Atomic and electronic structure of CoÕSrTiO3 ÕCo magnetic tunnel junctions
نویسندگان
چکیده
First-principles density-functional calculations of the atomic and electronic structure of Co/SrTiO3 /Co ~001! magnetic tunnel junctions ~MTJ’s! are performed. Different interface terminations are considered and the most stable structure with the TiO2 termination is identified based on energetics of adhesion. The calculated electronic structure of the TiO2-terminated MTJ shows an exchange coupling between the interface Co and Ti atoms mediated by oxygen. This coupling induces a magnetic moment of 0.25mB on the interface Ti atom, which is aligned antiparallel to the magnetic moment of the Co layer. We argue that this might cause an inversion of the spin polarization of tunneling across the SrTiO3 barrier which was found in recent experiments.
منابع مشابه
Atomic, electronic, and magnetic properties of magnetic tunnel junctions
We report results of first-principles density-functional studies of the atomic and electronic structure of Co/Al2O3 /Co and Co/SrTiO3 /Co magnetic tunnel junctions ~MTJs!. The atomic structure has been studied for different interface terminations and the interfacial energetics was quantified based on the work of separation. Based on energetics of cohesion, the O-terminated and TiO2-terminated i...
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