170nm nuclear magnetic resonance imaging using magnetic resonance force microscopy

摘要

We demonstrate one-dimensional nuclear magnetic resonance imaging of the semiconductor GaAs with 170nm slice separation and resolve two regions of reduced nuclear spin polarization density separated by only 500 nm. This was achieved by force detection of the magnetic resonance, magnetic resonance force microscopy (MRFM), in combination with optical pumping to increase the nuclear spin polarization. Optical pumping of the GaAs created spin polarization up to 12 times larger than the thermal nuclear spin polarization at 5K and 4T. The experiment was sensitive to smaple volumes of 50μm~3 containing ～4 * 10~(11) ~(71)Ga/(Hz)~(1/2). These results demonstrate the ability of force-detected magnetic resonance to apply magnetic resonance imaging to semiconductor devices and other nanostructures.