Scanning inverse spin Hall effect spectrometer by shorted coaxial probes

Area of Science:

• Spintronics
• Condensed Matter Physics
• Materials Science

Background:

• Characterizing spin transport is crucial for developing advanced spintronic devices.
• Existing methods for measuring spin properties can be time-consuming and complex.

Purpose of the Study:

• To develop a high-throughput scanning system for characterizing spin transport properties.
• To investigate spin transport in Py/Ta bilayers using the developed system.

Main Methods:

• Built a scanning inverse spin Hall effect measurement system utilizing a shorted coaxial resonator.
• Performed spin pumping measurements on patterned Py/Ta bilayer stripes with varying Ta thicknesses.
• Analyzed spin diffusion length, conductivity, and spin Hall angle.

Main Results:

• Determined a spin diffusion length of approximately 4.2 nm for Ta.
• Calculated Ta conductivity as 7.5 × 10^5 Ω⁻¹ m⁻¹.
• Estimated the spin Hall angle of Ta to be -0.014 at room temperature.

Conclusions:

• The intrinsic spin relaxation mechanism in Ta is attributed to Elliott-Yafet interactions.
• The developed system offers a convenient, efficient, and nondestructive method for spintronic material characterization.
• This work facilitates the discovery of new spintronic materials and the understanding of their transport mechanisms.