Surface Acoustic Wave Driven Acoustic Spin Splitter in d-Wave Altermagnetic Thin Films

Area of Science:

• Spintronics
• Materials Science
• Acoustics

Background:

• Spin current generation is crucial for spintronics.
• Altermagnetic materials offer unique spin properties via electrons and magnons.

Purpose of the Study:

• To propose and analyze the use of surface acoustic waves (SAWs) for generating spin currents in altermagnetic thin films.
• To demonstrate the concept of an acoustic spin splitter for spintronics applications.

Main Methods:

• Theoretical analysis of SAW-driven spin currents in metallic and insulating altermagnets.
• Modeling of a device incorporating a heavy metal layer (e.g., platinum) for inverse spin Hall effect detection.
• Calculation of spin current and inverse spin Hall voltage for realistic material parameters.

Main Results:

• SAWs can effectively generate spin currents carried by both charge carriers and magnons in altermagnetic films.
• The proposed acoustic spin splitter is applicable to both metallic and insulating altermagnets.
• Tunable SAW frequency allows precise control over the generated spin current.

Conclusions:

• The acoustic spin splitter presents a novel and versatile method for spin current generation and detection in altermagnetic materials.
• This approach has broad material applicability and significant potential for future spintronics technologies.
• Precise control via SAW frequency tuning enhances its utility for advanced spintronics applications.