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Single-crystal Heusler atomic-scale superlattices that have been predicted toexhibit perpendicular magnetic anisotropy and half-metallicity have beensuccessfully grown by molecular beam epitaxy. Superlattices consisting offull-Heusler Co$_2$MnAl and Fe$_2$MnAl with one to three unit cell periodicitywere grown on GaAs (001), MgO (001), and Cr (001)/MgO (001). Electron energyloss spectroscopy maps confirmed clearly segregated epitaxial Heusler layerswith high cobalt or high iron concentrations for samples grown near roomtemperature on GaAs (001). Superlattice structures grown with an excess ofaluminum had significantly lower thin film shape anisotropy and resulted in anout-of-plane spin reorientation transition at temperatures below 200 K forsamples grown on GaAs (001). Synchrotron-based spin resolved photoemissionspectroscopy found that the superlattice structure improves the Fermi levelspin polarization near the X point in the bulk Brillouin zone. StoichiometricCo$_2$MnAl terminated superlattice grown on MgO (001) had a spin polarizationof 95%, while a pure Co$_2$MnAl film had a spin polarization of only 65%.

Epitaxial Heusler Superlattice Co2MnAl/Fe2MnAl with Perpendicular Magnetic Anisotropy and Termination-Dependent Half-Metallicity