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The influence of the tantalum buffer layer on the magnetic anisotropy ofperpendicular Co-Fe-B/MgO based magnetic tunnel junctions is studied usingmagneto-optical Kerr-spectroscopy. Samples without a tantalum buffer are foundto exhibit no perpendicular magnetization. The transport of Boron into thetantalum buffer is considered to play an important role on the switchingcurrents of those devices. With the optimized layer stack of a perpendiculartunnel junction, a minimal critical switching current density of only 9.2kA/cm$^2$ is observed. As of today, this value is the lowest reported value forcurrent-induced magnetization reversal.

Spin-transfer torque switching at ultra low current densities