公开(公告)号：US11774520B2

公开(公告)日：2023-10-03

申请号：US17317983

申请日：2021-05-12

Applicant: Massachusetts Institute of Technology

Inventor： John F. Barry ,  Reed Anderson Irion ,  Jessica Kedziora ,  Matthew Steinecker ,  Daniel K. Freeman ,  Danielle A. Braje

IPC: G01R33/02 ,  G06F3/046 ,  H03B15/00

CPC classification number: G01R33/02 ,  G06F3/046 ,  H03B15/006

Abstract: Ferrimagnetic oscillator magnetometers do not use lasers to stimulate fluorescence emission from defect centers in solid-state hosts (e.g., nitrogen vacancies in diamonds). Instead, in a ferrimagnetic oscillator magnetometer, the applied magnetic field shifts the resonance of entangled electronic spins in a ferrimagnetic crystal. These spins are entangled and can have an ensemble resonance linewidth of approximately 370 kHz to 10 MHz. The resonance shift produces microwave sidebands with amplitudes proportional to the magnetic field strength at frequencies proportional to the magnetic field oscillation frequency. These sidebands can be coherently averaged, digitized, and coherently processed, yielding magnetic field measurements with sensitivities possibly approaching the spin projection limit of 1 attotesla/√{square root over (Hz)}. The encoding of magnetic signals in frequency rather than amplitude relaxes or removes otherwise stringent requires on the digitizer.

公开(公告)号：US20220011383A1

公开(公告)日：2022-01-13

申请号：US17317983

申请日：2021-05-12

Applicant: Massachusetts Institute of Technology

Inventor： John F. Barry ,  Reed Anderson Irion ,  Jessica Kedziora ,  Matthew Steinecker ,  Daniel K. Freeman ,  Danielle A. Braje

IPC: G01R33/02 ,  H03B15/00 ,  G06F3/046

Abstract: Ferrimagnetic oscillator magnetometers do not use lasers to stimulate fluorescence emission from defect centers in solid-state hosts (e.g., nitrogen vacancies in diamonds). Instead, in a ferrimagnetic oscillator magnetometer, the applied magnetic field shifts the resonance of entangled electronic spins in a ferrimagnetic crystal. These spins are entangled and can have an ensemble resonance linewidth of approximately 370 kHz to 10 MHz. The resonance shift produces microwave sidebands with amplitudes proportional to the magnetic field strength at frequencies proportional to the magnetic field oscillation frequency. These sidebands can be coherently averaged, digitized, and coherently processed, yielding magnetic field measurements with sensitivities possibly approaching the spin projection limit of 1 attotesla/√{square root over (Hz)}. The encoding of magnetic signals in frequency rather than amplitude relaxes or removes otherwise stringent requires on the digitizer.