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通过角分辨硬X射线光电子能谱评估二维MXene/铁磁体界面的起源。

Origin of two-dimensional MXene/ferromagnetic interface evaluated by angle-dependent hard X-ray photoemission spectroscopy.

作者信息

Kumar Prabhat, Tsuda Shunsuke, Yaji Koichiro, Isogami Shinji

机构信息

Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan.

Center for Basic Research on Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan.

出版信息

Sci Technol Adv Mater. 2025 Aug 22;26(1):2551484. doi: 10.1080/14686996.2025.2551484. eCollection 2025.

DOI:10.1080/14686996.2025.2551484
PMID:40917642
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12409894/
Abstract

Emergent ferromagnetism on the surface of two-dimensional (2D) MXene is investigated by X-ray magnetic circular dichroism (XMCD) and angle-dependent hard X-ray photoemission spectroscopy (HAXPES). Focusing on CrN as one of the 2D-MXenes, high quality bilayers of CrN/Co and CrN/Pt are prepared by a magnetron sputtering technique. XMCD reveals the induced magnetic moment of Cr in the CrN/Co interface, while it is not observed in the CrN/Pt interface at room temperature. In order to distinguish the possible origins of either the interlayer magnetic exchange coupling or the charge transfer model as the source of ferromagnetism at the interface, the additional controlled CrN/Cu bilayer, whose work function of Cu is consistent with Co, is prepared. HAXPES spectra for the Cr 2 core level near the interface of CrN/Cu are consistent with that of CrN/Co, indicating that the induced magnetic moment of Cr observed by XMCD for CrN/Co can be attributed to the model of interlayer magnetic exchange coupling, rather than the charge transfer model, leading to emergent ferromagnetism at the interface with 2D-MXene.

摘要

通过X射线磁圆二色性（XMCD）和角分辨硬X射线光电子能谱（HAXPES）研究了二维（2D）MXene表面的新兴铁磁性。以CrN作为二维MXene之一为例，采用磁控溅射技术制备了高质量的CrN/Co和CrN/Pt双层膜。XMCD揭示了CrN/Co界面中Cr的诱导磁矩，而在室温下CrN/Pt界面中未观察到该磁矩。为了区分层间磁交换耦合或电荷转移模型作为界面铁磁性来源的可能起源，制备了额外的可控CrN/Cu双层膜，其Cu的功函数与Co一致。CrN/Cu界面附近Cr 2核心能级的HAXPES光谱与CrN/Co的光谱一致，表明XMCD观察到的CrN/Co中Cr的诱导磁矩可归因于层间磁交换耦合模型，而不是电荷转移模型，从而导致二维MXene界面出现新兴铁磁性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/9732fd1b5f50/TSTA_A_2551484_F0004_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/6d386010166f/TSTA_A_2551484_UF0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/60f4a8ac878f/TSTA_A_2551484_F0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/be63b8f8ae6d/TSTA_A_2551484_F0002_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/5bd0d9d75d48/TSTA_A_2551484_F0003_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/9732fd1b5f50/TSTA_A_2551484_F0004_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/6d386010166f/TSTA_A_2551484_UF0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/60f4a8ac878f/TSTA_A_2551484_F0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/be63b8f8ae6d/TSTA_A_2551484_F0002_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/5bd0d9d75d48/TSTA_A_2551484_F0003_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/599f/12409894/9732fd1b5f50/TSTA_A_2551484_F0004_OC.jpg

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