Hyperfine interactions and spin transport in ferromagnet-semiconductor heterostructures

M. K. Chan, Q. O. Hu, J. Zhang, T. Kondo, C. J. Palmstrøm, P. A. Crowell

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Measurements and modeling of electron-spin transport and dynamics are used to characterize hyperfine interactions in Fe/GaAs devices with n-GaAs channels. Ga and As nuclei are polarized by electrically injected electron spins, and the nuclear polarization is detected indirectly through the depolarization of electron spins in the hyperfine field. The dependence of the electron-spin signal on injector bias and applied field direction is modeled by a coupled drift-diffusion equation, including effective fields from both the electronic and nuclear polarizations. This approach is used to determine the electron-spin polarization independently of the assumptions made in standard transport measurements. The extreme sensitivity of the electron-spin dynamics to the nuclear-spin polarization also facilitates the electrical detection of nuclear magnetic resonance.

Original languageEnglish (US)
Article number161206
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number16
DOIs
StatePublished - Oct 28 2009

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