Homochiral antiferromagnetic merons, antimerons and bimerons realized in synthetic antiferromagnets

Mona Bhukta, Takaaki Dohi (), Venkata Krishna Bharadwaj, Ricardo Zarzuela, Maria-Andromachi Syskaki, Michael Foerster, Miguel Angel Niño, Jairo Sinova, Robert Frömter () and Mathias Kläui ()
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Mona Bhukta: Johannes Gutenberg-University Mainz
Takaaki Dohi: Johannes Gutenberg-University Mainz
Venkata Krishna Bharadwaj: Johannes Gutenberg-University Mainz
Ricardo Zarzuela: Johannes Gutenberg-University Mainz
Maria-Andromachi Syskaki: Johannes Gutenberg-University Mainz
Michael Foerster: ALBA Synchrotron Light Facility
Miguel Angel Niño: ALBA Synchrotron Light Facility
Jairo Sinova: Johannes Gutenberg-University Mainz
Robert Frömter: Johannes Gutenberg-University Mainz
Mathias Kläui: Johannes Gutenberg-University Mainz

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The ever-growing demand for device miniaturization and energy efficiency in data storage and computing technology has prompted a shift towards antiferromagnetic topological spin textures as information carriers. This shift is primarily owing to their negligible stray fields, leading to higher possible device density and potentially ultrafast dynamics. We realize in this work such chiral in-plane topological antiferromagnetic spin textures namely merons, antimerons, and bimerons in synthetic antiferromagnets by concurrently engineering the effective perpendicular magnetic anisotropy, the interlayer exchange coupling, and the magnetic compensation ratio. We demonstrate multimodal vector imaging of the three-dimensional Néel order parameter, revealing the topology of those spin textures and a globally well-defined chirality, which is a crucial requirement for controlled current-induced dynamics. Our analysis reveals that the interplay between interlayer exchange and interlayer magnetic dipolar interactions plays a key role to significantly reduce the critical strength of the Dzyaloshinskii-Moriya interaction required to stabilize topological spin textures, such as antiferromagnetic merons, in synthetic antiferromagnets, making them a promising platform for next-generation spintronics applications.

Date: 2024
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DOI: 10.1038/s41467-024-45375-z

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