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Title: Studies of magnetic microstructures with soft x-ray transmissionmicroscopy


No abstract prepared.

Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. Basic EnergySciences
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0018-9197; IEJQA7; R&D Project: 509201; BnR: KC0202030; TRN: US200803%%455
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Journal of Quantum Electronics; Journal Volume: 42; Journal Issue: 1; Related Information: Journal Publication Date: 01/2006
Country of Publication:
United States

Citation Formats

Fischer, Peter. Studies of magnetic microstructures with soft x-ray transmissionmicroscopy. United States: N. p., 2006. Web. doi:10.1109/JQE.2005.851556.
Fischer, Peter. Studies of magnetic microstructures with soft x-ray transmissionmicroscopy. United States. doi:10.1109/JQE.2005.851556.
Fischer, Peter. Sun . "Studies of magnetic microstructures with soft x-ray transmissionmicroscopy". United States. doi:10.1109/JQE.2005.851556.
title = {Studies of magnetic microstructures with soft x-ray transmissionmicroscopy},
author = {Fischer, Peter},
abstractNote = {No abstract prepared.},
doi = {10.1109/JQE.2005.851556},
journal = {IEEE Journal of Quantum Electronics},
number = 1,
volume = 42,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
  • A hard/soft SmCo{sub 5}/Fe nanocomposite magnetic bilayer system has been fabricated on X-ray transparent 100-200 nm thin Si{sub 3}N{sub 4} membranes by magnetron sputtering. The microscopic magnetic domain pattern and its behavior during magnetization reversal in the hard and soft magnetic phases have been individually studied by element specific magnetic soft x-ray microscopy at a spatial resolution of better than 25nm. We observe that the domain patterns for soft and hard phases switch coherently throughout the full hysteresis cycle upon applying external magnetic fields. We derived local M(H) curves from the images for Fe and SmCo5 separately and found switchingmore » for both hard and soft phases same.« less
  • With the recent advances in layered synthetic microstructure (LSM) technology, it is now possible to build a simple, high-throughput, near-normal incidence soft x-ray spectrometer as a diagnostic for magnetically confined plasmas. Such spectrometers could be used for radiative power loss measurements from intrinsic impurities, an impurity concentration monitor, or ion temperature measurements from Doppler broadening of high charge-state metallic impurities. LSMs have been developed as either flat or curved multilayer mirrors (MLMs) or as coatings for conventional gratings. Flat multilayer mirrors can have near-normal incidence reflectivities greater than 50% throughout the entire soft x-ray region with bandpasses that can bemore » less than 4 A. Coated gratings are being developed that will combine the high soft x-ray reflectivity of the LSM with the high resolution of the grating. Specific applications of LSMs as dispersive elements will be discussed. As an example, LSM-based low-resolution spectra of both a laboratory and tokamak plasma will be presented.« less
  • The structural evolution of Co{sub 40}Fe{sub 22}Ta{sub 8}B{sub 30} glassy particles has been studied by in-situ high-energy synchrotron X-ray diffraction (XRD) upon isochronal annealing. The changes in position, intensity, and full width at half maximum (FWHM) of the first and second diffuse maxima of the XRD patterns suggest the occurrence of irreversible structural relaxation upon the first heating up to a temperature close to the glass transition temperature T{sub g}. The variations in reduced pair correlation functions upon annealing are discussed in the frame of the topological fluctuation theory for structural relaxation. Isochronal annealing of the Co{sub 40}Fe{sub 22}Ta{sub 8}B{submore » 30} glassy particles improves their soft magnetic properties through decreasing the coercivity and increasing the magnetic susceptibility, saturation magnetization, and Curie temperature.« less
  • 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
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