Výsledky vyhledávání - "Ramasse Quentin M."

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Magnon spectroscopy in the electron microscope

Autor: Kepaptsoglou, Demie, Castellanos-Reyes, José Ángel, Kerrigan, Adam, Nascimento, Júlio Alves Do, Zeiger, Paul M., Hajraoui, Khalil El, Idrobo, Juan Carlos, Mendis, Budhika G., Bergman, Anders, Lazarov, Vlado K., Rusz, Ján, Ramasse, Quentin M.

The miniaturisation of transistors is approaching its limits due to challenges in heat management and information transfer speed. To overcome these obstacles, emerging technologies such as spintronics are being developed, which leverage the electron'

Externí odkaz: http://arxiv.org/abs/2410.02908

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Theory of momentum-resolved magnon electron energy loss spectra: The case of Yttrium Iron Garnet

Autor: Nascimento, Julio A. do, Hasnip, Phil J., Cavill, S. A., Cossu, Fabrizio, Kepaptsoglou, Demie, Ramasse, Quentin M., Kerrigan, Adam, Lazarov, Vlado K.

We explore the inelastic spectra of electrons impinging in a magnetic system. The methodology here presented is intended to highlight the charge-dependent interaction of the electron beam in a STEM-EELS experiment, and the local vector potential gene

Externí odkaz: http://arxiv.org/abs/2401.12302

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Confined magnon dispersion in ferromagnetic and antiferromagnetic thin films in a second quantization approach: the case of Fe and NiO

Autor: Nascimento, Julio A. do, Kerrigan, Adam, Cavill, S. A., Hasnip, Phil J., Kepaptsoglou, Demie, Ramasse, Quentin M., Lazarov, Vlado K.

We present a methodology based on the calculation of the inelastic scattering from magnons via the spin scattering function in confined geometries such as thin films using a second quantization formalism, for both ferromagnetic and antiferromagnetic

Externí odkaz: http://arxiv.org/abs/2312.07715

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Observation of Antiferroelectric Domain Walls in a Uniaxial Hyperferroelectric

Autor: Conroy, Michele, Småbråten, Didrik René, Ophus, Colin, Shapovalov, Konstantin, Ramasse, Quentin M., Hunnestad, Kasper Aas, Selbach, Sverre M., Aschauer, Ulrich, Moore, Kalani, Gregg, J. Marty, Bangert, Ursel, Stengel, Massimiliano, Gruverman, Alexei, Meier, Dennis

Ferroelectric domain walls are a rich source of emergent electronic properties and unusual polar order. Recent studies showed that the configuration of ferroelectric walls can go well beyond the conventional Ising-type structure. N\'eel-, Bloch-, and

Externí odkaz: http://arxiv.org/abs/2309.02068

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Unveiling the impact of temperature on magnon diffuse scattering detection in the transmission electron microscope

Autor: Castellanos-Reyes, José Ángel, Zeiger, Paul, Bergman, Anders, Kepaptsoglou, Demie, Ramasse, Quentin M., Idrobo, Juan Carlos, Rusz, Ján

Publikováno v: Phys. Rev. B 108, 134435 (2023)

Magnon diffuse scattering (MDS) signals could be studied with high spatial resolution in scanning transmission electron microscopy (STEM), thanks to recent technological progress in electron energy loss spectroscopy. However, detecting MDS signals in

Externí odkaz: http://arxiv.org/abs/2302.11462

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