The current-induced effective field in perpendicularly magnetized Ta/CoFeB/MgO wire was investigated. A threshold field decrease of 6.4 kOe/mA was observed by measuring the threshold field of Hall resistance versus the magnetic field curve with various bias currents. The decrease was probably caused by the in-plane effective field, mainly due to the Rashba effect. The effective field of the Ta/CoFeB/MgO wire was smaller and opposite in direction compared to that of Pt/Co/AlOx previously reported.

Three dimensional nano-seeding assembly of ferromagnetic Fe/LaSrFeO4 nano-hetero dot array J. Appl. Phys. 112, 024320 (2012) Influence of transverse fields on domain wall pinning in ferromagnetic nanostripes J. Appl. Phys. 112, 023911 (2012) Interfacial current-induced torques in Pt/Co/GdOx Appl. Phys. Lett. 101, 042405 (2012) Simultaneous magneto-optical Kerr effect and Sixtus-Tonks method for analyzing the shape of propagating domain walls in ultrathin magnetic wires Rev. Sci. Instrum. 83, 064708 (2012) Additional information on Appl. Phys. Lett.