We demonstrate vector magnetometry using ensemble of the nitrogen-vacancy (NV) centers in diamond that are perfectly aligned along the  direction. By changing the direction and strength of the reference magnetic field, we perform three-dimensional vector measurement of the Oersted field generated by the current flowing in a nearby wire. We had a formula for evaluating the magnetic field sensitivity in the direction perpendicular to the NV axis. We demonstrate that the expected sensitivity is 1.2 times higher than that of the NV ensemble isotropically oriented on four equivalent crystal axes. Our precise method is suitable for time-varying magnetic signals.
Vector magnetometry using perfectly aligned nitrogen-vacancy center ensemble in diamond
Moeta Tsukamoto, Kensuke Ogawa, Hayato Ozawa, Takayuki Iwasaki, Mutsuko Hatano, Kento Sasaki, Kensuke Kobayashi; Vector magnetometry using perfectly aligned nitrogen-vacancy center ensemble in diamond. Appl. Phys. Lett. 28 June 2021; 118 (26): 264002. https://doi.org/10.1063/5.0054809
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