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Spin-polarization effect and wave-vector filtering effect in composite magnetic-barrier structures

We propose a composite magnetic-barrier structure, which is alternately arranged with two different kinds of magnetic barriers. We theoretically investigate the transport properties for electrons tunnelling through this type of magnetic-barrier structure with and without the interaction of the electronic spin and the magnetic field. It is shown that the composite magnetic barriers greatly enhance the wave-vector filtering properties in contrast to the corresponding non-composite magnetic barriers consisting of two identical magnetic barriers. It is also shown that the composite magnetic barriers exhibit a rather evident electron spin-polarization effect, especially in low-energy region, while the corresponding non-composite magnetic barriers do not possess the electron spin-polarization effect.