Interfacial charge accumulation effect on magnetic domain wall   nucleation and propagation in a Pt/Co/Pt/Al2O3 structure
  We report direct observation of charge accumulation effect on magnetization reversal in a Pt/Co(0.5 nm)/Pt(0.5 nm)/Al2O3 structure with perpendicular anisotropy. By imaging magnetic domain with polar Kerr microscopy, we evidence that positive charges accumulating at the Pt/Al2O3 interface result in favoring magnetic domain wall propagation, while negative charges hinder domain wall nucleation and propagation. Our results suggest that magnetic properties in Co layer can be strongly influenced by 5d electron accumulation/depletion in an ultrathin Pt layer. 
Weiwei Lin, Nicolas Vernier, Guillaume Agnus, Na Lei, Sylvain Eimer   and Dafin\'e Ravelosona
cond-mat.mtrl-sci cond-mat.mes-hall physics.app-ph