Ferrimagnetic Oscillator Magnetometer
John F. Barry, Reed A. Irion, Matthew Steinecker, D. Freeman, Jessica Kedziora, Reginald G. Wilcox, Danielle Braje
Abstract
Quantum sensors based on solid-state spins have advanced rapidly over the prior decade, but deploying these sensors in real-world applications remains technically challenging. By introducing an innovative oscillator-based sensor architecture, and employing a ferrimagnetic material rather than the paramagnetic spin defects more commonly studied, this work details the construction of a compact magnetometer with a minimum sensitivity of 100 fT/\ensuremath{\surd}Hz. The sensor's architecture offers advantages in dynamic range, simplicity, and compactness---qualities that may enable widespread use of solid-state quantum sensors outside a laboratory environment.