Title :
Spin orbit torque switching in Ta/CoFeB/MgO without longitudinal fields
Author :
Conte, R. Lo ; Hrabec, A. ; Mihai, A. ; Schulz, T. ; Noh, S. ; Marrows, C. ; Moore, T. ; Klaeui, M.
Author_Institution :
Phys., Johannes Gutenberg- Univ. Mainz, Mainz, Germany
Abstract :
The study investigates the perpendicular magnetic anisotropy in a nanowire made of Ta/CoFeB/MgO where magnetization switching has been observed by Kerr microscopy. Acting torques are then determined by measuring the effect of in-plane external magnetic field on switching. From the symmetry of switching, it is confirmed that switching effect is strictly linked to the spin current generated in the heavy metal when an electric current is injected in plane through the stack. Domain wall speed is also calculated for switching mechanism based on domain nucleation and domain wall motion.
Keywords :
Kerr magneto-optical effect; boron alloys; cobalt alloys; iron alloys; magnesium compounds; magnetic domain walls; magnetic multilayers; magnetic switching; nanomagnetics; nanowires; optical microscopy; perpendicular magnetic anisotropy; spin polarised transport; spin-orbit interactions; tantalum; Kerr microscopy; Ta-CoFeB-MgO; domain nucleation; domain wall motion; domain wall speed; electric current; in-plane external magnetic field; magnetization switching; nanowire; perpendicular magnetic anisotropy; spin current; spin-orbit torque switching; torques; Current measurement; Magnetic field measurement; Magnetic fields; Magnetization; Microscopy; Nanowires; Switches;
Conference_Titel :
Magnetics Conference (INTERMAG), 2015 IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7321-7
DOI :
10.1109/INTMAG.2015.7156646
