Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/1982
Title: Effect of Bloch wave electron propagation and momentum-resolved signal detection on the quantitative and site-specific electron magnetic chiral dichroism of magnetic spinel oxide thin films
Authors: Loukya, B.
Negi, D. S.
Dileep, K.
Pachauri, N.
Gupta, A.
Datta, Ranjan
Keywords: Condensed Matter Physics
Chemical-Vapor-Deposition
Energy-Loss Spectroscopy
Circular-Dichroism
Software Package
Microscope
Diffraction
Simulation
Cobalt
Space
Probe
Publisher: American Physical Society
Citation: Physical Review B
91
13
Loukya, B.; Negi, D. S.; Dileep, K.; Pachauri, N.; Gupta, A.; Datta, R., Effect of Bloch wave electron propagation and momentum-resolved signal detection on the quantitative and site-specific electron magnetic chiral dichroism of magnetic spinel oxide thin films. Physical Review B 2015, 91 (13), 10.
Abstract: Electron magnetic chiral dichroism (EMCD) in a transmission electron microscope is an element-specific magnetic characterization technique and is extremely powerful for understanding magnetism of materials at the nanoscale. However, quantitative EMCD remains a challenge. In the present paper, we have highlighted and overcome major difficulties associated with the technique. For example, the experimentally observed low dichroic signal and imbalance between the L-3 and L-2 edge have been explained based on the oscillatory nature of electron propagation through the crystal thickness and specific momentum resolved signal detection, respectively. With this advancement in understanding, site-specific quantitative EMCD has been accomplished in epitaxial thin films of two important ferrimagnetic spinel oxides, NiFe2O4 (NFO) and CoFe2O4 (CFO), with varying degree of cation mixing and A site cation defects. A simple model based on phenomenological absorption has been developed for different site-specific signal contributions for the inverse spinel structure. The experimental moment values for NFO and CFO obtained using EMCD are in good agreement with first principle based theoretical calculations and the results strengthen the promise of utilizing EMCD as a routine nanoscale magnetic characterization technique.
Description: Restricted access
URI: http://hdl.handle.net/10572/1982
ISSN: 1098-0121
Appears in Collections:Research Articles (Ranjan Datta)

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