Epitaxial bilayer of tetragonal Heusler-like D022-MnGa and cubic Heusler L21-Co2MnSi have been successfully grown even for an unannealed sample. The interfacial exchange coupling (Jex) for samples annealed at different temperatures was evaluated from the magnetic hysteresis loop. Antiferromagnetic Jex was observed in the interfaces of cubic Heusler Co2MnSi and tetragonal D022-MnGa layers. The evaluated Jex is -3.2 erg/cm2 for a bilayer film annealed at 400°C, being comparable to that for the FeCo/MnGa interface.
- Co<inf>2</inf>MnSi film
- Interfacial exchange coupling
- MnGa film