Determination of the spin Hall angle in single-crystalline Pt films from spin pumping experiments

Abstract

We report on the determination of the spin Hall angle and the identification of the role of the interface roughness for the inverse spin Hall effect (ISHE) in ultra-clean, defect-reduced epitaxial Pt films. By applying vector network analyzer ferromagnetic resonance spectroscopy to a series of single crystalline Fe (12 nm) /Pt (t${}_{\text{Pt}}$) bilayers we determine the real part of the spin mixing conductance $(4.4\pm 0.2)\cdot 10^{19}$m${}^{-2}$ and reveal a very small spin diffusion length in the epitaxial Pt $(1.1\pm 0.1)$ nm film. We investigate the spin pumping and ISHE in a stripe microstucture excited by a microwave coplanar waveguide (CPW) antenna. By using their different angular dependencies, we distinguish between spin rectification effects and the inverse spin Hall effect. The relatively large value of the spin Hall angle $(5.7\pm 1.4)\%$ hints that interface engineering by epitaxially grown non-magnetic materials can increase the spin-to-charge current conversion efficiency.

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Cited by in corpus (9)

• Spintronic Sources of Ultrashort Terahertz Electromagnetic Pulses
• Efficient Terahertz Generation Using Fe/Pt Spintronic Emitters Pumped at Different Wavelengths
• Modification of spintronic terahertz emitter performance through defect engineering
• Transport Spin Polarization of Noncollinear Antiferromagnetic Antiperovskites
• Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance
• Charge-Spin Interconversion in Epitaxial Pt Probed by Spin-Orbit Torques in a Magnetic Insulator
• Comprehensive Demonstration of Spin-Hall Hanle Effects in Epitaxial Pt Thin Films
• Large spin to charge conversion in topological superconductor \b{eta}-PdBi2 at room temperature
• Spin transport and magnetic proximity effect in CoFeB/normal metal/Pt trilayers