Electrical Detection of Magnetic Spin Textures Using Pure Spin Currents in Graphene

Area of Science:

• Spintronics
• Condensed Matter Physics
• Materials Science

Background:

• Electrical control and detection of magnetic spin textures are crucial for next-generation data storage and logic devices.
• All-electrical methods offer practical advantages for integrating magnetic texture detection into electronic circuits.

Purpose of the Study:

• To demonstrate the electrical detection of diverse magnetic multidomain and vortex patterns.
• To utilize pure spin-polarized electronic transport in graphene spin-valve devices for this detection.

Main Methods:

• Fabrication of graphene spin-valve devices with specifically patterned ferromagnetic electrodes.
• Injection of spin-polarized current from engineered electrodes into a graphene channel.
• Detection of the spin current using a reference ferromagnetic electrode with a quasi-single domain.

Main Results:

• Successful electrical detection of various magnetic multidomain and vortex patterns.
• Observation of distinct multilevel spin-valve switching patterns correlating with domain configurations.
• Validation of electrode magnetization through magnetic force microscopy and micromagnetic simulations.

Conclusions:

• The study successfully demonstrates all-electrical detection of magnetic textures in graphene.
• This method utilizes pure spin currents, paving the way for spintronic memory and logic applications.
• It offers a new avenue for probing magnetic domain and spin dynamics electrically.