Multi-band character revealed from Weak-antilocalization effect in Platinum thin films

Abstract

Platinum (Pt) has been very much used for spin-charge conversion in spintronics research due to it's large intrinsic spin-orbit interaction. Magnetoconductance originated from weak-antilocalization effect in quantum interference regime is used as a powerful tool to obtain the microscopic information of spin-orbit interaction and coherence phase breaking scattering process among itinerant electrons. To acquire the knowledge of different types of scattering processes, we have performed magnetoconductance study on Pt thin films which manifests multi-band (multi-channel) conduction. An extensive analysis of quantum interference originated weak-antilocalization effect reveals the existence of strong (weak) inter-band scattering between two similar (different) orbitals. Coherence phase breaking lengths ($l_{\varphi }$) and their temperature dependence are found to be significantly different for these two conducting bands. The observed effects are consistent with theoretical predication that there exist three Fermi-sheets with one $s$ and two $d$ orbital character. This study provides the evidence of two independent non-similar conducting channels and presence of anisotropic spin-orbit interaction along with $e$-$e$ correlation in Pt thin films.

9 pages, 9 figure

References in corpus (22)

• Spintronics: Fundamentals and applications
• Spin torque switching with the giant spin Hall effect of tantalum
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Direct electronic measurement of the spin Hall effect
• Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system
• Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3
• Room Temperature Reversible Spin Hall Effect
• Intrinsic spin Hall effect in platinum metal
• Unified explanation of the Kadowaki-Woods ratio in strongly correlated materials
• Scalable T^2 resistivity in a small single-component Fermi surface
• Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt
• Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths
• Interaction corrections at intermediate temperatures: dephasing time
• Ultrafast spin-currents and charge conversion at 3d-5d interfaces probed by time-domain terahertz spectroscopy
• Weak antilocalization and disorder-enhanced electron interactions in crystalline GeSbTe
• Weak Localization Effects as Evidence for Bulk Quantization in Thin Films Bi2Se3
• Robust weak antilocalization due to spin-orbital entanglement in Dirac material Sr${}_3$SnO
• Electron-electron interaction correction and magnetoresistance in tilted fields in Si-based 2D systems
• Quenching of Impurity Spins at Cu/CuO Interfaces: An Antiferromagnetic Proximity Effect
• The mechanism of spin-orbit coupling in a 2D oxide interface
• Effect of interfacial intermixing on spin-orbit torque in Co/Pt bilayers
• Evidence for weak antilocalization-weak localization crossover and metal-insulator transition in CaCu${}_3$Ru${}_4$O${}_{12}$ thin films