نتایج جستجو برای: spectromicroscopy

تعداد نتایج: 304  

Journal: :Ultramicroscopy 2017
Daniel M Gottlob Eugénie Martinez Claire Mathieu Christophe Lubin Nicolas Chevalier Munique Kazar Mendes Christelle Charpin Eric Jalaguier Olivier Renault Nicholas Barrett

HfO2-based resistive oxide memories are studied by core-level spectromicroscopy using a laboratory-based X-ray photoelectron emission microscope (XPEEM). After forming, the top electrode is thinned to about 1 nm for the XPEEM analysis, making the buried electrode/HfO2 interface accessible whilst preserving it from contamination. The results are obtained in the true photoemission channel mode fr...

Journal: :Journal of synchrotron radiation 2014
Adam P Hitchcock Michael F Toney

Current and future capabilities of X-ray spectromicroscopy are discussed based on coherence-limited imaging methods which will benefit from the dramatic increase in brightness expected from a diffraction-limited storage ring (DLSR). The methods discussed include advanced coherent diffraction techniques and nanoprobe-based real-space imaging using Fresnel zone plates or other diffractive optics ...

2015
Christoph Baeumer Christoph Schmitz Amr H. H. Ramadan Hongchu Du Katharina Skaja Vitaliy Feyer Philipp Müller Benedikt Arndt Chun-Lin Jia Joachim Mayer Roger A. De Souza Claus Michael Schneider Rainer Waser Regina Dittmann

The demand for highly scalable, low-power devices for data storage and logic operations is strongly stimulating research into resistive switching as a novel concept for future non-volatile memory devices. To meet technological requirements, it is imperative to have a set of material design rules based on fundamental material physics, but deriving such rules is proving challenging. Here, we eluc...

2014
Hirokazu Fukidome Masato Kotsugi Kosuke Nagashio Ryo Sato Takuo Ohkochi Takashi Itoh Akira Toriumi Maki Suemitsu Toyohiko Kinoshita

Graphene, a 2D crystal bonded by π and σ orbitals, possesses excellent electronic properties that are promising for next-generation optoelectronic device applications. For these a precise understanding of quasiparticle behaviour near the Dirac point (DP) is indispensable because the vanishing density of states (DOS) near the DP enhances many-body effects, such as excitonic effects and the Ander...

Journal: :The Analyst 2010
Merrill Isenor Susan G W Kaminskyj Russell J Rodriguez Regina S Redman Kathleen M Gough

FTIR and Raman spectromicroscopy were used to characterize the composition of Curvularia protuberata hyphae, and to compare a strain isolated from plants inhabiting geothermal soils with a non-geothermal isolate. Thermal IR source images of hyphae have been acquired with a 64 × 64 element focal plane array detector; single point IR spectra have been obtained with synchrotron source light. In so...

Journal: :Cell metabolism 2014
Shuhua Yue Junjie Li Seung-Young Lee Hyeon Jeong Lee Tian Shao Bing Song Liang Cheng Timothy A Masterson Xiaoqi Liu Timothy L Ratliff Ji-Xin Cheng

Altered lipid metabolism is increasingly recognized as a signature of cancer cells. Enabled by label-free Raman spectromicroscopy, we performed quantitative analysis of lipogenesis at single-cell level in human patient cancerous tissues. Our imaging data revealed an unexpected, aberrant accumulation of esterified cholesterol in lipid droplets of high-grade prostate cancer and metastases. Bioche...

Journal: :Physical review letters 2015
R Kukreja S Bonetti Z Chen D Backes Y Acremann J A Katine A D Kent H A Dürr H Ohldag J Stöhr

We have used a MHz lock-in x-ray spectromicroscopy technique to directly detect changes in magnetic moment of Cu due to spin injection from an adjacent Co layer. The elemental and chemical specificity of x rays allows us to distinguish two spin current induced effects. We detect the creation of transient magnetic moments of 3×10^{-5}μ_{B} on Cu atoms within the bulk of the 28 nm thick Cu film d...

2016

The spherical mirror analyser (SMA) is used to acquire fast XPS images from specimen surfaces with high lateral and energy resolution. Here we review the properties of the SMA including spatial and energy resolution and provide examples of the capabilities of such an imaging analyser. In the last few years the combination of the SMA with a two-dimensional, pulse counting electron detector has a...

2003
Bradley H. Frazer Benjamin Gilbert Brandon R. Sonderegger Gelsomina De Stasio

X-ray absorption spectra can be collected in multiple ways, each exhibiting a different probing depth. The total electron yield signal contains contributions from primary, Auger and secondary electrons. We present data on the total electron yield probing depth at core level energies ranging from 77 to 929 eV. By coating materials with chromium overlayers, we find that the maximum probing depth ...

2016
Christoph Baeumer Christoph Schmitz Astrid Marchewka David N Mueller Richard Valenta Johanna Hackl Nicolas Raab Steven P Rogers M Imtiaz Khan Slavomir Nemsak Moonsub Shim Stephan Menzel Claus Michael Schneider Rainer Waser Regina Dittmann

The continuing revolutionary success of mobile computing and smart devices calls for the development of novel, cost- and energy-efficient memories. Resistive switching is attractive because of, inter alia, increased switching speed and device density. On electrical stimulus, complex nanoscale redox processes are suspected to induce a resistance change in memristive devices. Quantitative informa...

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