Lundi 17 Juillet 2023 à 11h00, Amalio Fernandez-Pacheco (Instituto de Nanociencia y Materiales de Aragón, CSIC-University of Zaragoza) donnera un séminaire en C2-50 (2nd étage, réception Thales).
Title :Towards Three Dimensional nanomaterials and devices
Abstract : he expansion of nanotechnology to three dimensions provides exciting opportunities to explore new physical phenomena and opens great prospects to create 3D devices for future computing technologies [1-2]. In this talk, I will present some of our recent works dedicated to the investigation of three dimensional artificial magnetic nanomaterials, including multilayered and complex-shaped geometries.
First, I will show how chiral spin interactions can be established in between neighbouring ferromagnetic layers separated by a thin metallic interlayer. This “interlayer DMI” interaction results in chiral exchange bias effect in synthetic antiferromagnets, and can be exploited as a tuneable symmetry-breaking effect for spintronic devices, and potentially to generate 3D chiral spin textures spanning across layers in multi-layered heterostructures [3,4].
The second part of the talk will provide an overview of the new methods we have developed to study 3D magnetic circuits patterned via focused-electron-beam-based 3D printing [5], and some of the new functionalities obtained exploiting 3D geometries. This includes the creation of localized spin textures, topological defects and stray fields [6-7], the automotive motion of domain walls [8], and the presence of unconventional magnetotransport effects [9]. Potential applications of these 3D methods to areas such as spintronics, magnonics or superconductivity will be discussed.
Acknowledgements
I would like to thank all my group members and collaborators contributing to the work I will be presenting.
This work is supported by the European Community under the Horizon 2020 Program, Contract No.
101001290 (3DNANOMAG).
References
[1] A. Fernández-Pacheco et al, Nature Comm. 8, 1 (2017).
[2] D. Makarov et al, Adv. Mater. 34, 2101758 (2022).
[3] A. Fernández-Pacheco et al, Nature Mater. 18, 679 (2019).
[4] M.A. Cascales-Sandoval et al, arXiv:2305.07327
[5] L. Skoric et al, Nano Letters 20, 184 (2020).
[6] D. Sanz-Hernández et al, ACS Nano 14, 8084 (2020).
[7] C. Donnelly et al, Nature Nanotechnol. 17, 136 (2022).
[8] L. Skoric et al, ACS Nano 16, 8860 (2022).
[9] F. Meng et al, ACS Nano 15, 6765 (2021)
