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Title: Soft X-ray spectromicroscopy and ptychography

Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
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Grant/Contract Number:
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Electron Spectroscopy and Related Phenomena
Additional Journal Information:
Journal Volume: 200; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-03 21:57:09; Journal ID: ISSN 0368-2048
Country of Publication:

Citation Formats

Hitchcock, Adam P. Soft X-ray spectromicroscopy and ptychography. Netherlands: N. p., 2015. Web. doi:10.1016/j.elspec.2015.05.013.
Hitchcock, Adam P. Soft X-ray spectromicroscopy and ptychography. Netherlands. doi:10.1016/j.elspec.2015.05.013.
Hitchcock, Adam P. 2015. "Soft X-ray spectromicroscopy and ptychography". Netherlands. doi:10.1016/j.elspec.2015.05.013.
title = {Soft X-ray spectromicroscopy and ptychography},
author = {Hitchcock, Adam P.},
abstractNote = {},
doi = {10.1016/j.elspec.2015.05.013},
journal = {Journal of Electron Spectroscopy and Related Phenomena},
number = C,
volume = 200,
place = {Netherlands},
year = 2015,
month = 4

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.elspec.2015.05.013

Citation Metrics:
Cited by: 8works
Citation information provided by
Web of Science

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  • High spatial resolution magnetic x-ray spectromicroscopy at x-ray photon energies near the cobalt L{sub 3} resonance was applied to probe an amorphous 50 nm thin SmCo{sub 5} film prepared by off-axis pulsed laser deposition onto an x-ray transparent 200 nm thin Si{sub 3}N{sub 4} membrane. Alternating gradient magnetometry shows a strong in-plane anisotropy and an only weak perpendicular magnetic anisotropy, which is confirmed by magnetic transmission soft x-ray microscopy images showing over a field of view of 10 μm a primarily stripe-like domain pattern but with local labyrinth-like domains. Soft x-ray ptychography in amplitude and phase contrast was used to identify and characterizemore » local magnetic and structural features over a field of view of 1 μm with a spatial resolution of about 10 nm. There, the magnetic labyrinth domain patterns are accompanied by nanoscale structural inclusions that are primarily located in close proximity to the magnetic domain walls. Our analysis suggests that these inclusions are nanocrystalline Sm{sub 2}Co{sub 17} phases with nominally in-plane magnetic anisotropy.« less
  • Cited by 11
  • Understanding Fe deposition in fluid catalytic cracking (FCC) catalysis is critical for the mitigation of catalyst degradation. We employ soft X-ray ptychography to determine at the nanoscale the distribution and chemical state of Fe in an aged FCC catalyst particle. We also show that both particle swelling due to colloidal Fe deposition and Fe penetration into the matrix as a result of precracking of large organic molecules occur. Furthermore, the application of ptychography allowed us to provide direct visual evidence for these two distinct Fe-based deactivation mechanisms, which have so far been proposed only on the basis of indirect evidence.
    Cited by 10
  • Characterizing the chemistry and magnetism of magnetotactic bacteria (MTB) is an important aspect of understanding the biomineralization mechanism and function of the chains of magnetosomes (Fe 3O 4 nanoparticles) found in such species. Images and X-ray absorption spectra (XAS) of magnetosomes extracted from, and magnetosomes in, whole Magnetovibrio blakemorei strain MV-1 cells have been recorded using soft X-ray ptychography at the Fe 2p edge. A spatial resolution of 7 nm is demonstrated. Precursor-like and immature magnetosome phases in a whole MV-1 cell were visualized, and their Fe 2p spectra were measured. Based on these results, a model for the pathwaymore » of magnetosome biomineralization for MV-1 is proposed. Fe 2p X-ray magnetic circular dichroism (XMCD) spectra have been derived from ptychography image sequences recorded using left and right circular polarization. The shape of the XAS and XMCD signals in the ptychographic absorption spectra of both sample types is identical to the shape and signals measured with conventional bright-field scanning transmission X-ray microscope. A weaker and inverted XMCD signal was observed in the ptychographic phase spectra of the extracted magnetosomes. The XMCD ptychographic phase spectrum of the intracellular magnetosomes differed from the ptychographic phase spectrum of the extracted magnetosomes. Lastly, these results demonstrate that spectro-ptychography offers a superior means of characterizing the chemical and magnetic properties of MTB at the individual magnetosome level.« less
    Cited by 3