0000000000957981

AUTHOR

Javier Yeste

showing 3 related works from this author

Direct Imaging of Chiral Domain Walls and Néel‐Type Skyrmionium in Ferrimagnetic Alloys

2021

International audience; The evolution of chiral spin structures is studied in ferrimagnet Ta/Ir/Fe/GdFeCo/Pt multilayers as a function of temperature using scanning electron microscopy with polarization analysis (SEMPA). The GdFeCo ferrimagnet exhibits pure right-hand Néel-type domain wall (DW) spin textures over a large temperature range. This indicates the presence of a negative Dzyaloshinskii-Moriya interaction (DMI) that can originate from both the top Fe/Pt and the Co/Pt interfaces. From measurements of the DW width, as well as complementary magnetic characterization, the exchange stiffness as a function of temperature is ascertained. The exchange stiffness is surprisingly mostly const…

Materials scienceSpintronicsCondensed matter physics530 PhysicsSkyrmionDirect imaging02 engineering and technologyType (model theory)021001 nanoscience & nanotechnologyCondensed Matter Physics530 Physik01 natural sciences[PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Electronic Optical and Magnetic MaterialsDomain (software engineering)BiomaterialsFerrimagnetism0103 physical sciencesElectrochemistry[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]chirals ; Neel domain walls ; skyrmioniums ; skyrmions spintronics010306 general physics0210 nano-technologyAdvanced Functional Materials
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Self-assembled metal-oxide nanoparticles on GaAs: infrared absorption enabled by localized surface plasmons

2021

Abstract Metal-oxides hold promise as superior plasmonic materials in the mid-infrared compared to metals, although their integration over established material technologies still remains challenging. We demonstrate localized surface plasmons in self-assembled, hemispherical CdZnO metal-oxide nanoparticles on GaAs, as a route to enhance the absorption in mid-infrared photodetectors. In this system, two localized surface plasmon modes are identified at 5.3 and 2.7 μm, which yield an enhancement of the light intensity in the underlying GaAs. In the case of the long-wavelength mode the enhancement is as large as 100 near the interface, and persists at depths down to 50 nm. We show numerically t…

Materials sciencequantum wellQC1-999Infrared spectroscopy02 engineering and technologyMetal oxide nanoparticles01 natural sciencesSelf assembledmetal-oxide0103 physical sciencesElectrical and Electronic Engineeringintersubband transition010306 general physicsQuantum wellcdolocalized surface plasmonbusiness.industryPhysics021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall EffectAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsOptoelectronics0210 nano-technologybusinessBiotechnologyLocalized surface plasmonNanophotonics
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Direct imaging of chiral domain walls and N\'eel-type skyrmionium in ferrimagnetic alloys

2021

The evolution of chiral spin structures is studied in ferrimagnet Ta/Ir/Fe/GdFeCo/Pt multilayers as a function of temperature using scanning electron microscopy with polarization analysis (SEMPA). The GdFeCo ferrimagnet exhibits pure right-hand N\'eel-type domain wall (DW) spin textures over a large temperature range. This indicates the presence of a negative Dzyaloshinskii-Moriya interaction (DMI) that can originate from both the top Fe/Pt and the Co/Pt interfaces. From measurements of the DW width, as well as complementary magnetic characterization, the exchange stiffness as a function of temperature is ascertained. The exchange stiffness is surprisingly mostly constant, which is explaine…

Condensed Matter - Materials Science
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