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The giant spin Hall effect in magnetic heterostructures along with low spinmemory loss and high interfacial spin mixing conductance are prerequisites torealize energy efficient spin torque based logic devices. We report giant spinHall angle (SHA) of 28.67 (5.09) for W (Ta) interfaced epi- Co60Fe40/TiNstructures. The spin-orbit torque switching current density (J_Crit) is as lowas 1.82 (8.21) MA/cm2 in W (Ta)/Co60Fe40(t_CoFe)/TiN structures whose originlies in the epitaxial interfaces. These structures also exhibit very low spinmemory loss and high spin mixing conductance. These extraordinary values of SHAand therefore ultra-low J_Crit in semiconducting industry compatible epitaxialmaterials combinations open up a new direction for the realization of energyefficient spin logic devices by utilizing epitaxial interfaces.

Extraordinary efficient spin-orbit torque switching in (W, Ta)/epitaxial-Co60Fe40/TiN heterostructures