Myong-Chol Pak, Hak-Chol Pak, Nam-Hyok Kim Myong-Chol Pak, Hak-Chol Pak, Nam-Hyok Kim
We discuss spin injection efficiency as a function of Fermi energy in DMS/FM heterostructures by spin injection efficiency equation and Landauer formula. The higher electric field, the stronger spin injection efficiency, and its velocity of increase gets lower and approaches to the equilibrium state. Additionally, the higher is interface conductivity, the weaker is spin injection efficiency, and the transmission as a function of Fermi energy for spin up and spin down is different from each other. This result causes the effect of the exchange interaction term in DMS. Finally, according to the investigation of spin injection efficiency as a function of the magnetic field in the same structure, the spin injection efficiency vibrates sensitively with the magnetic field. This result allows us to expect the possibility of spintronic devices with high sensitivity to magnetic field.
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http://arxiv.org/abs/1209.2481
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