Emerging 2D magnetic states in a graphene-based monolayer of EuC6

被引:15
作者
Sokolov, Ivan S. [1 ]
Averyanov, Dmitry V. [1 ]
Wilhelm, Fabrice [2 ]
Rogalev, Andrei [2 ]
Parfenov, Oleg E. [1 ]
Taldenkov, Alexander N. [1 ]
Karateev, Igor A. [1 ]
Tokmachev, Andrey M. [1 ]
Storchak, Vyacheslav G. [1 ]
机构
[1] Natl Res Ctr Kurchatov Inst, Kurchatov Sq 1, Moscow 123182, Russia
[2] ESRF European Synchrotron, CS 40220, F-38043 Grenoble 9, France
基金
俄罗斯基础研究基金会; 俄罗斯科学基金会;
关键词
two-dimensional (2D) ferromagnetism; graphene; EuC6; X-ray magnetic circular dichroism (XMCD); monolayer; EPITAXIAL GRAPHENE; FERROMAGNETISM; FIELD;
D O I
10.1007/s12274-021-3494-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Recent discoveries of intrinsic two-dimensional (2D) magnets open up vast opportunities to address fundamental problems in condensed matter physics, giving rise to applications from ultra-compact spintronics to quantum computing. The ever-growing material landscape of 2D magnets lacks, however, carbon-based systems, prominent in other areas of 2D research. Magnetization measurements of the Eu/graphene compound a monolayer of the EuC6-stoichiometry-reveal the emergence of 2D ferromagnetism but detailed studies of competing magnetic states are still missing. Here, we employ element-selective X-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) to establish the magnetic structure of monolayer EuC6. The system exhibits the anomalous Hall effect, negative magnetoresistance, and magnetization consistent with a ferromagnetic state but the saturation magnetic moment (about 2.5 mu B/Eu) is way too low for the half-filled f-shells of Eu2+ ions. Combined XAS/XMCD studies at the Eu L-3 absorption edge probe the EuC6 magnetism in high fields and reveal the nature of the missing magnetic moments. The results are set against XMCD studies in Eu/silicene and Eu/germanene to establish monolayer EuC6 as a prominent member of the family of Eu-based 2D magnets combining the celebrated graphene properties with a strong magnetism of europium.
引用
收藏
页码:408 / 413
页数:6
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