We propose a simple model quantum network consisting of diamond-shapedplaquettes with deterministic distribution of magnetic and non-magnetic atomsin presence of a uniform external magnetic flux in each plaquette and predictthat such a simple model can be a prospective candidate for spin filter as wellas flux driven spintronic switch. The orientations and the amplitudes of thesubstrate magnetic moments play a crucial role in the energy band engineeringof the two spin channels which essentially gives us a control over the spintransmission leading to a spin filtering effect. The externally tunablemagnetic flux plays an important role in inducing a switch on-switch off effectfor both the spin states indicating the behavior like a spintronic switch. Evena correlated disorder configuration in the on-site potentials and in themagnetic moments may lead to disorder-induced spin filtering phenomenon whereone of the spin channel gets entirely blocked leaving the other onetransmitting over the entire allowed energy regime. All these features areestablished by evaluating the density of states and the two terminaltransmission probabilities using the transfer-matrix formalism within atight-binding framework. Experimental realization of our theoretical study maybe helpful in designing new spintronic devices.
展开▼
