“Current-induced switching of perpendicularly-magnetized magnetic layers using spin torque from the spin Hall effect.” L. Q. Liu, O. J. Lee, T. J. Gudmundsen, D. C. Ralph and R. A. Buhrman. Phys. Rev. Lett. 109, 096602 (2012). https://doi.org/10.1103/PhysRevLett.109.096602

“Current-driven magnetization reversal and spin-wave excitations in Co/Cu/Co pillars,” J. A. Katine, F. J. Albert, R. A Buhrman, E. B. Myers, and D. C. Ralph, Phys. Rev. Lett. 84, 3149-3152 (2000): https://doi.org/10.1103/PhysRevLett.84.3149

“Strong perpendicular magnetic anisotropy energy density at Fe alloy/HfO2 interfaces.” Y.Ou, D. C. Ralph, R. A. Buhrman, Applied Physics Letters 110, 192403, (2017). http://dx.doi.org/10.1063/1.4983170