AI 中文总结
本研究利用He⁺离子辐照调控CrSBr磁相，通过偏振分辨拉曼光谱检测到原始及辐照诱导的磁相变，证实该方法可用于可控磁相工程。
AI 中文摘要
控制磁相并准确确定其转变温度对低维磁性材料的开发至关重要。本研究表明，He⁺离子辐照为层状CrSBr的磁相工程提供了通用途径，并确立了温度依赖的偏振分辨拉曼光谱作为灵敏光学探针，用于识别辐照诱导的磁相变。研究发现，改性CrSBr的磁响应由辐照剂量和晶体厚度共同决定。拉曼张量元的温度演化可分辨出原始CrSBr在T_N≈132 K处的反铁磁相变，以及辐照诱导的在T_C≈105-110 K（对应铁磁相变）和T_D≈40 K（对应缺陷相关磁相变）处的磁相变。互补的磁光测量证实，反铁磁序逐渐被抑制，同时出现新的缺陷工程磁相，包括高辐照剂量下的纯铁磁行为。这些发现确立了辐照CrSBr作为可控磁相工程的平台，同时证明偏振分辨拉曼光谱是探测范德华磁体中磁相变的快速、无损且广泛适用的方法。
英文摘要
Controlling magnetic phases and accurately determining their transition temperatures are essential for the development of low-dimensional magnetic materials. Here, we demonstrate that He$^+$ ion irradiation provides a versatile route for engineering magnetic phases in layered CrSBr and establish temperature-dependent polarization-resolved Raman spectroscopy as a sensitive optical probe for identifying irradiation-induced magnetic phase transitions. We reveal that the magnetic response of the modified CrSBr is governed by both irradiation dose and crystal thickness. The temperature evolution of the Raman tensor elements resolves the antiferromagnetic transition in pristine CrSBr at T$_N \approx 132$ K as well as irradiation-induced magnetic transitions at T$_C \approx 105-110$ K and T$_D \approx 40$ K corresponding to ferromagnetic and defect-related magnetic phase transitions. Complementary magneto-optical measurements confirm the progressive suppression of antiferromagnetic order and the emergence of new defect-engineered magnetic phases, including pure ferromagnetic behavior at high irradiation doses. These findings establish irradiated CrSBr as a platform for controllable magnetic phase engineering while demonstrating polarization-resolved Raman spectroscopy as a rapid, non-destructive, and broadly applicable method for probing magnetic phase transitions in van der Waals magnets.
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