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Publication Citation: Ab Initio Studies of the Spin-Transfer Torque in Tunnel Junctions

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Author(s): Christian Heiliger; Mark D. Stiles;
Title: Ab Initio Studies of the Spin-Transfer Torque in Tunnel Junctions
Published: May 09, 2008
Abstract: We calculate the spin-transfer torque in Fe/MgO/Fe tunnel junctions and analyze the results in comparison to all-metallic junctions. We show that the spin-transfer torque is interfacial in the ferromagnetic layer to a greater degree than in spin-valve systems. This result originates in the half metallic behavior of Fe for the Δ sub 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 which is linear in the bias. However, observation of such a torque requires highly ideal samples.
Citation: Physical Review Letters
Volume: 100
Issue: 18
Pages: 4 pp.
Keywords: electronic structure,Fe/MgO/Fe,magnetic random access memory,magnetotransport,spin transfer torque,tunnel junctions
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (259KB)