Abstract
For a spin device application of a magnetic superlattice, we investigate the optimal condition to obtain a fully spin-polarized current with sizable ballistic conductance. We consider a quasi-one-dimensional magnetic superlattice, formed by a periodic magnetic field and a split gate technique on a two-dimensional electron gas system. We obtain such a condition by analyzing an energy miniband dispersion and a spin-dependent transmission probability for each channel. The transfer matrix theory and Bloch's theorem are used in the detailed calculation. From the results, we propose an optimized aspect ratio of size parameters of a quasi-one-dimensional magnetic superlattice as a spin filter to generate currents having simultaneous full spin polarization and sizable ballistic conductance.
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