Placing a sensor close to the target at the nano-level is a central challenge in quantum sensing. We demonstrate high-spatial-resolution magnetic field imaging with a boron vacancy (VB−) defects array in hexagonal boron nitride with a few 10 nm thickness. VB− sensor spots with a size of (100 nm)2 are arranged periodically with nanoscale precision using a helium ion microscope and attached tightly to a gold wire. The sensor array allows us to visualize the magnetic field induced by the current in the wire with a spatial resolution beyond the diffraction limit. Each sensor exhibits a practical sensitivity of 73.6μT/Hz0.5, suitable for quantum materials research. Our technique of arranging VB− quantum sensors periodically and tightly on measurement targets will maximize their potential.
@article{arxiv.2301.12645,
title = {Magnetic field imaging by hBN quantum sensor nanoarray},
author = {Kento Sasaki and Yuki Nakamura and Hao Gu and Moeta Tsukamoto and Shu Nakaharai and Takuya Iwasaki and Kenji Watanabe and Takashi Taniguchi and Shinichi Ogawa and Yukinori Morita and Kensuke Kobayashi},
journal= {arXiv preprint arXiv:2301.12645},
year = {2023}
}