An optically modulated zero-field atomic magnetometer with suppressed   spin-exchange broadening
  We demonstrate an optically pumped $^{87}$Rb magnetometer in a microfabricated vapor cell based on a zero-field dispersive resonance generated by optical modulation of the $^{87}$Rb ground state energy levels. The magnetometer is operated in the spin-exchange relaxation-free regime where high magnetic field sensitivities can be achieved. This device can be useful in applications requiring array-based magnetometers where radio frequency magnetic fields can induce cross-talk among adjacent sensors or affect the source of the magnetic field being measured. 
Ricardo Jimenez-Martinez, Svenja Knappe, and John Kitching
physics.ins-det physics.atom-ph