Chemical and Magnetic Imaging with X-Ray Photoemission Electron Microscopy

Locatelli, Andrea; Menteş, Tevfik Onur

doi:10.1007/978-3-642-55315-8_21

Cited by 4 publications

(7 citation statements)

References 92 publications

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“…Our substrate, Ir(100), offers the advantage of tunable film–substrate interaction, favoring diffusion of intercalated atoms at temperatures higher than 500 °C, when the film completely decouples from the substrate; , similar to Ru(0001) and Ir(111), , it also warrants that the intercalated atoms are sealed under graphene, due to substrate chemisorption of the graphene’s island edges. Combined use of low energy electron microscopy (LEEM) and synchrotron-based photoemission electron microscopy (XPEEM) gave us access to the interface structure and composition. Thanks to high sensitivity to near-surface species, XPEEM allowed mapping the lateral distribution of intercalated Ar and its evolution upon annealing.…”

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confidence: 99%

Nanobubbles at GPa Pressure under Graphene

et al. 2015

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We provide direct evidence that irradiation of a graphene membrane on Ir with low-energy Ar ions induces formation of solid noble-gas nanobubbles. Their size can be controlled by thermal treatment, reaching tens of nanometers laterally and height of 1.5 nm upon annealing at 1080 °C. Ab initio calculations show that Ar nanobubbles are subject to pressures reaching tens of GPa, their formation being driven by minimization of the energy cost of film distortion and loss of adhesion.

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Nanobubbles at GPa Pressure under Graphene

et al. 2015

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“…Similarly the second bracket of Eq. (10), which depends on ðΘ 0 Δf Þ 2 , can be neglected when Eq. ( 11) is satisfied.…”

Section: Resultsmentioning

confidence: 99%

“…We detail an alternative method to remove the contrast due to in-plane magnetization and the electrostatic potential in Eq. (10), for example when it is not possible to satisfy Eq. (11).…”

Section: Resultsmentioning

confidence: 99%

“…Currently, most microscopy methodologies are limited to imaging in two dimensions, leaving some components of the magnetic field invisible. In the case of surface-sensitive techniques such as magneto-optical Kerr microscopy, atomic force microscopy, and X-ray photoemission electron microscopy, the magnetization inside the sample is inaccessible [8][9][10] . Transmission electron microscopy (TEM) remains the highest spatial resolution technique that can be used to reconstruct the components of the magnetic induction within and around a sample 11,12 .…”

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confidence: 99%

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3D magnetic imaging using electron vortex beam microscopy

2022

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Electron vortex beams are free-electron waves that carry orbital angular momentum. There has been growing theoretical and experimental interest in the use of electron vortex beams as a tool for the investigation of magnetic materials. However, due to the complex wavefront of the propagating waves, a deeper understanding of the interaction of electron vortex beams and the magnetic sample is needed. Here we calculate the magnetic phase shift that an electron vortex beam obtains upon transmitting through a magnetic sample. We show that this magnetic phase shift is influenced by the out-of-plane magnetization, which is a unique characteristic of incident electron vortex beams and is proportional to their orbital angular momentum. Finally, we develop a phase retrieval methodology to retrieve the out-of-plane component of magnetization. Based on our theory, we discuss suitable experimental conditions that would enable this imaging capability for magnetic materials and further extend to non-magnetic chiral materials.

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“…1(a) and 1(b)), the Ru(0001) -NSA surfaces contain randomly distributed nanosized protrusions with height of 2 to 6 Å which are ascribed to the formation of near-surface Ar nanobubbles (Figs. 1(c) and 1(d)) [32]. Local XAS characterization from synchrotron-based XPEEM can provide direct evidence on the protrusions' composition, with a spatial resolution of 20 nm [33].…”

Section: Transition From Anisotropic To Isotropic Growth Of Graphene On Ru(0001) By Dosing Near-surface Ar Nanobubblesmentioning

confidence: 99%

Growth, coalescence, and etching of two-dimensional overlayers on metals modulated by near-surface Ar nanobubbles

et al. 2021

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The synthesis of high-quality ultrathin overlayers is critically dependent on the surface structure of substrates, especially involving the overlayer-substrate interaction. By using in situ surface measurements, we demonstrate that the overlayer-substrate interaction can be tuned by doping near-surface Ar nanobubbles. The interfacial coupling strength significantly decreases with near-surface Ar nanobubbles, accompanying by an “anisotropic to isotropic” growth transformation. On the substrate containing near-surface Ar, the growth front crosses entire surface atomic steps in both uphill and downhill directions with no difference, and thus, the morphology of the two-dimensional (2D) overlayer exhibits a round-shape. Especially, the round-shaped 2D overlayers coalesce seamlessly with a growth acceleration in the approaching direction, which is barely observed in the synthesis of 2D materials. This can be attributed to the immigration lifetime and diffusion rate of growth species, which depends on the overlayer-substrate interaction and the surface catalysis. Furthermore, the “round to hexagon” morphological transition is achieved by etching-regrowth, revealing the inherent growth kinetics under quasi-freestanding conditions. These findings provide a novel promising way to modulate the growth, coalescence, and etching dynamics of 2D materials on solid surfaces by adjusting the strength of overlayer-substrate interaction, which contributes to optimization of large-scale production of 2D material crystals.

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Chemical and Magnetic Imaging with X-Ray Photoemission Electron Microscopy

Cited by 4 publications

References 92 publications

Nanobubbles at GPa Pressure under Graphene

Nanobubbles at GPa Pressure under Graphene

3D magnetic imaging using electron vortex beam microscopy

Growth, coalescence, and etching of two-dimensional overlayers on metals modulated by near-surface Ar nanobubbles

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