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Ultimate sensitivity for quantum magnetometry using nitrogen-vacancy (NV)centers in diamond is limited by number of NV centers and coherence time.Microwave irradiation with a high and homogeneous power density for a largedetection volume is necessary to achieve highly sensitive magnetometer. Here,we demonstrate a microwave resonator to enhance the power density of themicrowave field and an optical system with a detection volume of 1.4e-3 mm$^3$.The strong microwave field enables us to achieve 48 ns Rabi oscillation whichis sufficiently faster than the phase relaxation time of NV centers. Thissystem combined with a decoupling pulse sequence, XY16, extends the spincoherence time (T2) up to 27 times longer than that with a spin echo method.Consequently, we obtained an AC magnetic field sensitivity of 10.8pT/Hz$^{1/2}$ using the dynamical decoupling pulse sequence.

Highly sensitive macro-scale diamond magnetometer operated by dynamical decoupling sequence with coplanar waveguide resonator