Air-Stable and Layer-Dependent Ferromagnetism in Atomically Thin van der Waals CrPS4,ACS Nano

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Air-Stable and Layer-Dependent Ferromagnetism in Atomically Thin van der Waals CrPS4
ACS Nano ( IF 15.8 ) Pub Date : 2021-10-18 , DOI: 10.1021/acsnano.1c07860
Joolee Son _{1,

2} , Suhan Son _{1,

3,

4} , Pyeongjae Park _{1,

3,

4} , Maengsuk Kim ₅ , Zui Tao ₆ , Juhyun Oh ₇ , Taehyeon Lee ₁ , Sanghyun Lee ₈ , Junghyun Kim _{1,

3,

4} , Kaixuan Zhang _{1,

3,

4} , Kwanghee Cho ₉ , Takashi Kamiyama ₉ , Jun Hee Lee ₅ , Kin Fai Mak ₆ , Jie Shan ₆ , Miyoung Kim ₇ , Je-Geun Park _{1,

3,

4} , Jieun Lee _{1,

2}

Affiliation

Ferromagnetism in two-dimensional materials presents a promising platform for the development of ultrathin spintronic devices with advanced functionalities. Recently discovered ferromagnetic van der Waals crystals such as CrI₃, readily isolated two-dimensional crystals, are highly tunable through external fields or structural modifications. However, there remains a challenge because of material instability under air exposure. Here, we report the observation of an air-stable and layer-dependent ferromagnetic (FM) van der Waals crystal, CrPS₄, using magneto-optic Kerr effect microscopy. In contrast to the antiferromagnetic (AFM) bulk, the FM out-of-plane spin orientation is found in the monolayer crystal. Furthermore, alternating AFM and FM properties observed in even and odd layers suggest robust antiferromagnetic exchange interactions between layers. The observed ferromagnetism in these crystals remains resilient even after the air exposure of about a day, providing possibilities for the practical applications of van der Waals spintronics.

中文翻译：

原子级薄范德华 CrPS4 中的空气稳定和层相关铁磁性

二维材料中的铁磁性为开发具有先进功能的超薄自旋电子器件提供了一个有前景的平台。最近发现的铁磁范德华晶体，如 CrI ₃，容易分离的二维晶体，可通过外部场或结构修改高度可调。然而，由于空气暴露下的材料不稳定性，仍然存在挑战。在这里，我们报告了对空气稳定且依赖于层的铁磁 (FM) 范德瓦尔斯晶体 CrPS _{4 的}观察结果，使用磁光克尔效应显微镜。与反铁磁 (AFM) 块体相比，在单层晶体中发现了 FM 面外自旋取向。此外，在偶数层和奇数层中观察到的交替 AFM 和 FM 特性表明层之间存在强大的反铁磁交换相互作用。在这些晶体中观察到的铁磁性即使在空气暴露约一天后仍保持弹性，为范德瓦尔斯自旋电子学的实际应用提供了可能性。

更新日期：2021-10-26

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