Ferromagnetism and canted spin phase in AlAs/Ga1-xMnxAs single quantum wells:: Monte Carlo simulation

The magnetic order resulting from a confinement-adapted Ruderman-Kittel-Kasuya-Yosida indirect exchange between magnetic moments in the metallic phase of a AlAs/Ga1-xMnxAs quantum well is studied by Monte Carlo simulation. This coupling mechanism involves magnetic moments and carriers (holes), both coming from the same Mn2+ ions. It leads to a paramagnetic, a ferromagnetic, or a canted spin phase; depending on the carrier concentration, and on the magnetic layer width. It is shown that high transition temperatures may be obtained.