A radio frequency/direct current hybrid rotatable spin torque ferromagnetic resonance platform

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Spin torque ferromagnetic resonance (ST-FMR) is crucial for studying spin-dependent transport phenomena.
• Conventional ST-FMR systems often face limitations in achieving full sample rotation and handling high power inputs.
• Advancements in spintronic device research require versatile platforms for precise material characterization.

Purpose of the Study:

• To develop and demonstrate a novel hybrid rotational ST-FMR platform.
• To integrate radio frequency (RF) and direct current (DC) capabilities for enhanced experimental control.
• To enable precise temperature-dependent measurements of spintronic material properties.

Main Methods:

• Integration of conductive slip ring technology with a conventional ST-FMR system.
• Implementation of a rotational stage allowing 360° sample manipulation.
• Application of high voltage DC (up to 600 V/10 A) and high frequency RF (up to 40 GHz) sources.
• Utilizing DC ports for in-situ heating and temperature measurements.

Main Results:

• Achieved stable 360° sample rotation with minimal variation (<1% in DC resistance, <2% in S-parameters).
• Successfully integrated high power RF and DC sources into the ST-FMR setup.
• Obtained temperature dependence of spin Hall efficiency from 20-70°C.
• Demonstrated the platform's capability for accurate heating and temperature measurements.

Conclusions:

• The developed hybrid rotational ST-FMR platform is a valuable and scalable tool.
• This platform advances research in spin-dependent transport and regulation.
• It facilitates the development of next-generation spintronic devices through precise characterization.