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Diamond quantum magnetometer with dc sensitivity of sub-10 pT <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Hz</mml:mi><mml:msup><mml:mspace width="0.2em"/><mml:mrow><mml:mo>โ</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:math> toward measurement of biomagnetic field
We present a sensitive diamond quantum sensor with a magnetic field sensitivity of $9.4\ifmmode\pm\else\textpm\fi{}0.1\phantom{\rule{0.2em}{0ex}}\mathrm{pT}/\sqrt{\mathrm{Hz}}$ in a near-dc frequency range of 5 to 100 Hz. This sensor is based on the continuous-wave optically detected magnetic resonance of an ensemble of nitrogen-vacancy centers along the [111] direction in a diamond (111) single โฆ