Nuclear Magnetic Resonance in a Ferromagnet-Semiconductor Heterostructure
J. Strand, B. D. Schultz, A. F. Isakovic, X. Lou, C. J. Palmstrom, P., A. Crowell
TL;DR
This paper reports the first observation of nuclear magnetic resonance (NMR) in a ferromagnet-semiconductor heterostructure, demonstrating dynamic nuclear polarization induced by spin-polarized currents and its persistence.
Contribution
It introduces the observation of NMR in a ferromagnet-semiconductor heterostructure with dynamic polarization and long nuclear spin retention, a novel experimental finding.
Findings
Nuclear polarization time ~20 seconds
Nuclear polarization persists for minutes
Resonant depolarization observed with AC magnetic field or current modulation
Abstract
We report the observation of nuclear magnetic resonance (NMR) in a ferromagnet-semiconductor heterostructure in the presence of a spin-polarized current. Spin-polarized electrons injected from a metallic ferromagnet generate a large nuclear spin population in a GaAs quantum well by dynamic polarization. The characteristic time for the polarization process is approximately 20 sec, and the nuclear polarization can persist for several minutes after the current is turned off. Resonant depolarization is observed in the presence of an AC magnetic field or when the injection current is modulated at the NMR frequency.
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