Electric-Field-Induced Two-Dimensional Fully Compensated Ferrimagnetism and Emergent Transport Phenomena

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Altermagnetism shows spin-split bands in materials with zero net magnetization.
• Fully compensated ferrimagnetic (fFIM) systems, also with zero net magnetization and spin-split bands, are less explored.
• Controlling magnetic states with external fields is crucial for advanced electronic devices.

Purpose of the Study:

• To investigate the potential of monolayer CoS and CoSe in achieving fFIM states.
• To explore the effects of external electric fields on the electronic and magnetic properties of these materials.
• To identify potential spintronic applications arising from induced fFIM states.

Main Methods:

• First-principles calculations were employed to model the electronic band structures.
• Theoretical analysis was used to understand the magnetic properties and symmetry breaking.
• Simulations focused on the behavior of monolayer CoS and CoSe under an external electric field.

Main Results:

• Monolayer CoS and CoSe exhibit collinear antiferromagnetic ground states.
• An external electric field breaks $\mathrm{PT}$ symmetry, inducing fFIM states with significant spin splitting.
• The induced fFIM states support spin-polarized currents, anomalous Hall effects, and magneto-optical Kerr and Faraday effects.

Conclusions:

• Monolayer CoS and CoSe are promising candidates for realizing electric-field-controlled fFIM states.
• These materials offer a new platform for developing advanced spintronic devices.
• The study highlights the potential of external electric fields to manipulate complex magnetic phenomena.