First-principles modelling of magnetic tunnel junctions
نویسنده
چکیده
Magnetic tunnel junctions (MTJ) are promising candidates for applications in spintronic devices such as magnetic random access memories, read heads and sensors [1]. The MTJs consist of two ferromagnetic layers separated by an insulating barrier layer. The physical quantity measured for signal detection is the tunnelling magnetoresistance (TMR), i.e. the relative difference in the resistance between parallel and antiparallel magnetizations of the electrodes. It was found that the TMR could be as high as 30% at room temperature in tunnel junctions based on ferromagnetic 3d-metal electrodes when alumina is used as the barrier layer (for a recent review, see [2]).
منابع مشابه
First-principles theory of quantum well resonance in double barrier magnetic tunnel junctions.
Quantum well (QW) resonances in Fe(001)/MgO/Fe/MgO/Fe double barrier magnetic tunnel junctions are calculated from first principles. By including the Coulomb blockade energy due to the finite size islands of the middle Fe film, we confirm that the oscillatory differential resistance observed in a recent experiment [T. Nozaki, Phys. Rev. Lett. 96, 027208 (2006)10.1103/PhysRevLett.96.027208] orig...
متن کاملAtomic and electronic structure of CoÕSrTiO3 ÕCo magnetic tunnel junctions
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 coupl...
متن کاملThermoelectricity and disorder of FeCo/MgO/FeCo magnetic tunnel junctions
We compute the thermoelectric transport parameterized by the Seebeck coefficient and thermal/electric conductance of random-alloy FeCo/MgO/FeCo(001) magnetic tunnel junctions (MTJs) from first principles using a generalized Landauer-Büttiker formalism. The thermopower is found to be typically smaller than those of Fe/MgO/Fe(001) MTJs. The (magneto-)Seebeck effect is sensitive to the details of ...
متن کاملAtomic, 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...
متن کامل