Magnetic high-resolution spectroscopy with Beamline 4.0.1-2: an elliptically polarizing undulator beamline at the Advanced Light Source

Young, A. T.; Мартынов, В. В.; Padmore, Howard

doi:10.1016/s0368-2048(98)00409-5

Cited by 22 publications

(21 citation statements)

References 10 publications

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“…A slightly increased oxygen concentration cannot be excluded. The XMCD measurements were performed at beamline 4.0.2 at the Advanced Light Source in Berkeley, California [20,21], using the eight-pole electromagnet. The experiments were performed within a temperature range of 80-300 K and an external magnetic field of 0.7 T, which was aligned along the c-axis of the crystals.…”

Section: Experimental and Theoretical Detailsmentioning

confidence: 99%

The x-ray magnetic circular dichroism spin sum rule for 3d⁴systems: Mn³⁺ions in colossal magnetoresistance manganites

Kuepper

Raekers

Taubitz

et al. 2012

J. Phys.: Condens. Matter

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The colossal magnetoresistance manganites La(0.87±0.02)Sr(0.12±0.02)MnO(3+δ), La(0.78±0.02)Sr(0.17±0.02)MnO(3+δ), and La(0.66±0.02)Sr(0.36±0.02)MnO(3+δ) (δ close to 0) were investigated by using soft x-ray magnetic circular dichroism (XMCD) and magnetometry. Very good agreement between the values for the average Mn magnetic moments determined with these two methods was achieved by correcting the XMCD spin sum rule results by means of charge transfer multiplet calculations, which also suggest a charge transfer of ~50% for Mn(4+) and approximately equal to 30% for Mn(3+). The magnetic moment was found to be localized at the Mn ions for x = 0.17 and 0.36 at 80 K and for x = 0.12 in the temperature range from 80 to 300 K. We discuss our findings in the light of previously published data, confirming the validity of our approach.

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Section: Experimental and Theoretical Detailsmentioning

confidence: 99%

The x-ray magnetic circular dichroism spin sum rule for 3d⁴systems: Mn³⁺ions in colossal magnetoresistance manganites

Kuepper

Raekers

Taubitz

et al. 2012

J. Phys.: Condens. Matter

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“…The samples were measured in vacuum at 4 K using a 6 T superconducting magnet, in order to magnetize the paramagnetic centres. The resolution of the monochromator is better than 0.2 eV and for the fluorescence measurements a Canberra 30-element Ge detector was used [9,10].…”

Section: X-mcd Experimentsmentioning

confidence: 99%

New frontiers in X-ray spectroscopy in heterogeneous catalysis: Using Fe/ZSM-5 as test-system

et al. 2005

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We have applied a number of novel X-ray spectroscopic tools to Fe/ZSM-5 systems. Fe/ZSM-5 can be considered as an ideal test-system for the characterization techniques in heterogeneous catalysis. The existence of a large range of sites and structures creates a good testing ground to determine which experimental tools are able to resolve such complex system. In situ soft X-ray absorption provides important information on the valence and electronic structure of iron during treatments, with a time scale down to 30 s. Kb-detected XANES yields unprecedented resolution for pre-edge structures and using hard X-rays can be used under any condition and treatment, including high-pressures. It can be expected that both in situ soft X-ray absorption and Kb-detected XANES become 'standard' tools for catalysis research, similar to traditional XANES and EXAFS today. The X-MCD is also used in this paper but it will probably remain a rather specialized technique in the field of heterogeneous catalysis. Further new developments for catalysis characterization are for all to be expected from X-ray spectro-microscopy, where one will have the possibility to perform the in situ soft X-ray absorption and Kb-detected XANES experiments with nanometer size spatial resolution. #

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“…1(a)) by subjecting it to an external field of about 500 Oe. The radiation polarization could be varied from linear polarized (LP) to right or left circular polarized (RCP or LCP) via the undulator involved 21 .…”

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confidence: 99%

Probing buried interfaces with soft x-ray standing wave spectroscopy: application to the Fe/Cr interface

Yang

Mun

Mannella

et al. 2002

J. Phys.: Condens. Matter

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Many current technological devices consist of layered or sandwich structures, the thickness of whose composite layers is either already in the nanometer (10 Å) range or in the process of shrinking into the nanometer range. These devices include transistors in integrated circuits, solid-state lasers, and magnetic elements for storing information and for reading it out. Such interfaces may exhibit intermixing of the components on either side and/or roughness, as well as altered chemical states or states of magnetic order, and their exact nature can affect ultimate properties such as electrical conductivity or magnetic stability in a profound way. As one example of such nanostructures in magnetism, the phenomenon of giant magnetoresistance (GMR) is based on the change in resistance in a sandwich structure consisting of alternating non-magnetic and magnetic layers upon being exposed to an external magnetic field 1,2 . GMR is today used routinely in the read heads for highest density information storage, where it is usually combined with another interface-driven effect, exchange Some of these questions can be answered at least partially using currently available methods, and we briefly mention a few of these. One powerful method is scanning transmission electron 2 microscopy (STEM) with electron energy loss spectroscopy (EELS) 5 , but this technique requires specialized sample slicing and thinning and thus cannot be considered non-destructive, and in its most sophisticated element-specific form with EELS still cannot provide both element specificity and magnetic sensitivity at the sub-nanometer scale. . Hard x-rays in the 5-10 keV can be reflected from buried interfaces and planar multilayer nanostructures so as to set up standing waves that may permit depth-dependent composition, structure, and, via variable light polarization or magnetization direction, also magnetism near buried interfaces to be derived 6,7 . But these hard x-ray measurements are limited as to both energy resolution and spectroscopic characterization, and also may due to their shorter wavelengths (∼1-2 Å) exhibit interference structures from atomic lattice planes that can be much smaller than the nanometer scale it is desired to probe. Another method uses total reflection of soft xrays in the 0.5-1.5 keV range from a buried interface by tuning the photon energy to a core-level absorption edge 8 , and this can determine both chemical and magnetic roughness by working with both right and left circularly polarized radiation (RCP and LCP, respectively) and/or flipping the sample magnetization between two orientations 1 and 2 and measuring a magnetic asymmetry in diffuseHowever, this method does not permit detailed spectroscopic studies (e.g. via photoelectron emission) of the buried interface. Finally, soft x-ray spectromicroscopy using secondary electrons as the detecting medium can achieve some sensitivity to buried interfaces, provided that there are sufficient chemical fingerprints in the x-ray absorption signal to deconvolve the interface contrib...

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Magnetic high-resolution spectroscopy with Beamline 4.0.1-2: an elliptically polarizing undulator beamline at the Advanced Light Source

Cited by 22 publications

References 10 publications

The x-ray magnetic circular dichroism spin sum rule for 3d⁴systems: Mn³⁺ions in colossal magnetoresistance manganites

The x-ray magnetic circular dichroism spin sum rule for 3d⁴systems: Mn³⁺ions in colossal magnetoresistance manganites

New frontiers in X-ray spectroscopy in heterogeneous catalysis: Using Fe/ZSM-5 as test-system

Probing buried interfaces with soft x-ray standing wave spectroscopy: application to the Fe/Cr interface

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Magnetic high-resolution spectroscopy with Beamline 4.0.1-2: an elliptically polarizing undulator beamline at the Advanced Light Source

Cited by 22 publications

References 10 publications

The x-ray magnetic circular dichroism spin sum rule for 3d4systems: Mn3+ions in colossal magnetoresistance manganites

The x-ray magnetic circular dichroism spin sum rule for 3d4systems: Mn3+ions in colossal magnetoresistance manganites

New frontiers in X-ray spectroscopy in heterogeneous catalysis: Using Fe/ZSM-5 as test-system

Probing buried interfaces with soft x-ray standing wave spectroscopy: application to the Fe/Cr interface

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The x-ray magnetic circular dichroism spin sum rule for 3d⁴systems: Mn³⁺ions in colossal magnetoresistance manganites

The x-ray magnetic circular dichroism spin sum rule for 3d⁴systems: Mn³⁺ions in colossal magnetoresistance manganites