Force-gradient detected nuclear magnetic resonance
- 21 June 2004
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 84 (25), 5091-5093
- https://doi.org/10.1063/1.1762700
Abstract
We have detected nuclear magnetic resonance in GaAs by selectively inverting 71 Ga spins to create a local force gradient which shifts the mechanical resonance frequency of a nearby magnet tipped microcantilever. Employing a low spring constant cantilever (60 μN/m) at 4.4 K and 7 T, we demonstrate a magnetic moment sensitivity of 7.5×10 −21 J/T , equal to the Curie Law magnetization from 7.1×10 8 71 Ga spins. The method obviates the need to spin-lock sample magnetization during detection, allowing the signal to be collected for a time approaching the full spin-lattice relaxation time.Keywords
This publication has 17 references indexed in Scilit:
- Batch fabrication and characterization of ultrasensitive cantilevers with submicron magnetic tipsJournal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2004
- Detection and Manipulation of Statistical Polarization in Small Spin EnsemblesPhysical Review Letters, 2003
- A vertical inertial coarse approach for variable temperature scanned probe microscopyReview of Scientific Instruments, 2003
- Spin polarization contrast observed in GaAs by force-detected nuclear magnetic resonanceApplied Physics Letters, 2002
- Sub-attonewton force detection at millikelvin temperaturesApplied Physics Letters, 2001
- Magnetic Resonance Force Microscopy Quantum Computer with Tellurium Donors in SiliconPhysical Review Letters, 2001
- Silicon dopant imaging by dissipation force microscopyApplied Physics Letters, 1999
- An optimal magnetic tip configuration for magnetic-resonance force microscopy of microscale buried featuresApplied Physics Letters, 1998
- Attonewton force detection using ultrathin silicon cantileversApplied Physics Letters, 1997
- Noninductive detection of single-proton magnetic resonanceApplied Physics Letters, 1991