Current-Induced Domain Wall Motion in a Compensated Ferrimagnet

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Studying antiferromagnetic materials is difficult due to challenges in detecting and manipulating their magnetic states.
• Electrical methods for investigating switching dynamics in these materials are complex.

Purpose of the Study:

• To experimentally investigate current-induced domain wall dynamics in antiferromagnetically coupled systems.
• To understand the mechanisms behind fast domain wall motion and reveal internal domain wall structures.

Main Methods:

• Utilizing heavy-metal-rare-earth-transition-metal alloy bilayers for experiments.
• Employing theoretical modeling alongside experimental data analysis.
• Investigating domain wall chirality and its dependence on sublattice spin orientations.

Main Results:

• Current-induced domain wall mobility peaks at the angular momentum compensation point.
• Internal domain wall structures and fast motion mechanisms were elucidated.
• Domain wall chirality remains consistent across compensation points, unaffected by net magnetization.

Conclusions:

• The study reveals that sublattice spin orientations, not net magnetization, dictate Dzyaloshinskii-Moriya interaction in specific bilayers.
• High domain wall mobility and stable chirality in compensated ferrimagnetic materials offer potential for advanced spintronic devices.