An atomically flat and uniform reaction layer of Mn(Ga)As was found to self-organize at the (Ga,Mn) AsIrMn interface by postannealing. The Mn(Ga)As layer exhibits strong ferromagnetic characteristics up to the measured 300 K. In particular, the manifested horizontal shift of field-cooled hysteresis loops shows a clear signature of exchange bias attributable to the exchange coupling between IrMn and Mn(Ga)As. Implication from composition analyses, exchange-bias effect, and thickness dependence of the Mn(Ga)As layer versus annealing conditions is also discussed.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)