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51 results

Page 1 of 3

  • Lorentz Transmission Electron Microscopy Image Simulations of Experimental Nano-Chessboard Observations in Co-Pt Alloys
  • Isha Kashyap, Yongmei M. Jin, Eric P. Vetter, Jerrold A. Floro, Marc De Graef
  • Journal: Microscopy and Microanalysis / Volume 24 / Issue 3 / June 2018
  • Published online by Cambridge University Press: 01 June 2018, pp. 221-226
  • Print publication: June 2018
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    The magnetization configuration of a novel nano-chessboard structure consisting of L10 and L12 phases in a Co40Pt60 alloy is investigated using Lorentz transmission electron microscopy (LTEM) and micro-magnetic simulations. We show high-resolution LTEM images of nano-size magnetic features acquired through spherical aberration correction in Lorentz Fresnel mode. Phase reconstructions and LTEM image simulations are carried out to fully understand the magnetic microstructure. The experimental Fresnel images of the nano-chessboard structure show zig-zag shaped magnetic domain walls at the inter-phase boundaries between L10 and L12 phases. A circular magnetization distribution with vortex and anti-vortex type arrangement is evident in the phase reconstructed magnetic induction maps as well as simulated maps. The magnetic contrast in experimental LTEM images is interpreted with the help of magnetic induction maps simulated for various relative electron beam-sample orientations inside the TEM.

  • Reconstruction of Laser-Induced Surface Topography from Electron Backscatter Diffraction Patterns
  • Patrick G. Callahan, McLean P. Echlin, Tresa M. Pollock, Marc De Graef
  • Journal: Microscopy and Microanalysis / Volume 23 / Issue 4 / August 2017
  • Published online by Cambridge University Press: 08 August 2017, pp. 730-740
  • Print publication: August 2017
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    We demonstrate that the surface topography of a sample can be reconstructed from electron backscatter diffraction (EBSD) patterns collected with a commercial EBSD system. This technique combines the location of the maximum background intensity with a correction from Monte Carlo simulations to determine the local surface normals at each point in an EBSD scan. A surface height map is then reconstructed from the local surface normals. In this study, a Ni sample was machined with a femtosecond laser, which causes the formation of a laser-induced periodic surface structure (LIPSS). The topography of the LIPSS was analyzed using atomic force microscopy (AFM) and reconstructions from EBSD patterns collected at 5 and 20 kV. The LIPSS consisted of a combination of low frequency waviness due to curtaining and high frequency ridges. The morphology of the reconstructed low frequency waviness and high frequency ridges matched the AFM data. The reconstruction technique does not require any modification to existing EBSD systems and so can be particularly useful for measuring topography and its evolution during in situ experiments.

  • Determination of Surface Topography from Laser Ablation using EBSD
  • P.G. Callahan, M.P. Echlin, T.M. Pollock, M. De Graef
  • Journal: Microscopy and Microanalysis / Volume 21 / Issue S3 / August 2015
  • Published online by Cambridge University Press: 23 September 2015, pp. 2369-2370
  • Print publication: August 2015
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  • Using Bethe Potentials in the Scattering Matrix for Defect Image Simulations
  • A. Wang, M. De Graef
  • Journal: Microscopy and Microanalysis / Volume 20 / Issue S3 / August 2014
  • Published online by Cambridge University Press: 27 August 2014, pp. 1030-1031
  • Print publication: August 2014
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  • Towards a Uniform Model for Lattice Defect Image Simulations
  • M. De Graef
  • Journal: Microscopy and Microanalysis / Volume 20 / Issue S3 / August 2014
  • Published online by Cambridge University Press: 27 August 2014, pp. 1022-1023
  • Print publication: August 2014
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  • Absorption Corrections for a Four-Quadrant SuperX EDS Detector
  • F. Yang, F. Scheltens, D. McComb, D.B. Williams, M. De Graef
  • Journal: Microscopy and Microanalysis / Volume 20 / Issue S3 / August 2014
  • Published online by Cambridge University Press: 27 August 2014, pp. 100-101
  • Print publication: August 2014
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  • Magnetic Phase Shift Computations for Electron Tomography
  • E. Humphrey, M. De Graef
  • Journal: Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
  • Published online by Cambridge University Press: 09 October 2013, pp. 786-787
  • Print publication: August 2013
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    Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • Comparison of Magnetic Domain Wall Images using Lorentz Microscopy and Magnetic Force Microscopy
  • S. Hua, M. De Graef
  • Journal: Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
  • Published online by Cambridge University Press: 09 October 2013, pp. 790-791
  • Print publication: August 2013
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    Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • Modified Transport-of-Intensity Approach for Electrostatic and Magnetic Phase Shift Separation
  • E. Humphrey, C. Phatak, M. De Graef
  • Journal: Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
  • Published online by Cambridge University Press: 09 October 2013, pp. 788-789
  • Print publication: August 2013
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    Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • Merging Monte Carlo and Dynamical EBSD Simulations
  • P. Callahan, M. De Graef
  • Journal: Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
  • Published online by Cambridge University Press: 09 October 2013, pp. 726-727
  • Print publication: August 2013
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    Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Page 1 of 3