Report

Ferromagnetic Imprinting of Nuclear Spins in Semiconductors

Science  05 Oct 2001:
Vol. 294, Issue 5540, pp. 131-134
DOI: 10.1126/science.1063186

You are currently viewing the abstract.

View Full Text

Via your Institution

Log in through your institution

Log in through your institution


Abstract

We examine how a ferromagnetic layer affects the coherent electron spin dynamics in a neighboring gallium arsenide semiconductor. Ultrafast optical pump-probe measurements reveal that the spin dynamics are unexpectedly dominated by hyperpolarized nuclear spins that align along the ferromagnet's magnetization. We find evidence that photoexcited carriers acquire spin-polarization from the ferromagnet, and dynamically polarize these nuclear spins. The resulting hyperfine fields are as high as 9000 gauss in small external fields (less than 1000 gauss), enabling ferromagnetic control of local electron spin coherence.

  • * To whom correspondence should be addressed. E-mail: awsch{at}physics.ucsb.edu

View Full Text

Related Content