Non-planar geometrical effects on the magnetoelectrical signal in a three-dimensional nanomagnetic circuit

Meng, F. et al. (2021) Non-planar geometrical effects on the magnetoelectrical signal in a three-dimensional nanomagnetic circuit. ACS Nano, 15(4), pp. 6765-6773. (doi: 10.1021/acsnano.0c10272) (PMID:33848131) (PMCID:PMC8155340)

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Expanding nanomagnetism and spintronics into three dimensions (3D) offers great opportunities for both fundamental and technological studies. However, probing the influence of complex 3D geometries on magnetoelectrical phenomena poses important experimental and theoretical challenges. In this work, we investigate the magnetoelectrical signals of a ferromagnetic 3D nanodevice integrated into a microelectronic circuit using direct-write nanofabrication. Due to the 3D vectorial nature of both electrical current and magnetization, a complex superposition of several magnetoelectrical effects takes place. By performing electrical measurements under the application of 3D magnetic fields, in combination with macrospin simulations and finite element modeling, we disentangle the superimposed effects, finding how a 3D geometry leads to unusual angular dependences of well-known magnetotransport effects such as the anomalous Hall effect. Crucially, our analysis also reveals a strong role of the noncollinear demagnetizing fields intrinsic to 3D nanostructures, which results in an angular dependent magnon magnetoresistance contributing strongly to the total magnetoelectrical signal. These findings are key to the understanding of 3D spintronic systems and underpin further fundamental and device-based studies.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hierro Rodriguez, Dr Aurelio and Fernandez-Pacheco, Dr Amalio
Authors: Meng, F., Donnelly, C., Abert, C., Skoric, L., Holmes, S., Xiao, Z., Liao, J.-W., Newton, P. J., Barnes, C. H.W., Sanz-Hernández, D., Hierro-Rodriguez, A., Suess, D., Cowburn, R. P., and Fernández-Pacheco, A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:ACS Nano
Publisher:American Chemical Society
ISSN (Online):1936-086X
Published Online:13 April 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in ACS Nano 15(4): 6765-6773
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
306323Writing nanomagnets: Investigation of new magnetic nanostructures fabricated byAmalio Fernandez-PachecoEngineering and Physical Sciences Research Council (EPSRC)EP/M008517/2P&S - Physics & Astronomy