generated at each probe beam position from the “cross” current configuration depicted in Fig. 1(d) assuming a 3.08 mA current through the copper wire. The wire is assumed to be 4.5 mm from the cell in alignment with experimental conditions.

Figure 5(c) 

2D magnetic field spatial distribution measurements when currents of 3.08 mA and −3.13 mA are passed through the copper wire. The sensor background was subtracted from the OPM recordings (averaged over 1 s) at each probe beam location. 

Figure 6(a) 

Simulated FID OPM response (purple dots) to a field modulation (black line) of amplitude, Bm.

Figure 6(b) 

First 10 ms of OPM recordings at different probe beam positions as indicated in Fig. (c). The associated y-axis position is noted.   

Figure 6(c) 

2D magnetic field spatial distribution produced when a 0.55 mA root-mean-square current modulation at 376 Hz is passed through the wire. The in-phase component, BX, is calculated using software demodulation of the 1 s magnetic field time series measured at each probe beam position.

Figure 6(d)

Difference between the DC and oscillating magnetic field components after scaling according to the respective current amplitudes and expected frequency response at 376 Hz.