Magnetic imaging of novel 3D FEBID nanomagnets by Electron Holography
César Magén, INMA, Spain
Monday, 19 October 2026, 12.00 PM
ICMAB - Sala d'Actes MATGAS
Abstract
Three-dimensional (3D) magnetic nanostructures exhibit novel magnetic phenomena driven by scale reduction and geometry that are absent in bulk materials, opening new avenues for high-density nanoelectronics, data storage, and sensing technologies. However, patterning 3D nanomagnets remains an experimental bottleneck due to the scarcity of suitable synthesis methods. Focused Electron Beam Induced Deposition (FEBID) has emerged as a powerful direct-write nanofabrication technique that enables the growth of complex 3D nanostructures with near-arbitrary geometries, making it ideal for device prototyping and exploring topology-induced magnetic effects. To understand nanoscale magnetic configurations, validate micromagnetic models, and optimize design, quantitative local characterization is essential. In this context, off-axis electron holography stands out as a highly suitable nanometer-resolution quantitative magnetic imaging tool for nanoscale ferromagnets. In this lecture, the fundamental principles of electron holography and its key applications in 3D FEBID magnetic nanostructures will be reviewed. Supported by electron holography and related electron microscopy techniques, this talk highlights core challenges in controlling geometry, composition, and microstructure, alongside strategies to enhance magnetic performance—such as deposition optimization, post-growth processing, and heterostructuring. Finally, as a demonstration of combining FEBID optimization, advanced holography, and micromagnetic simulations, the observation of novel magnetic textures in FEBID-fabricated magnetic nanotubes will be presented.
Short bio
PhD in Physics in 2005. Postdoctoral fellow at CEMES-CNRS (Toulouse, 2006-07) and Oak Ridge National Laboratory (USA, 2007-08). ARAID reseach fellow at the Instituto de Nanociencia de Aragón (2008-17). Appointed Científico Titular CSIC at Instituto de Ciencia de Materiales de Aragón (INMA). Currently he is Investigador Científico CSIC at the Instituto de Nanociencia y Materiales de Aragón (INMA) His research is focused on functional nanomaterials, particularly complex oxides thin films and nanoscale ferromagnets for spintronics and memory applications, investigated by advanced scanning transmission elector microscopy techniques (STEM) and electron holography.
Hosted by Alberto Pomar, from the ACNM research group (Materials for Electronics Research Line)
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