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Si-CMOS Compatible Synthesis of Wafer-Scale 1T-CrTe₂ with Step-Like Magnetic Transition.

Jiwei Liu^1,2,3, Cong Wang², Yuwei Wang³

¹State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|February 18, 2025

Summary

Researchers developed a cost-effective method for synthesizing wafer-scale 2D chromium telluride (CrTe₂) films. This breakthrough enables potential advancements in spintronic devices by overcoming previous synthesis challenges.

Keywords:

2D magnets low‐temperature synthesis plasma‐enhanced chemical vapor deposition step‐like magnetic transitions

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Two-dimensional (2D) materials offer unique properties for advanced electronics.
Room-temperature ferromagnetism in 2D materials is crucial for spintronics.
Large-scale synthesis of 2D ferromagnets like CrTe₂ remains a significant hurdle.

Purpose of the Study:

To develop a scalable and cost-effective synthesis method for 2D 1T-CrTe₂ films.
To investigate the magnetic properties and anisotropy of synthesized 1T-CrTe₂ films.
To understand the influence of surface adsorption on the magnetic behavior of 1T-CrTe₂.

Main Methods:

Plasma-enhanced chemical vapor deposition (PECVD) at temperatures below 400 °C.
Synthesis on SiO₂/Si substrates for wafer-scale production.
Magnetic hysteresis measurements and theoretical calculations.

Main Results:

Successfully synthesized wafer-scale 1T-CrTe₂ films with controllable properties.
Observed perpendicular magnetic anisotropy and distinct step-like magnetic transitions.
Identified susceptibility to oxygen adsorption and its impact on magnetic anisotropy.
Theoretical calculations confirmed the role of surface oxidation and interlayer coupling.

Conclusions:

Demonstrated a Si-CMOS compatible fabrication approach for magnetic 2D materials.
Highlighted the critical influence of unintentional adsorbents (like oxygen) on magnetic behavior.
Paved the way for practical applications of 2D ferromagnets in spintronics.