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We describe a Cs atomic magnetometer operating in the spin-exchangerelaxation-free (SERF) regime. With a vapor cell temperature of$103^\circ\rm{C}$ we achieve intrinsic magnetic resonance widths $\Delta B=17{\rm \mu G}$ corresponding to an electron spin-relaxation rate of $300 {\rms^{-1}}$ when the spin-exchange rate is $\Gamma_{SE}=14000 {\rm s^{-1}}$. Wealso observe an interesting narrowing effect due to diffusion. Signal-to-noisemeasurements yield a sensitivity of about $400\thinspace{\rm pG/\sqrt{Hz}}$.Based on photon shot noise, we project a sensitivity of $40 {\rmpG/\sqrt{Hz}}$. A theoretical optimization of the magnetometer indicatessensitivities on the order of $2 {\rm pG/\sqrt{Hz}}$ should be achievable in a$1 {\rm cm^3}$ volume. Because Cs has a higher saturated vapor pressure thanother alkali metals, SERF magnetometers using Cs atoms are particularlyattractive in applications requiring lower temperatures.

Spin-exchange relaxation free magnetometry with Cs vapor