Spintronic Devices upon 2D Magnetic Materials and Heterojunctions.

Area of Science:

• Spintronics and materials science, focusing on two-dimensional (2D) magnetic materials.

Background:

• Growing interest in 2D magnetic materials due to their layered structure and van der Waals stacking.
• Emergence of spin-orbit torque (SOT) devices and tunneling magnetoresistance (TMR) effect as key research areas.
• Potential of 2D materials for high-performance spintronic devices like magnetic tunnel junctions (MTJ) and spin valves.

Purpose of the Study:

• To provide a comprehensive review of 2D SOT heterojunctions, covering their construction, measurement, and mechanisms.
• To review the physical mechanisms and device designs for TMR effects in 2D materials.
• To highlight advancements in integrating 2D materials into SOT, MTJ, and spin valve devices.

Main Methods:

• Review of existing literature on 2D SOT heterojunctions.
• Analysis of mechanisms for SOT-driven magnetization switching and TMR effects.
• Summary of different 2D heterojunction structures and factors enhancing TMR values.

Main Results:

• 2D SOT heterojunctions enable efficient SOT-driven magnetization switching, with symmetry breaking leading to field-free switching and low current densities (down to 10^6 A/cm^2).
• The TMR effect in 2D materials, particularly in layered antiferromagnets, can achieve giant TMR ratios (approaching 19,000%) due to the spin-filter effect.
• Advancements in 2D material integration offer high-density storage, low-power computing, and fast data transmission.

Conclusions:

• 2D magnetic materials are crucial for developing high-performance spintronic devices.
• SOT and TMR effects in 2D heterojunctions show significant promise for magnetic storage and logic integrated circuits.
• These advancements are poised to revolutionize information technology with improved Magnetic Random Access Memory (MRAM) and computing capabilities.