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We present a sensitive diamond quantum sensor with a magnetic fieldsensitivity of $9.4 \pm 0.1~\mathrm{pT/\sqrt{Hz}}$ in a near-dc frequency rangeof 5 to 100~Hz. This sensor is based on the continuous-wave optically detectedmagnetic resonance of an ensemble of nitrogen-vacancy centers along the [111]direction in a diamond (111) single crystal. The long $T_{2}^{\ast} \sim2~\mathrm{\mu s}$ in our diamond and the reduced intensity noise inlaser-induced fluorescence result in remarkable sensitivity among diamondquantum sensors. Based on an Allan deviation analysis, we demonstrate that asub-picotesla field of 0.3~pT is detectable by interrogating the magnetic fieldfor a few thousand seconds. The sensor head is compatible with variouspractical applications and allows a minimum measurement distance of about 1~mmfrom the sensing region. The proposed sensor facilitates the practicalapplication of diamond quantum sensors.

Diamond quantum magnetometer with dc sensitivity of < 10 pT Hz$^{-1/2}$ toward measurement of biomagnetic field