Ab initio studies of the spin-transfer torque in tunnel junctions

Abstract

We calculate the spin-transfer torque in Fe/MgO/Fe tunnel junctions and compare the results to those for all-metallic junctions. We show that the spin-transfer torque is interfacial in the ferromagnetic layer to a greater degree than in all-metallic junctions. This result originates in the half metallic behavior of Fe for the ${\Delta }_1$ states at the Brillouin zone center; in contrast to all-metallic structures, dephasing does not play an important role. We further show that it is possible to get a component of the torque that is out of the plane of the magnetizations and that is linear in the bias. However, observation of such a torque requires highly ideal samples. In samples with typical interfacial roughness, the torque is similar to that in all-metallic multilayers, although for different reasons.

5 pages, 4 figures

References in corpus (9)

• Anatomy of Spin-Transfer Torque
• Measurement of the Spin-Transfer-Torque Vector in Magnetic Tunnel Junctions
• Currents, Torques, and Polarization Factors in Magnetic Tunnel Junctions
• Spin-transfer-driven ferromagnetic resonance of individual nanomagnets
• Anomalous Bias Dependence of Spin Torque in Magnetic Tunnel Junctions
• Magnetoresistance and spin-transfer torque in magnetic tunnel junctions
• Current Induced Order Parameter Dynamics: Microscopic Theory Applied to Co/Cu/Co spin valves
• Implementation of a non-equilibrium Green's function method to calculate spin transfer torque
• Quantum oscillation of magnetoresistance in tunneling junctions with a nonmagnetic spacer

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