We demonstrate a sensitive spatially resolved magnetometer using a spinor Bose-Einstein condensate (BEC) of ${}^{87}\mathrm{Rb}$ atoms with increased probe fluence. By performing a probe parameter search using a two-polarization phase contrast imaging technique, we find that the probe-induced atom loss, a major constraint in optical magnetometry with high-density gas, can be reduced. We attain a sensitivity of 5.4(6) mrad for the phase measurement of Larmor precession using a measurement area of $1.4\times {10}^2\mu {\mathrm{m}}^2$ with a probe fluence of $4.1\times {10}^5\mu {\mathrm{m}}^{-2}$. A dc magnetic field sensitivity of $5.0\left(4\right)\mathrm{pT}/\sqrt{\mathrm{Hz}}$ is attained with a probe fluence of $3.9\times {10}^5\mu {\mathrm{m}}^{-2}$. The results should contribute to further enhancement of the sensitivity of a BEC magnetometer.

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• Laser spectroscopy
• Optical pumping
• Photoassociation
• Spinor Bose-Einstein condensates
• Stark effect
• Zeeman effect