Research Data Leeds Repository

Citation

Shahbazi, Kowsar and Hrabec, Aleš and Moretti, Simone and Ward, Michael B. and Moore, Thomas A. and Jeudy, Vincent and Martinez, Eduardo and Marrows, Christopher H. (2018) Magnetic properties and field-driven dynamics of chiral domain walls in epitaxial Pt/Co/AuxPt1-x trilayers - dataset. University of Leeds. [Dataset] https://doi.org/10.5518/471

Dataset description

Chiral domain walls in ultrathin perpendicularly magnetised layers have a N\'{e}el structure stabilised by a Dzyaloshinskii-Moriya interaction (DMI) that is generated at the interface between the ferromagnet and a heavy metal. Different interface materials or properties are required above and below a ferromagnetic film in order to generate the structural inversion asymmetry needed to ensure that the DMI arising at the two interfaces does not cancel. Here we report on the magnetic properties of epitaxial Pt/Co/Au$_x$Pt$_{1-x}$ trilayers grown by sputtering onto sapphire substrates with 0.6~nm thick Co. As $x$ rises from 0 to 1 a structural inversion asymmetry is progressively generated. We characterise the epilayer structure with x-ray diffraction and cross-sectional transmission electron microscopy, revealing (111) stacking. The saturation magnetization falls as the proximity magnetisation in Pt is reduced, whilst the perpendicular magnetic anisotropy $K_\mathrm{u}$ rises. The micromagnetic DMI strength $D$ was determined using the bubble expansion technique and also rises from a negligible value when $x=0$ to $\sim 1$~mJ/m$^2$ for $x = 1$. The depinning field at which field-driven domain wall motion crosses from the creep to the depinning regime rises from $\sim 40$ to $\sim 70$~mT, attributed to greater spatial fluctuations of the domain wall energy with increasing Au concentration. Meanwhile, the increase in DMI causes the Walker field to rise from $\sim 10$ to $\sim 280$~mT, meaning that only in the $x = 1$ sample is the steady flow regime accessible. The full dependence of domain wall velocity on driving field bears little resemblance to the prediction of a simple one-dimensional model, but can be described very well using micromagnetic simulations with a realistic model of disorder. These reveal a rise in Gilbert damping as $x$ increases.

Subjects:	F000 - Physical sciences > F300 - Physics > F320 - Chemical physics > F321 - Solid-state physics
Divisions:	Faculty of Engineering and Physical Sciences > School of Chemical and Process Engineering Faculty of Engineering and Physical Sciences > School of Physics and Astronomy
Related resources:	Location Type https://doi.org/10.1103/PhysRevB.98.214413 Publication http://eprints.whiterose.ac.uk/137662/ Publication
License:	Creative Commons Attribution 4.0 International (CC BY 4.0)
Date deposited:	10 Dec 2018 18:49
URI:	https://archive.researchdata.leeds.ac.uk/id/eprint/469
Additional details Additional details Creators or authors: Creators ORCID Other ID Email Primary affiliation Primary affiliation ID Primary affiliation ID type Secondary affiliation Secondary affiliation ID Secondary affiliation ID type Shahbazi, Kowsar https://orcid.org/0000-0002-1082-4535 University of Leeds https://ror.org/024mrxd33 ror Hrabec, Aleš https://orcid.org/0000-0002-2895-1962 University of Leeds https://ror.org/024mrxd33 ror Moretti, Simone https://orcid.org/0000-0002-7586-2217 University of Salamanca https://ror.org/02f40zc51 ror Ward, Michael B. University of Leeds https://ror.org/024mrxd33 ror Moore, Thomas A. https://orcid.org/0000-0001-6443-2556 University of Leeds https://ror.org/024mrxd33 ror Jeudy, Vincent https://orcid.org/0000-0002-0954-5686 Université Paris-Saclay https://ror.org/03xjwb503 ror Martinez, Eduardo https://orcid.org/0000-0003-2960-5508 University of Salamanca https://ror.org/02f40zc51 ror Marrows, Christopher H. https://orcid.org/0000-0003-4812-6393 University of Leeds https://ror.org/024mrxd33 ror Type of data: Dataset Research funders: EU 'WALL' Grant numbers: FP7-PEOPLE-2013-ITN 608031 Publication date: 2018 Resource language: English Metadata language: English Publisher: University of Leeds Contact email: c.h.marrows@leeds.ac.uk Last Modified: 29 Jul 2024 14:01

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