Issue 66, 2019

Nanoscale magnetic and charge anisotropies at manganite interfaces

Abstract

Strong correlated manganites are still under intense research owing to their complex phase diagrams in terms of Sr-doping and their sensitivity to intrinsic and extrinsic structural deformations. Here, we performed X-ray absorption spectroscopy measurements of manganite bilayers to explore the effects that a local Sr-doping gradient produce on the charge and antiferromagnetic anisotropies. In order to gradually tune the Sr-doping level along the axis perpendicular to the samples we have grown a series of bilayers with different thicknesses of low-doped manganites (from 0 nm to 6 nm) deposited over a La0.7Sr0.3MnO3 metallic layer. This strategy permitted us to resolve with high accuracy the thickness region where the charge and spin anisotropies vary and the critical thickness tc over which the out of plane orbital asymmetry does not have any further modifications. We found that the antiferromagnetic spin axis points preferentially out of the sample plane regardless the capping layer thickness. However, it tilts partially into the sample plane far from this critical thickness, owing to the combined contributions of the external structural strain and electron doping. Furthermore, we found that the doping level of the capping layer strongly affects the critical thickness, giving clear evidence of the influence exerted by the electron doping on the orbital and magnetic configurations. These anisotropic changes induce subtle modifications on the domain reorientation of La0.7Sr0.3MnO3, as evidenced from the magnetic hysteresis cycles.

Graphical abstract: Nanoscale magnetic and charge anisotropies at manganite interfaces

Supplementary files

Article information

Article type
Paper
Submitted
20 Aug 2019
Accepted
06 Nov 2019
First published
25 Nov 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 38604-38611

Nanoscale magnetic and charge anisotropies at manganite interfaces

S. J. Carreira, M. H. Aguirre, J. Briatico and L. B. Steren, RSC Adv., 2019, 9, 38604 DOI: 10.1039/C9RA06552K

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