Recent advances in chemical and magnetic imaging of surfaces and interfaces by XPEEM

Locatelli, Andrea; Bauer, E.

doi:10.1088/0953-8984/20/9/093002

Cited by 143 publications

(114 citation statements)

References 160 publications

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“…The capability to perform laterallyresolved electron backscattering (Low-Energy Electron ISSN 1348-0391 c ⃝ 2015 The Surface Science Society of Japan (http://www.sssj.org/ejssnt)Microscopy, LEEM) [8,9] and x-ray photoemission (Xray PhotoEmission Electron Microscopy, XPEEM) [10] measurements provides a complete structural and chemical map of a given surface area with high spatial resolution of about 10 nm in LEEM and 30 nm in XPEEM. In addition, by imaging the back-focal plane, Low-Energy Electron Diffraction (LEED) data can be collected from micron-sized regions.…”

Section: Methodsmentioning

confidence: 99%

Phase Coexistence in Two-Dimensional Fe0.70Ni0.30 Films on W(110)

Menteş

Sala

Locatelli

et al. 2015

e-J. Surf. Sci. Nanotech.

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Using low energy electron microscopy, diffraction and x-ray photoemission electron microscopy, we study the phase separation in an Fe-Ni alloy film on W(110) at around 30 at.%Ni and at monolayer thickness. At high temperature, the monolayer-thick alloy is shown to transform into a biphase with submicron regions of different surface density exhibiting (1 × 1) and (1 × 8) structures. The former is pseudomorphic to the bcc substrate, whereas the latter is a slightly-distorted hexagonal adlayer lattice reminiscent of an fcc(111) monolayer. The stoichiometries of the two monolayer phases are Fe0.85Ni0.15 and Fe0.58Ni0.42 in laterally resolved x-ray photoemission microscopy measurements, with the bcc phase rich in Fe compared to the fcc one. This heterogeneous surface can be viewed as the two-dimensional limit of the bcc-fcc phase separation observed in thick films and in bulk Fe-Ni near the same composition. The length scale associated with the lateral heterogeneity in the monolayer film is much larger than the one observed in bulk alloys, suggesting that surface transport is the key mechanism in the kinetics of the phase separation process.

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Section: Methodsmentioning

confidence: 99%

Phase Coexistence in Two-Dimensional Fe0.70Ni0.30 Films on W(110)

Menteş

Sala

Locatelli

et al. 2015

e-J. Surf. Sci. Nanotech.

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“…Finally, another important aspect of the application of LEEM and PEEM is the possibility of performing ultra-fast measurements to follow structural processes or reactions at much shorter time scale (sub nanosecond regime), with the potential capability of identifying reactions intermediates and allowing correlations with the surface structure [73]. The approach of time-resolved measurements with high time resolution in the picosecond range with PEEM has been already reported for the study of magnetic properties of certain materials [74,75] and, more recently, for the study of plasmon propagation on metallic surfaces [76].…”

Section: Future Perspectivesmentioning

confidence: 99%

LEEM and PEEM as Probing Tools to Address Questions in Catalysis

Prieto

Schmidt

2017

Catal Lett

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Catalysis is a hot topic in research with the focus on finding catalysts that show better activity or selectivity on processes on technological or industrial interest. The use of model systems of applicable materials has proven to be a successful approach in the last decades to obtain information on the fundamental properties of these materials, leading eventually to a better understanding how real catalysts work. This knowledge is extremely important in the sense that it allows an optimization of the catalyst composition, thus leading to a rational design of new materials. For these fundamental studies, a variety of probing techniques such as X-ray photo-electron spectroscopy, scanning tunnel microscopy, and temperature programmed desorption have been applied. In this article, we discuss how low energy electron microscopy (LEEM) and photoemission electron microscopy (PEEM) can contribute to the fundamental understanding of relevant surface processes taking place on model catalysts. Also, the capability of these techniques on addressing open questions in catalysis is discussed

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“…In this subsection we do not want to fully discuss PEEM spectro-microscopy, we will focus only on that part of the PEEM applications which deal with magnetic microscopy, based on the XMCD and XLMD effects, which are the main subject of this article. More information one can nd in the literature [16,51]. This microscopy mode is based on absorption spectroscopy with spatial resolution, in which we detect the secondary electrons as a function of photon energy.…”

Section: Dilute Magnetic Semiconductorsmentioning

confidence: 99%

Element Specific Magnetometry Combining X-ray Circular with Linear Dichroism: Fundamentals and Applications

Kowalik

2015

Acta Phys. Pol. A

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This article gives an overview of the use of X-ray absorption spectroscopy to characterize the magnetic properties for technologically important, low dimensional magnetic materials. An overview is given both for the experimental hardware, the measurements and the analysis of the spectra. The information obtained is discussed for metallic and semiconducting systems, using both the X-ray magnetic circular dichroism and the X-ray linear magnetic dichroism spectroscopy. DOI: 10.12693/APhysPolA.127.831 PACS: 78.70.Dm, 78.20.Ls, 75.50.Pp, 75.50.Tt Short historic overview of the XMCD techniqueTo start this historical outline one should mention that although the X-ray magnetic circular dichroism (XMCD) technique is relatively young, the magneto-optical eect characteristic of the interaction between light and a magnetic medium was studied already in the nineteenth century, when several key discoveries were made enabling the development of new experimental techniques and thus studying so far unknown properties of matter. Let's start with Augustin Fresnel, who was the rst one to envision the existence of circular and elliptical light polarization.In his equations on light waves he described how light polarized in circular or elliptical states can be produced At about the same time, in 1895, investigating the phenomenon of cathode rays Roentgen discovered invisible, high-energy radiation in the spectral range from ultraviolet to gamma rays. This discovery initiated research on the physical properties of X-ray radiation and its interaction with matter. Despite the fact that the discovery of X-rays was made after the discovery of magneto-optical eects, it took still several decades for magneto-optics experiments based on X-rays.The rst theoretical predictions of a strong magnetic circular dichroism eect has been made in 1975 by E.A.(831)

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Recent advances in chemical and magnetic imaging of surfaces and interfaces by XPEEM

Cited by 143 publications

References 160 publications

Phase Coexistence in Two-Dimensional Fe<sub>0</sub><i><sub>.</sub></i><sub>70</sub>Ni<sub>0</sub><i><sub>.</sub></i><sub>30 </sub>Films on W(110)

Phase Coexistence in Two-Dimensional Fe<sub>0</sub><i><sub>.</sub></i><sub>70</sub>Ni<sub>0</sub><i><sub>.</sub></i><sub>30 </sub>Films on W(110)

LEEM and PEEM as Probing Tools to Address Questions in Catalysis

Element Specific Magnetometry Combining X-ray Circular with Linear Dichroism: Fundamentals and Applications

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