Nuclear magnetic resonance in a ferromagnet–semiconductor heterostructure

J. Strand, A. F. Isakovic, X. Lou, P. A. Crowell, B. D. Schultz, C. J. Palmstrøm
2003 Applied Physics Letters  
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
more » ... onant depolarization is observed in the presence of an AC magnetic field or when the injection current is modulated at the NMR frequency.
doi:10.1063/1.1620685 fatcat:4rfgre3wbfbsdcxwmtfhmmjb54