BUSCADOR RECOLECTA

Digital.CSIC. Repositorio Institucional del CSIC

oai:digital.csic.es:10261/286913

Cylindrical magnetic nanowires are promising systems for the development of three-dimensional spintronic devices. Here, we simulate the evolution of magnetic states during fabrication of strongly-coupled cylindrical nanowires with varying degrees of overlap. By varying the separation between wires, the relative strength of exchange and magnetostatic coupling can be tuned. Hence, we observe the formation of six fundamental states as a function of both inter-wire separation and wire height. In particular, two complex three-dimensional magnetic states, a 3D Landau Pattern and a Helical domain wall, are observed to emerge for intermediate overlap. These two emergent states show complex spin configurations, including a modulated domain wall with both Néel and Bloch character. The competition of magnetic interactions and the parallel growth scheme we follow (growing both wires at the same time) favours the formation of these anti-parallel metastable states. This works shows how the engineering of strongly coupled 3D nanostructures with competing interactions can be used to create complex spin textures., This work was supported by the EPSRC and the Centre for Doctoral Training (CDT) in Photonic Integration and Advanced Data Storage (PIADS), RCUK Grant No. EP/L015323/1, the European Community under the Horizon 2020 Program, Contract No. 101001290 (3DNANOMAG), the MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1), and the Aragon Government through the Project Q-MAD. AH-R acknowledges the support from European Union's Horizon 2020 research and innovation program under Marie Skłodowska-Curie Grant ref. H2020-MSCA-IF-2016-746958, from the Spanish MICIN under Grant PID2019-104604RB/AEI/10.13039/501100011033 and from the Asturias FICYT under Grant AYUD/2021/51185 with the support of FEDER funds. CINN (CSIC—Universidad de Oviedo), El Entrego, Spain LS acknowledges support from the University of Cambridge (EPSRC Cambridge NanoDTC EP/L015978/1) DH acknowledges Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France. CD acknowledges funding from the Max Planck Society Lise Meitner Excellence Program., Peer reviewed