Electrical Spin Injection: Spin-Polarized Transport from Magnetic into Non-Magnetic Semiconductors
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Spin polarized transport in semiconductors presently attracts a great deal of interest. For the past five years or so, several research groups have tried to achieve efficient injection of spin polarized electrons into non-magnetic semiconductors using ferromagnetic metals as spin injecting contacts. All these experiments have failed to produce conclusive results; the reasons for this lack of success were outlined in Chap. 2 and in . The main outcome of the theory for spin injection given in Chap. 2 is that the spin polarization a in the semiconductor is simply not proportional to the bulk spin polarization β in the ferromagnet. This is mainly due to the different conductivities of semiconductor (σ sc ) and ferromagnet (σ fm ) and to the short spin scattering length λ fm in the ferromagnet.
KeywordsSpin Polarization Circular Polarization Heavy Hole Zeeman Splitting Magnetic Circular Dichroism
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