Multiple magneto-ionic regimes in Ta/Co${}_{20}$Fe${}_{60}$B${}_{20}$/HfO${}_2$

R. Pachat, D. Ourdani, J. W. van der Jagt +11

In Ta/CoFeB/HfO2 stacks a gate voltage drives, in a nonvolatile way, the system from an underoxidized state exhibiting in-plane anisotropy (IPA) to an optimum oxidation level resul…