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High-Tc Ferromagnetic Semiconductor in Thinned 3D Ising Ferromagnetic Metal Fe3GaTe2
Nano Letters ( IF 9.6 ) Pub Date : 2024-01-08 , DOI: 10.1021/acs.nanolett.3c04462
Zhaoxu Chen 1, 2 , Yuxin Yang 1, 3 , Tianping Ying 1 , Jian-Gang Guo 1
Affiliation  

Emergent phenomena in exfoliated layered transition metal compounds have attracted much attention in the past several years. Especially, pursuing a ferromagnetic insulator is one of the exciting goals for stimulating a high-performance magnetoelectrical device. Here, we report the transition from a metallic to high-Tc semiconductor-like ferromagnet in thinned Fe3GaTe2, accompanied with competition among various magnetic interactions. As evidenced by critical exponents, Fe3GaTe2 is the first layered ferromagnet described by a 3D Ising model coupled with long-range interactions. An extra magnetic phase from competition between ferromagnetism and antiferromagnetism emerges at a low field below Tc. Upon reducing thickness, the Curie temperature (Tc) monotonically decreases from 342 K for bulk to 200 K for 1–3 nm flakes, which is the highest Tc reported as far as we know. Furthermore, a semiconductor-like behavior has been observed in such 1–3 nm flakes. Our results highlight the importance of Fe3GaTe2 in searching for ferromagnetic insulators, which may benefit spintronic device fabrication.

中文翻译:


薄化 3D Ising 铁磁金属 Fe3GaTe2 中的高温铁磁半导体



在过去的几年里,剥离的层状过渡金属化合物的新兴现象引起了人们的广泛关注。特别是,追求铁磁绝缘体是刺激高性能磁电器件的令人兴奋的目标之一。在这里,我们报告了薄化 Fe 3 GaTe 2中从金属到类高温半导体磁体的转变,并伴随着各种磁相互作用之间的竞争。临界指数证明,Fe 3 GaTe 2是第一个通过 3D Ising 模型与长程相互作用描述的层状铁磁体。铁磁性和反铁磁性之间的竞争产生的额外磁相出现在低于T c的低磁场中。厚度减小后,居里温度 ( T c ) 从块状材料的 342 K 单调下降到 1-3 nm 薄片的 200 K,这是据我们所知报道的最高T c 。此外,在这种 1-3 nm 的薄片中观察到类似半导体的行为。我们的结果强调了 Fe 3 GaTe 2在寻找铁磁绝缘体中的重要性,这可能有利于自旋电子器件的制造。
更新日期:2024-01-08
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