Local control of spin polarization in a semiconductor by microscale current loops

Chen, Y. S.; Halm, S.; Neshataeva, E.; Kümmell, T.; Bacher, G.; Wiater, M.; Wojtowicz, T.; Karczewski, G.
October 2008
Applied Physics Letters;10/6/2008, Vol. 93 Issue 14, p141902
Academic Journal
We demonstrate a method to electrically manipulate the spin polarization in a semiconductor on a micrometer length scale and a submicrosecond time scale. A variable magnetic field induced by a microscale current loop magnetizes the Mn2+ ions in a CdMnTe/CdMgTe diluted magnetic semiconductor quantum well, and via sp-d exchange interaction polarizes photogenerated electron-hole pairs. A maximum spin polarization degree of ±8.5% is obtained at 4.2 K without external magnetic field. The induced carrier spin polarization and the thermal heating of Mn2+ spins are resolved spatially and temporally by microphotoluminescence measurements.


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