Coexisting Non-Trivial Van der Waals Magnetic Orders Enable Field-Free Spin-Orbit Torque Magnetization Dynamics

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Van der Waals (vdW) magnetic materials offer unique platforms for exploring exotic magnetic states.
• These materials are crucial for developing energy-efficient spintronic memory and computing technologies.
• Conventional materials often lack the tunable magnetic interactions needed for advanced spintronic applications.

Purpose of the Study:

• To investigate the magnetic properties of the vdW magnet (Co_0.5Fe_0.5)_5-xGeTe₂ (CFGT).
• To explore the potential of CFGT for realizing novel spintronic functionalities.
• To demonstrate field-free magnetization switching using spin-orbit torque (SOT).

Main Methods:

• Experimental synthesis and characterization of CFGT.
• Measurements of magnetic orders, including ferromagnetic and antiferromagnetic states.
• Fabrication of heterostructures with Platinum (Pt) for SOT studies.
• Density functional theory (DFT) and Monte Carlo simulations for theoretical validation.

Main Results:

• Discovery of coexisting ferromagnetic and antiferromagnetic orders in CFGT above room temperature.
• Observation of intrinsic exchange bias and canted perpendicular magnetism in CFGT.
• Demonstration of energy-efficient, magnetic field-free, and deterministic SOT switching of CFGT in a Pt/CFGT heterostructure.

Conclusions:

• CFGT exhibits non-trivial intrinsic magnetic order, enabling advanced spintronic applications.
• The discovered magnetic properties pave the way for field-free SOT magnetization dynamics.
• This research highlights the potential of vdW magnets for next-generation spintronic devices.