Sökning: onr:"swepub:oai:DiVA.org:uu-304515" >
Magnetic Effects in...
Magnetic Effects in the Paraxial Regime of Elastic Electron Scattering
-
- Edström, Alexander (författare)
- Uppsala universitet,Materialteori
-
- Lubk, Axel (författare)
- Tech Univ Dresden, Triebenberg Lab, Dresden, Germany
-
- Rusz, Jan (författare)
- Uppsala universitet,Materialteori
-
(creator_code:org_t)
- 2016
- 2016
- Engelska.
-
Ingår i: Physical review B: covering condensed matter and materials physics. - 2469-9950. ; 94:17
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Motivated by a recent claim [Phys.Rev.Lett. 116, 127203 ( 2016)] that electron vortex beams can be used to image magnetism at the nanoscale in elastic scattering experiments, using transmission electron microscopy, a comprehensive computational study is performed to study magnetic effects in the paraxial regime of elastic electron scattering in magnetic solids. Magnetic interactions from electron vortex beams, spin polarized electron beams, and beams with phase aberrations are considered, as they pass through ferromagnetic FePt or antiferromagnetic LaMnAsO. The magnetic signals are obtained by comparing the intensity over a disk in the diffraction plane for beams with opposite angular momentum or aberrations. The strongest magnetic signals are obtained from vortex beams with large orbital angular momentum, where relative magnetic signals above 10(-3) are indicated for 10 (h) over bar orbital angular momentum, meaning that relative signals of one percent could be expected with the even larger orbital angular momenta, which have been produced in experimental setups. All results indicate that beams with low acceleration voltage and small convergence angles yield stronger magnetic signals, which is unfortunately problematic for the possibility of high spatial resolution imaging. Nevertheless, under atomic resolution conditions, relative magnetic signals in the order of 10(-4) are demonstrated, corresponding to an increase with one order of magnitude compared to previous work.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Vortex beams
- magnetism
- electron microscopy
- scattering theory
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas