Magnon diffuse scattering in scanning transmission electron microscopy

TY - UNPB

T1 - Magnon diffuse scattering in scanning transmission electron microscopy

AU - Lyon, Keenan

AU - Bergman, Anders

AU - Zeiger, Paul

AU - Kepaptsoglou, Demie

AU - Ramasse, Quentin M.

AU - Idrobo, Juan Carlos

AU - Rusz, Ján

N1 - 6 pages, 3 figures

PY - 2021/5/10

Y1 - 2021/5/10

N2 - We present a theory and a simulation of thermal diffuse scattering due to the excitation of magnons in scanning transmission electron microscopy. The calculations indicate that magnons can present atomic contrast when detected by electron energy-loss spectroscopy using atomic-size electron beams. The results presented here indicate that the intensity of the magnon diffuse scattering in bcc iron at 300~K is 4 orders of magnitude weaker than the intensity of thermal diffuse scattering arising from atomic vibrations. In an energy range where the phonon and magnon dispersions do not overlap, a monochromated scanning transmission electron microscope equipped with direct electron detectors for spectroscopy is expected to resolve the magnon spectral signatures.

AB - We present a theory and a simulation of thermal diffuse scattering due to the excitation of magnons in scanning transmission electron microscopy. The calculations indicate that magnons can present atomic contrast when detected by electron energy-loss spectroscopy using atomic-size electron beams. The results presented here indicate that the intensity of the magnon diffuse scattering in bcc iron at 300~K is 4 orders of magnitude weaker than the intensity of thermal diffuse scattering arising from atomic vibrations. In an energy range where the phonon and magnon dispersions do not overlap, a monochromated scanning transmission electron microscope equipped with direct electron detectors for spectroscopy is expected to resolve the magnon spectral signatures.

KW - cond-mat.mtrl-sci

M3 - Preprint

BT - Magnon diffuse scattering in scanning transmission electron microscopy

ER -