Fe₃GaTe₂中压力增强层间交换耦合揭示的层间铁磁有序
Interlayer ferromagnetic order revealed through pressure-enhanced interlayer exchange coupling in Fe$_3$GaTe$_2$
- The University of Osaka（大阪大学）
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AI总结：
本研究通过静水压调控Fe₃GaTe₂单晶的层间耦合，发现两个特征温度的压力依赖特性，结合第一性原理计算建立了层间磁有序的预测框架。
AI中文摘要：
范德华铁磁体尽管具有层状晶体结构，仍存在有限的层间磁耦合，该耦合对决定其磁性能起重要作用。本研究对高质量Fe₃GaTe₂单晶进行磁化测量，同时利用静水压选择性调控层间耦合。我们在居里温度以下确定了两个特征温度T_inf1和T_inf2，二者具有相反的压力依赖关系：T_inf1与热激活的畴壁脱钉相关，T_inf2反映层间铁磁有序的形成。两个温度均表现出显著的压力依赖性，这与层内铁磁有序对应的几乎压力无关的居里温度形成鲜明对比。第一性原理计算揭示压力诱导的层间交换相互作用大幅增强，且合理再现了T_inf2及其压力依赖性。这些结果表明，层间磁有序的出现可通过微观层间交换耦合预测，为理解和设计层状磁性材料中的层间耦合现象建立了预测框架。
英文摘要：
Van der Waals ferromagnets possess finite interlayer magnetic coupling despite their layered crystal structures, and this coupling plays an important role in determining their magnetic properties. In this study, we performed magnetization measurements on high-quality Fe$_3$GaTe$_2$ single crystals while selectively tuning the interlayer coupling using hydrostatic pressure. We identified two characteristic temperatures, $T_{\rm inf1}$ and $T_{\rm inf2}$, below the Curie temperature with opposite pressure dependences: $T_{\rm inf1}$ is associated with thermally activated domain-wall depinning, whereas $T_{\rm inf2}$ reflects the formation of interlayer ferromagnetic order. Both temperatures exhibit pronounced pressure dependences, in sharp contrast to the nearly pressure-independent Curie temperature associated with intralayer ferromagnetic order. First-principles calculations revealed a substantial pressure-induced enhancement of the interlayer exchange interaction and reasonably reproduced $T_{\rm inf2}$ and its pressure dependence. These results demonstrate that the emergence of interlayer magnetic ordering can be predicted from the microscopic interlayer exchange coupling, establishing a predictive framework for understanding and designing interlayer coupling phenomena in layered magnetic materials.
