Electric field induced transitional magnetic coupling in (Ga, Cr)N/GaN magnetic tunnel junctions

Diluted magnetic semiconductor (DMS) composed in magnetic tunnel junctions (MTJs) are predicted to have potential applications in spintronics. However, the crucial issue is how to control the magnetic order of DMSs. In our semiconductor MTJs (SMTJs) model, formed of (Ga,Cr)N/GaN/(Ga,Cr)N multilayers, we found that the electrons can transfer from one (Ga,Cr)N electrode to another upon the external electric field, hence the magnetic interaction between two doped Cr ions in each (Ga,Cr)N DMS electrode can be changed from ferromagnetic to antiferromagnetic. The phenomenon proposes a possible way for the application of SMTJs.