The detection and characterization of paramagnetic species by electron spin resonance
(ESR) spectroscopy is widely used throughout chemistry, biology and materials science,
from in vivo imaging to distance measurements in spin-labelled proteins. ESR relies on the
inductive detection of microwave signals emitted by the spins into a coupled microwave
resonator during their Larmor precession. However, such signals can be very small,
prohibiting the application of ESR at the nanoscale (for example, at the single-cell level or …

The detection and characterization of paramagnetic species by electron spin resonance
(ESR) spectroscopy is widely used throughout chemistry, biology and materials science1,
from in vivo imaging2 to distance measurements in spin-labelled proteins3. ESR relies on
the inductive detection of microwave signals emitted by the spins into a coupled microwave
resonator during their Larmor precession. However, such signals can be very small,
prohibiting the application of ESR at the nanoscale (for example, at the single-cell level or …