Enhancement of the Anti-Damping Spin Torque Efficacy of Platinum by Interface Modification

Abstract

We report a strong enhancement of the efficacy of the spin Hall effect (SHE) of Pt for exerting anti-damping spin torque on an adjacent ferromagnetic layer by the insertion of $\approx$ 0.5 nm layer of Hf between a Pt film and a thin, < 2 nm, Fe${}_{60}$Co${}_{20}$B${}_{20}$ ferromagnetic layer. This enhancement is quantified by measurement of the switching current density when the ferromagnetic layer is the free electrode in a magnetic tunnel junction. The results are explained as the suppression of spin pumping through a substantial decrease in the effective spin-mixing conductance of the interface, but without a concomitant reduction of the ferromagnet\' s absorption of the SHE generated spin current.

arXiv commentMain text and Supplementary material

References in corpus (18)

• Spin torque switching with the giant spin Hall effect of tantalum
• Spin Hall effect
• Enhanced Gilbert Damping in Thin Ferromagnetic Films
• Current-driven dynamics of chiral ferromagnetic domain walls
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Spin transfer torque devices utilizing the giant spin Hall effect of tungsten
• Theory of spin Hall magnetoresistance
• Role of transparency of platinum-ferromagnet interface in determining intrinsic magnitude of spin Hall effect
• Domain wall motion governed by the spin Hall effect
• Current induced torques and interfacial spin-orbit coupling: Semiclassical Modeling
• Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
• Thermally-Activated Magnetic Reversal Induced by a Spin-Polarized Current
• Enhancement of Perpendicular Magnetic Anisotropy and Transmission of Spin-Hall-Effect-Induced Spin Currents by a Hf Spacer Layer in W/Hf/CoFeB/MgO Layer
• Enhancement of the Anti-Damping Spin Torque Efficacy of Platinum by Interface Modification
• Spin transport parameters in metallic multilayers determined by ferromagnetic resonance measurements of spin pumping
• Current-induced transverse spin wave instability in a thin nanomagnet
• Interfacial Dzyaloshinskii-Moriya interaction in Ta\Co20Fe60B20\MgO nanowires
• Role of spin mixing conductance in spin pumping: enhancement of spin pumping efficiency in Ta/Cu/Py structures

Cited by in corpus (40)

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