Quantitative imaging of hybrid chiral spin textures in magnetic multilayer systems by Lorentz microscopy

Fallon, K., McVitie, S. , Legrand, W., Ajejas, F., Maccariello, D., Collin, S., Cros, V. and Reyren, N. (2019) Quantitative imaging of hybrid chiral spin textures in magnetic multilayer systems by Lorentz microscopy. Physical Review B, 100, 214431. (doi: 10.1103/PhysRevB.100.214431)

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Abstract

Chiral magnetic textures in ultrathin perpendicularly magnetised multilayer film stacks with an interfacial Dzyaloshinskii-Moriya interaction have been the focus of much research recently. The chirality associated with the broken inversion symmetry at the interface between an ultrathin ferromagnetic layer and a heavy metal with large spin-orbit coupling supports homochiral Nel domain walls and hedgehog (Nel) skyrmions. Under spin-orbit torques these Nel type magnetic structures are predicted, and have been measured, to move at high velocities. However recent studies have indicated that some multilayered systems may possess a more complex hybrid domain wall configuration, due to the competition between interfacial DMI and interlayer dipolar fields. These twisted textures are expected to have thickness dependent Nel and Bloch contributions to the domain or skyrmion walls. In this work, we use the methods of Lorentz microscopy to measure quantitatively for the first time experimentally both; i) the contributions of the Nel and Bloch contributions and ii) their spatial spin variation at high resolution. These are compared with modelled and simulated structures which are in excellent agreement with our experimental results. Our quantitative analysis provides powerful direct evidence of the Bloch wall component which exists in these hybrid walls and will be significant when exploiting such phenomena in spintronic applications.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McVitie, Professor Stephen and Fallon, Ms Kayla
Authors: Fallon, K., McVitie, S., Legrand, W., Ajejas, F., Maccariello, D., Collin, S., Cros, V., and Reyren, N.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190883Consortium for advanced materials based on spin chiralityStephen McVitieEngineering and Physical Sciences Research Council (EPSRC)EP/M024423/1P&S - Physics & Astronomy
172091MAGicSkyStephen McVitieEuropean Commission (EC)Stamps, Professor RobertP&S - Physics & Astronomy