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We explore properties of the radio-frequency atomic magnetometer,specifically its sensitivity to the polarisation of an oscillating magneticfield. This aspect can be particularly relevant to configurations where thesensor monitors fields created by more than one source. The discussion,illustrated by theoretical and experimental studies, is done in the context ofthe signals produced by electrically conductive and magnetically permeableplates in magnetic induction tomography measurements. We show that differentcomponents of the secondary magnetic fields create the object responsedepending on the properties of the material, with the polarisation of the rffield varying across the object's surface. We argue that the ability of thesensor to simultaneously detect different field components enables theoptimisation of measurement strategies for different object compositions.

Polarisation of radio-frequency magnetic fields in magnetic induction measurements with an atomic magnetometer