Spin Polarization Contrast Observed in GaAs by Force-Detected Nuclear Magnetic Resonance
ARMY RESEARCH LAB ADELPHI MD
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We applied the recently developed technique of force-detected nuclear magnetic resonance NMR to observe 71Ga, 69Ga, and 75As in GaAs. The nuclear spin-lattice relaxation time is 21 5 min for 69Ga at 5 K and 4.6 Tesla. We have exploited this long relaxation time to first create and then observe spatially varying nuclear spin polarization within the sample, demonstrating a new form of contrast for magnetic resonance force microscopy MRFM. Such nuclear spin contrast could be used to indirectly image electron spin polarization in GaAs-based spintronic devices.
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy