Calculating the spin memory loss at Cu$|$metal interfaces from first principles

Abstract

The role played by interfaces in metallic multilayers is not only to change the momenta of incident electrons; their symmetry lowering also results in an enhancement of the effects of spin-orbit coupling, in particular the flipping of the spins of conduction electrons. This leads to a significant reduction of a spin current through a metallic interface that is quantitatively characterized by a dimensionless parameter $\delta$ called the spin memory loss (SML) parameter, the interface counterpart of the spin-flip diffusion length for bulk metals. In this paper we use first-principles scattering calculations that include temperature-induced lattice and spin disorder to systematically study three parameters that govern spin transport through metallic interfaces of Cu with Pt, Pd, Py (permalloy) and Co: the interface resistance, spin polarization and the SML. The value of $\delta$ for a Cu$|$Pt interface is found to be comparable to what we recently reported for a Au$|$Pt interface [Gupta {\it et al.}, Phys. Rev. Lett. 124, 087702 (2020)]. For Cu$|$Py and Cu$|$Co interfaces, $\delta$ decreases monotonically with increasing temperature to become negligibly small at room temperature. The calculated results are in good agreement with currently available experimental values in the literature. Inserting a Cu layer between Pt and the Py or Co layers slightly increases the total spin current dissipation at these "compound" interfaces.

References in corpus (18)

• Spin Transfer Torques
• Spin Seebeck insulator
• Theory of magnon-driven spin Seebeck effect
• Non-collinear Magnetoelectronics
• Temperature dependence of spin diffusion length and spin Hall angle in Au and Pt
• Evolution of the spin Hall effect in Pt nanowires: Size and temperature effects
• Interface enhancement of Gilbert damping from first-principles
• Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt
• Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths
• Fully Spin-transparent magnetic interfaces enabled by insertion of a paramagnetic NiO layer
• Spin-memory loss due to spin-orbit coupling at ferromagnet/heavy-metal interfaces: Ab initio spin-density matrix approach
• Direct Method for Calculating Temperature-Dependent Transport Properties
• Gilbert damping in noncollinear ferromagnets
• Calculating spin transport properties from first principles: spin currents
• Spin-orbit-coupling induced domain-wall resistance in diffusive ferromagnets
• Anisotropic Spin Relaxation Induced by Surface Spin-Orbit Effects
• Spin-memory loss induced by bulk spin-orbit coupling at ferromagnet/heavy-metal interfaces
• Calculating interface transport parameters at finite temperatures: Nonmagnetic interfaces

Cited by in corpus (1)

• Calculating interface transport parameters at finite temperatures: Nonmagnetic interfaces