Affiliation:
1. North University of China
2. Osaka University
Abstract
In this paper, we implement integrated magnetic flux concentrators
(MFCs) combined with a multi-frequency modulation method to achieve
high-magnetic-detection sensitivity using a nuclear spin on the solid
nuclear spin in diamonds. First, we excited the nuclear spin in
diamonds using a continuous-wave technique, and a linewidth of
1.37 MHz and frequency resolution of 79 Hz were
successfully obtained, which is reduced by one order of the linewidth,
and increased by 56 times in frequency resolution compared to that
excited by an electron spin. The integrated high-permeability MFC was
designed to magnify the magnetic field near the diamond, with a
magnification of 9.63 times. Then, the multi-frequency modulation
technique was used to fully excite the hyperfine energy level of
Nitrogen Vacancy (NV) centers along the four axes on the diamond with
MFC, and magnetic detection sensitivity of 250pT/Hz1/2 was realized. These techniques should
allow designing an integrated NV magnetometer with high sensitivity in
a small volume.
Funder
The International Cooperation and
Exchange Project of National Natural Science Foundation of
China
National Natural Science Foundation of
China
Shanxi Outstanding Youth
Fund
The Fund for Shanxi “1331” Project Key
Subjects Construction
Shanxi Province Key Laboratory of Quantum
Sensing and Precision Measurement
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering