Magnetic field gradient sensor with reduced sensitivity to vibrations

A magnetic field gradient sensor comprising a support and a structure comprising at least one first and one second movable elements, at least one mechanical coupler for mechanically coupling the first movable element and the second movable element, such that the structure can be displaced according to at least one balanced mechanical mode in the presence of a magnetic field gradient, said sensor also including at least one magnetic mechanical transducer including at least one magnetic sensor mechanically secured to one of the first and second movable elements, so as to be able to apply a mechanical load to the structure in the presence of a magnetic field gradient, and at least one electromechanical transducer including at least one structure displacement sensor for measuring the structural displacement at least for the balanced mode, wherein the at least one magnetic mechanical transducer is configured to have a higher magnetic-mechanical transduction gain for movements in the balanced mode than for movements in the unbalanced mode, and/or the at least one electromechanical transducer is configured to have a higher electromechanical gain for movements in the balanced mode than for movements in the unbalanced mode.