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Depth-dependent magnetic crossover in a room-temperature skyrmion-hosting multilayer [dataset] Open Access

Skyrmion-hosting multilayer stacks are promising avenues for applications, although little is known about the depth dependence of the magnetism. We address this by reporting the results of circular dichroic resonant elastic x-ray scattering (CD-REXS), micromagnetic simulations, and low-energy muon-spin rotation (LE-μ+SR) measurements on a stack comprising [Ta/CoFeB/MgO]16/Ta on a Si substrate. Energy-dependent CD-REXS shows a continuous, monotonic evolution of the domain-wall helicity angle with incident energy, consistent with a three-dimensional hybrid domain-wall-like structure that changes from Néel-like near the surface to Bloch-like deeper within the sample. LE-μ+SR reveals that the magnetic field distribution in the trilayers near the surface of the stack is distinct from that in trilayers deeper within the sample. Our micromagnetic simulations support a quantitative analysis of the μ+SR results. By increasing the applied magnetic field, we find a reduction in the volume occupied by domain walls at all depths, consistent with a crossover into a region dominated by skyrmions above approximately 180 mT.

Descriptions

Resource type

Dataset

Contributors

Data collector: Hicken, T.J. ¹
Data collector: Wilson, M.N. ¹
Data collector: Salman, Z. ²
Data collector: Zhang, S.L. ³
Data collector: Holt, S.J.R. ⁴
Data collector: Prokscha, T. ²
Data collector: Suter, A. ²
Data collector: Pratt, F.L. ⁵
Data collector: van der Laan, G. ⁶
Data collector: Hesjedal, T. ⁷
Creator: Lancaster, T. ¹
Data collector: Lancaster, T. ¹

¹ Durham University
² Paul Scherrer Institute, Switzerland
³ ShanghaiTech University, China
⁴ Max Planck Institute for the Structure and Dynamics of Matter, Germany
⁵ STFC-ISIS Facility, UK
⁶ Diamond Light Source, UK
⁷ University of Oxford, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Other description

Keyword

Skyrmions
Magnetic order
Magnetic multilayers
Micromagnetic modeling
Muon spin relaxation and rotation
X-ray magnetic circular dichroism

Subject

Skyrme model

Location

Language

Cited in

doi:10.1103/PhysRevB.109.134423

Identifier

ark:/32150/r2qn59q403m
doi:10.15128/r2qn59q403m

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

T. Lancaster

Date Uploaded

18 March 2024, 10:03:15

Date Modified

24 June 2024, 11:06:39

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Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 116028004

Last modified: 2024:06:21 09:14:59+01:00

Filename: archive.zip

Original checksum: b1fd69b611182f447054ab0140b69973