Publications by authors named "F Alaniz Camino"
Two-dimensional van der Waals magnets hosting topological magnetic textures, such as skyrmions, show promise for spintronics and quantum computing. Electrical control of these topological spin textures is crucial for enhancing operational performance and functionality. Here, using electron microscopy combined with electric and magnetic biasing, we show that the skyrmion helicity in insulating CrGeTe can be controlled by the direction of the external electric field applied during the field cooling process.
View Article and Find Full Text PDFSpin waves, or magnons, are essential for next-generation energy-efficient spintronics and magnonics. Yet, visualizing spin-wave dynamics at nanoscale and microwave frequencies remains a formidable challenge due to the lack of spin-sensitive, time-resolved microscopy. Here we report a breakthrough in imaging dipole-exchange spin waves in a ferromagnetic film owing to the development of laser-free ultrafast Lorentz electron microscopy, which is equipped with a microwave-mediated electron pulser for high spatiotemporal resolution.
View Article and Find Full Text PDFOn a two-dimensional crystal, a "superlattice" with nanometer-scale periodicity can be imposed to tune the Bloch electron spectrum, enabling novel physical properties inaccessible in the original crystal. While creating 2D superlattices by means of nanopatterned electric gates has been studied for band structure engineering in recent years, evidence of electron correlations─which drive many problems at the forefront of physics research─remains to be uncovered. In this work, we demonstrate signatures of a correlated insulator phase in Bernal-stacked bilayer graphene modulated by a gate-defined superlattice potential, manifested as resistance peaks centered at integer multiples of single electron per superlattice unit cell carrier densities.
View Article and Find Full Text PDFArticle Synopsis
- High-quality single crystalline GeSe can enhance the performance of solar cells and electronic devices compared to polycrystalline films.
- Researchers successfully used vapor-liquid-solid growth combined with direct lateral vapor-solid incorporation to produce uniform, large GeSe ribbons with controlled thickness and no defects.
- Electrical tests show that these ribbons have high Hall mobility and potential for applications like catalysis, thanks to their jagged edges when grown from mixed vapors.
Article Synopsis
- Aberration-corrected electron-beam lithography (AC-EBL) has achieved impressive nanometer-scale resolution using ultra-thin electron transparent membranes with widely used resists like PMMA and hydrogen silsesquioxane.
- Challenges in focusing the beam on thick, electron-opaque substrates are discussed, along with potential solutions to improve the lithography process.
- The study emphasizes that while proximity effects can restrict the pitch of patterned holes, substrate thickness has minimal impact on pattern quality, suggesting a need for advanced resists for better performance in quantum device fabrication.