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• W54569312 abstract "The creation of spin polarization in non-magnetic media via electrical spin injection from a ferromagnetic tunnel contact was recently achieved for metals, semiconductors, organic and carbon-based materials including graphene. Yet, much of the basic behavior is heavily debated, including the unexpectedly short spin lifetimes observed, and the magnitude and sign of the induced polarization. Here we demonstrate, using semiconductor/Al2O3/ferromagnet tunnel structures based on silicon or GaAs, that local magnetostatic fields dramatically alter and even dominate spin polarization and spin dynamics near the tunnel interface. Spin precession in inhomogeneous magnetic fields arising from interface roughness is shown to reduce the spin accumulation up to tenfold, and causes it to be inhomogeneous and non-collinear with the injector magnetization. The inverted Hanle effect serves as experimental signature. Additionally, the measured spin lifetime exhibits an apparent reduction, and for silicon at room temperature it is shown that it is significantly larger than previously extracted. Not limited to semiconductors, this phenomenon modifies, but potentially also allows control of spins near magnetic interfaces in various spintronic structures." @default.
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• W54569312 date "2011-01-10" @default.
• W54569312 modified "2023-09-27" @default.
• W54569312 title "Spin precession and decoherence near an interface with a ferromagnet" @default.
• W54569312 hasPublicationYear "2011" @default.
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