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Nuclear quadrupole resonance spectroscopy with a femtotesla diamond magnetometer

Journal Article · · Science Advances
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [1];  [1];  [1];  [1]
  1. Univ. of New Mexico, Albuquerque, NM (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States); Univ. of Latvia, Riga (Latvia)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  4. NuevoMR, Albuquerque, NM (United States)
  5. ODMR Technologies Inc., El Cerrito, CA (United States); University of California, Berkeley, CA (United States)
  6. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Radio frequency (RF) magnetometers based on nitrogen vacancy centers in diamond are predicted to offer femtotesla sensitivity, but previous experiments were limited to the picotesla level. We demonstrate a femtotesla RF magnetometer using a diamond membrane inserted between ferrite flux concentrators. The device provides ~300-fold amplitude enhancement for RF magnetic fields from 70 kHz to 3.6 MHz, and the sensitivity reaches ~70 fT√s at 0.35 MHz. The sensor detected the 3.6-MHz nuclear quadrupole resonance (NQR) of room-temperature sodium nitrite powder. The sensor’s recovery time after an RF pulse is ~35 μs, limited by the excitation coil’s ring-down time. The sodium-nitrite NQR frequency shifts with temperature as -1.00±0.02 kHz/K, the magnetization dephasing time is T2*=887±51 μs, and multipulse sequences extend the signal lifetime to 332±23 ms, all consistent with coil-based studies. Our results expand the sensitivity frontier of diamond magnetometers to the femtotesla range, with potential applications in security, medical imaging, and materials science.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2441378
Report Number(s):
LA-UR--23-21085
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 24 Vol. 9; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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