Designing giant Hall response in layered topological semimetals

Area of Science:

• Condensed Matter Physics
• Materials Science
• Chemistry

Background:

• Noncoplanar magnets are crucial for spintronics applications.
• Discovering and designing such materials presents significant challenges.
• Existing materials often lack the desired properties for advanced spintronic devices.

Purpose of the Study:

• To develop a novel chemical design strategy for identifying noncoplanar magnets.
• To explore Ln3Sn7 (Ln = Dy, Tb) as a new class of noncoplanar magnetic materials.
• To investigate the spintronic properties, including Hall response and carrier mobility, of these materials.

Main Methods:

• Targeting layered materials with decoupled magnetic sublattices and dissimilar single-ion anisotropies.
• Combining these with a square-net topological semimetal sublattice.
• Synthesizing and characterizing the Ln3Sn7 materials, measuring their electrical and magnetic properties.

Main Results:

• Successfully identified a series of noncoplanar magnets, Ln3Sn7 (Ln = Dy, Tb).
• Ln3Sn7 exhibits high carrier mobilities exceeding 17,000 cm²·V⁻¹·s⁻¹.
• Observed a giant Hall response with an anomalous Hall angle of 0.17 and Hall conductivity over 42,000 Ω⁻¹·cm⁻¹.

Conclusions:

• The chemical design strategy is effective for discovering novel noncoplanar magnets.
• Ln3Sn7 materials demonstrate superior performance compared to established benchmarks like Co3Sn2S2.
• These findings open new avenues for advanced spintronic applications using noncoplanar magnetic materials.