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


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Article Info

DATE

2021-06-04

AUTHORS

Ivan S. Sokolov, Dmitry V. Averyanov, Fabrice Wilhelm, Andrei Rogalev, Oleg E. Parfenov, Alexander N. Taldenkov, Igor A. Karateev, Andrey M. Tokmachev, Vyacheslav G. Storchak

ABSTRACT

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 µB/Eu) is way too low for the half-filled f-shells of Eu2+ ions. Combined XAS/XMCD studies at the Eu L3 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. More... »

PAGES

408-413

References to SciGraph publications

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    23 schema:description 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 µB/Eu) is way too low for the half-filled f-shells of Eu2+ ions. Combined XAS/XMCD studies at the Eu L3 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.
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    30 schema:keywords Combined XAS/XMCD studies
    31 EU
    32 Eu L3 absorption edge
    33 Eu/germanene
    34 Eu/graphene compound
    35 Eu/silicene
    36 Eu2
    37 EuC6
    38 EuC6 magnetism
    39 Hall effect
    40 L3 absorption edge
    41 XAS/XMCD studies
    42 XMCD studies
    43 absorption edge
    44 absorption spectroscopy
    45 anomalous Hall effect
    46 applications
    47 area
    48 carbon-based systems
    49 celebrated graphene properties
    50 circular dichroism
    51 compounds
    52 computing
    53 detailed study
    54 dichroism
    55 discovery
    56 edge
    57 effect
    58 emergence
    59 europium
    60 family
    61 family of Eu
    62 ferromagnetic state
    63 ferromagnetism
    64 field
    65 fundamental problem
    66 germanene
    67 graphene compounds
    68 graphene properties
    69 graphene-based monolayer
    70 high fields
    71 ions
    72 lack
    73 landscape
    74 magnetic circular dichroism
    75 magnetic moment
    76 magnetic state
    77 magnetic structure
    78 magnetism
    79 magnetization
    80 magnetization measurements
    81 magnetoresistance
    82 magnets
    83 magnets lacks
    84 material landscape
    85 matter physics
    86 measurements
    87 members
    88 moment
    89 monolayer EuC6
    90 monolayers
    91 nature
    92 negative magnetoresistance
    93 opportunities
    94 physics
    95 problem
    96 prominent member
    97 properties
    98 ray absorption spectroscopy
    99 recent discovery
    100 research
    101 results
    102 rise
    103 saturation magnetic moment
    104 shell
    105 shells of Eu2
    106 silicene
    107 spectroscopy
    108 spintronics
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    110 strong magnetism
    111 structure
    112 study
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    117 schema:name Emerging 2D magnetic states in a graphene-based monolayer of EuC6
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