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Extraction of electrons from a semiconductor to a ferromagnet as well as thecase of injection in the reverse direction may be formulated as a scatteringtheory. However, the presence of bound states at the interface arising out ofdoping on the semiconductor side must be taken into account in the scatteringtheory. Inclusion of the interface states yields an explanation of a recentresult of spin imaging measurement which contradicts the current understandingof spin extraction. The importance of an extraction theory to spintronics isillustrated by an application to a spin switch.Comment: 4 two column pages, 3 figures, major revisions to improve the  presentation. in addition, the new version includes an electrically  controlled spin switc

Spin Extraction Theory and Its Relevance to Spintronics