Issue 43, 2023

Manipulating topological Hall-like signatures by interface engineering in epitaxial ruthenate/manganite heterostructures

Abstract

Topologically protected non-trivial spin textures (e.g. skyrmions) give rise to a novel phenomenon called the topological Hall effect (THE) and have promising implications in future energy-efficient nanoelectronic and spintronic devices. Here, we have studied the Hall effect in SrRuO3/La0.42Ca0.58MnO3 (SRO/LCMO) bilayers. Our investigation suggests that pure SRO has hard and soft magnetic characteristics but the anomalous Hall effect (AHE) in SRO is governed by the high coercivity phase. We have shown that the proximity effect of a soft magnetic LCMO on SRO plays a critical role in interfacial magnetic coupling and transport properties in SRO. Upon reducing the SRO thickness in the bilayer, the proximity effect becomes the dominant feature, enhancing the magnitude and temperature range of THE-like signatures. The THE-like features in bilayers can be explained by a diffusive Berry phase transition model in the presence of an emergent magnetic state due to interface coupling. This work provides an alternative understanding of THE-like signatures and their manipulation in SRO-based heterostructures, bilayers and superlattices.

Graphical abstract: Manipulating topological Hall-like signatures by interface engineering in epitaxial ruthenate/manganite heterostructures

Supplementary files

Article information

Article type
Paper
Submitted
25 May 2023
Accepted
11 Oct 2023
First published
11 Oct 2023

Nanoscale, 2023,15, 17589-17598

Manipulating topological Hall-like signatures by interface engineering in epitaxial ruthenate/manganite heterostructures

P. Roy, D. Zhang, A. R. Mazza, N. Cucciniello, S. Kunwar, H. Zeng, A. Chen and Q. Jia, Nanoscale, 2023, 15, 17589 DOI: 10.1039/D3NR02407E

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