Use of high performance electron spin resonance materials for the design of scalar and vectorial magnetometers

Extensive work on radical ESR (electron spin resonance) materials has led to the discovery of a number of products exhibiting intense and narrow ESR lines, suitable for magnetometry. These materials can be classified using a convenient figure of merit. Two of them were used in two specific architectures for a scalar magnetometer-(FA₎2P((fluoranthenyl)₂PF₆ )-₆ with a resolution of 1 nT-Hz^-1/2 (white noise) and a vectorial magnetometer (AcTCNQ₂) with a resolution of 0.2 nT-Hz^-1/2 (white noise). These magnetometers can be used in high gradients (usual indoor environments) and have bandwidths which can be extended from DC to several kHz