US 11,774,520 B2
Ferrimagnetic oscillator magnetometer
John F. Barry, Arlington, MA (US); Reed Anderson Irion, Belmont, MA (US); Jessica Kedziora, Shirley, MA (US); Matthew Steinecker, Medford, MA (US); Daniel K. Freeman, Reading, MA (US); and Danielle A. Braje, Winchester, MA (US)
Assigned to Massachusetts Institute of Technology, Cambridge, MA (US)
Filed by Massachusetts Institute of Technology, Cambridge, MA (US)
Filed on May 12, 2021, as Appl. No. 17/317,983.
Claims priority of provisional application 63/050,832, filed on Jul. 12, 2020.
Prior Publication US 2022/0011383 A1, Jan. 13, 2022
Int. Cl. G01R 33/02 (2006.01); G06F 3/046 (2006.01); H03B 15/00 (2006.01)
CPC G01R 33/02 (2013.01) [G06F 3/046 (2013.01); H03B 15/006 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A magnetometer comprising:
a ferrimagnetic crystal comprising an ensemble of entangled electronic spins, the ensemble of entangled electronic spins having a resonance that shifts in response to an external magnetic field;
a sustaining amplifier, in electrical communication with the ferrimagnetic crystal, to amplify a microwave signal modulated by a shift in the resonance of the ensemble of entangled electronic spins; and
a digitizer, in electrical communication with the sustaining amplifier and/or the ferrimagnetic crystal, to digitize the microwave signal.