Modulated spin orbit torque in a Pt/Co/Pt/YIG multilayer by nonequilibrium proximity effect.

Authors :: Liu, Q. B.
Meng, K. K.
Cai, Y. Z.
Qian, X. H.
Wu, Y. C.
Zheng, S. Q.
Jiang, Y.
Source :: Applied Physics Letters; 1/15/2018, Vol. 112 Issue 2, p1-N.PAG, 5p
Publication Year :: 2018
Abstract: We have compared the spin orbit torque (SOT) induced magnetization switching in Pt/Co/Pt/ Y<subscript>3</subscript>Fe<subscript>5</subscript>O<subscript>12</subscript> (YIG) and Pt/Co/Pt/SiO<subscript>2</subscript> multilayers. The critical switching current in Pt/Co/Pt/YIG is almost half of that in Pt/Co/Pt/SiO<subscript>2</subscript>. Through harmonic measurements, we demonstrated the enhancement of the effective spin Hall angle in Pt/Co/Pt/YIG. The increased efficiency of SOT is ascribed to the nonequilibrium proximity effect at the Pt/YIG interface, which suppresses the spin current reflection and enhances the effective spin accumulation at the Co/Pt interface. Our method can effectively reduce the switching current density and provide another way to modulate SOT. [ABSTRACT FROM AUTHOR]

Subjects :: SPIN-orbit coupling constants
SPIN transfer torque
PROXIMITY effect (Superconductivity)
HALL effect
MAGNETIZATION

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