M. Loretz, J.M. Boss, et al.
Physical Review X
Micromechanical sensing of magnetic force was used to detect nuclear magnetic resonance with exceptional sensitivity and spatial resolution. With a 900 angstrom thick silicon nitride cantilever capable of detecting subfemtonewton forces, a single shot sensitivity of 1.6 × 1013 protons was achieved for an ammonium nitrate sample mounted on the cantilever. A nearby millimeter-size iron particle produced a 600 tesla per meter magnetic field gradient, resulting in a spatial resolution of 2.6 micrometers in one dimension. These results suggest that magnetic force sensing is a viable approach for enhancing the sensitivity and spatial resolution of nuclear magnetic resonance microimaging.
M. Loretz, J.M. Boss, et al.
Physical Review X
B.C. Stipe, H.J. Mamin, et al.
Physical Review Letters
G.C. Hill, J.I. Padovani, et al.
JMM
P. Grütter, D. Rugar, et al.
Journal of Applied Physics