The structural modification and magnetism of many-layer epitaxial graphene implanted with low-energy light ions

Mazza, Alessandro R.; Miettinen, Anna; Gai, Zheng; He, Xiaoqing; Charlton, Timothy; Ward, Thomas Z.; Conrad, Matthew; Bian, Guang; Conrad, E. H.; Miceli, P. F.

doi:10.1016/j.carbon.2022.02.046

Cited by 3 publications

(2 citation statements)

References 60 publications

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“…The light atom (He) irradiation tolerance of a similar high entropy carbide, (ZrTiNbTaW) 0.2 C, was also studied through implantation with 540 keV ions up to a dose of 10 17 ions cm −3 [80]. The effect of He irradiation at both high and low energies is imperative to understand the potential for use in advanced nuclear reactors [81,82]. At this high fluence, the HEC was observed to maintain crystallinity after irradiation and from temperatures ranging from 25 • C-1500 • C. The peak lattice expansion observed (0.78%) was less than the binary ZrC (0.91%) and the HEC exhibited superior recovery (∼0.1% residual expansion after annealing) as compared to ZrC (0.2%).…”

Section: High Entropy Carbidesmentioning

confidence: 99%

High entropy ceramics for applications in extreme environments

Ward,

Wilkerson,

Musicó

et al. 2024

J. Phys. Mater.

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Compositionally complex materials have demonstrated extraordinary promise for structural robustness in extreme environments. Of these, the most commonly thought of are high entropy alloys, where chemical complexity grants uncommon combinations of hardness, ductility, and thermal resilience. In contrast to these metal-metal bonded systems, the addition of ionic and covalent bonding has led to the discovery of high entropy ceramics. These materials also possess outstanding structural, thermal, and chemical robustness but with a far greater variety of functional properties which enable access to continuously controllable magnetic, electronic, and optical phenomena. In this experimentally focused perspective, we outline the potential for high entropy ceramics in functional applications under extreme environments, where intrinsic stability may provide a new path toward inherently hardened device design. Current works on high entropy carbides, actinide bearing ceramics, and high entropy oxides are reviewed in the areas of radiation, high temperature, and corrosion tolerance where the role of local disorder is shown to create pathways toward self-healing and structural robustness. In this context, new strategies for creating future electronic, magnetic, and optical devices to be operated in harsh environments are outlined.

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Section: High Entropy Carbidesmentioning

confidence: 99%

High entropy ceramics for applications in extreme environments

Ward,

Wilkerson,

Musicó

et al. 2024

J. Phys. Mater.

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“…To understand how strain can be used to induce magnetism in PdCoO 2 , first-principles calculations were performed as a function of distortion to the unit cell (Supporting Information, Section I). As previous reports have shown, helium implantation can be used to generate an out-of-plane expansion of the lattice while the in-plane lattice remains heteroepitaxially locked and unchanged, − so calculations were performed by applying an out-of-plane expansion to the unit cell. Because PdCoO 2 shows itinerate and localized physics, density functional theory + U calculations informed by quantum Monte Carlo (QMC) , were performed to minimize ambiguities in the choice of the U parameter …”

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confidence: 99%

Emergent Magnetism with Continuous Control in the Ultrahigh-Conductivity Layered Oxide PdCoO₂

Brahlek,

Mazza,

Annaberdiyev

et al. 2023

Nano Lett.

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The current challenge to realizing continuously tunable magnetism lies in our inability to systematically change properties, such as valence, spin, and orbital degrees of freedom, as well as crystallographic geometry. Here, we demonstrate that ferromagnetism can be externally turned on with the application of low-energy helium implantation and can be subsequently erased and returned to the pristine state via annealing. This high level of continuous control is made possible by targeting magnetic metastability in the ultrahigh-conductivity, nonmagnetic layered oxide PdCoO 2 where local lattice distortions generated by helium implantation induce the emergence of a net moment on the surrounding transition metal octahedral sites. These highly localized moments communicate through the itinerant metal states, which trigger the onset of percolated long-range ferromagnetism. The ability to continuously tune competing interactions enables tailoring precise magnetic and magnetotransport responses in an ultrahigh-conductivity film and will be critical to applications across spintronics.

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Disorder and hydrogenation in graphene nanopowder revealed by complementary X-ray and neutron scattering

Daykin

Ravula

Kaiser

et al. 2023

Carbon

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The structural modification and magnetism of many-layer epitaxial graphene implanted with low-energy light ions

Cited by 3 publications

References 60 publications

High entropy ceramics for applications in extreme environments

High entropy ceramics for applications in extreme environments

Emergent Magnetism with Continuous Control in the Ultrahigh-Conductivity Layered Oxide PdCoO₂

Disorder and hydrogenation in graphene nanopowder revealed by complementary X-ray and neutron scattering

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The structural modification and magnetism of many-layer epitaxial graphene implanted with low-energy light ions

Cited by 3 publications

References 60 publications

High entropy ceramics for applications in extreme environments

High entropy ceramics for applications in extreme environments

Emergent Magnetism with Continuous Control in the Ultrahigh-Conductivity Layered Oxide PdCoO2

Disorder and hydrogenation in graphene nanopowder revealed by complementary X-ray and neutron scattering

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Product

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Emergent Magnetism with Continuous Control in the Ultrahigh-Conductivity Layered Oxide PdCoO₂