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Material structures containing tetrahedral FeAs bonds, depending on theirdensity and geometrical distribution, can host several competing quantum groundstates ranging from superconductivity to ferromagnetism. Here we examinestructures of quasi two-dimensional (2D) layers of tetrahedral Fe-As bondsembedded with a regular interval in a semiconductor InAs matrix, whichresembles the crystal structure of Fe-based superconductors. Contrary to thecase of Fe-based pnictides, these FeAs/InAs superlattices (SLs) exhibitferromagnetism, whose Curie temperature (Tc) increases rapidly with decreasingthe InAs interval thickness t_InAs (Tc ~ t_InAs^-3), and an extremely largemagnetoresistance up to 500% that is tunable by a gate voltage. Our firstprinciples calculations reveal the important role of disordered positions of Featoms in the establishment of ferromagnetism in these quasi-2D FeAs-based SLs.These unique features mark the FeAs/InAs SLs as promising structures forspintronic applications.

Ferromagnetism and giant magnetoresistance in zinc-blende FeAs monolayers embedded in semiconductor structures