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Simulations of magn...
Simulations of magnetic Bragg scattering in transmission electron microscopy
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- Snarski-Adamski, Justyn (author)
- Polish Acad Sci, Inst Mol Phys, M Smoluchowskiego 17, PL-60179 Poznan, Poland.
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- Edström, Alexander, 1988- (author)
- KTH,Material- och nanofysik,AlbaNova Univ Ctr, KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, S-10691 Stockholm, Sweden.
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- Zeiger, Paul (author)
- Uppsala Univ, Dept Phys & Astron, Div Mat Theory, Box 516, SE-75120 Uppsala, Sweden.
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- Castellanos-Reyes, José Ángel (author)
- Uppsala universitet,Materialteori
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- Lyon, Keenan (author)
- Uppsala universitet,Materialteori
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- Werwinski, Miroslaw (author)
- Polish Acad Sci, Inst Mol Phys, M Smoluchowskiego 17, PL-60179 Poznan, Poland.
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- Rusz, Ján, 1979- (author)
- Uppsala universitet,Materialteori
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Polish Acad Sci, Inst Mol Phys, M Smoluchowskiego 17, PL-60179 Poznan, Poland Material- och nanofysik (creator_code:org_t)
- Elsevier BV, 2023
- 2023
- English.
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In: Ultramicroscopy. - : Elsevier BV. - 0304-3991 .- 1879-2723. ; 247
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Abstract
Subject headings
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- We have simulated the magnetic Bragg scattering in transmission electron microscopy in two antiferromagnetic compounds, NiO and LaMnAsO. This weak magnetic phenomenon was experimentally observed in NiO by Loudon (2012). We have computationally reproduced Loudon's experimental data, and for comparison we have performed calculations for the LaMnAsO compound as a more challenging case, containing lower concentration of magnetic elements and strongly scattering heavier non-magnetic elements. We have also described thickness and voltage dependence of the intensity of the antiferromagnetic Bragg spot for both compounds. We have considered lattice vibrations within two computational approaches, one assuming a static lattice with Debye-Waller smeared potentials, and another explicitly considering the atomic vibrations within the quantum excitations of phonons model (thermal diffuse scattering). The structural analysis shows that the antiferromagnetic Bragg spot appears in between (111) and (000) reflections for NiO, while for LaMnAsO the antiferromagnetic Bragg spot appears at the position of the (010) reflection in the diffraction pattern, which corresponds to a forbidden reflection of the crystal structure. Calculations predict that the intensity of the magnetic Bragg spot in NiO is significantly stronger than thermal diffuse scattering at room temperature. For LaMnAsO, the magnetic Bragg spot is weaker than the room-temperature thermal diffuse scattering, but its detection can be facilitated at reduced temperatures.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Multislice calculations
- Antiferromagnetism
- Bragg scattering
- Transmission electron microscopy
- Magnetism
Publication and Content Type
- ref (subject category)
- art (subject category)
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