The nuclear magnetic resonance (NMR) was detected in GaAs by selecting inverting 71Ga spins to create a local force gradients which shifts the mechanical resonance frequency of a nearby magnetic tipped microcantilever. A magnetic moment sensitivity of 7.5×10 -21 J/T which was equal to the Curie law magnetization from 7.1×10 8 71Ga spins, was demonstrated by employing a low spring constant cantilever at 4.4 K and 7 T. It was observed that the magnetic moment sensitivity increases by decreasing the magnet diameter and tip sample separation. The results show that their is a need to spin lock sample magnetization during detection.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)