Lorentz Transmission Electron Microscopy Image Simulations of Experimental Nano-Chessboard Observations in Co-Pt Alloys. (1st June 2018)

• Record Type: Journal Article
• Authors: Kashyap, Isha; Jin, Yongmei M.; Vetter, Eric P.; Floro, Jerrold A.; De Graef, Marc
• Is Part Of: Microscopy and microanalysis. Volume 24:Number 3(2018)
• Page Start: 221
• Page End: 226
• Publication Date: 2018-06-01
• Subjects: Lorentz transmission electron microscopy, -- phase reconstruction, -- magnetic phase shift, -- nano-chessboard structure, -- magnetic domain wall; Microscopy -- Periodicals; Microchemistry -- Periodicals; 502.82
• DOI: 10.1017/S143192761800034X
• Languages: English
• ISSNs: 1431-9276

Abstract

Abstract: The magnetization configuration of a novel nano-chessboard structure consisting of L10 and L12 phases in a Co40 Pt60 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.