Abstract: A measurement system includes a container configured to contain a solvated target molecule and at least one magnetoresistive (MR) sensor device including at least one MR sensor disposed near the container and configured to measure a magnetic field generated by the solvated target molecule, each of the at least one MR sensor including a pin layer having a pinned direction of magnetization, a free layer having a direction of magnetization that varies with an applied magnetic field, and a non-conductive layer separating the pin layer and the free layer.

Abstract: Time-multiplexed atomic magnetometry uses first and second atomic vapor cells located adjacent to a sample to be measured. Each vapor cell operates according to a sequence of alternating pumping and probing stages. However, the sequences are temporally offset from each other such that the second vapor cell is pumped while the first vapor cell is probed, and the first vapor cell is pumped while the second vapor cell is probed. With this time-multiplexed operation, the magnetic field generated by the sample can be measured without any time gaps. The Hilbert transform of the signals may be taken to obtain their instantaneous phases, which may then be interleaved to form a single gapless time sequence that represents the magnetic field of the sample over a time window that lasts for several continuous pumping/probing stages.