Quantification of Mixed Bloch-Néel Topological Spin Textures Stabilized by the Dzyaloshinskii-Moriya Interaction in Co/Pd Multilayers

Garlow, Joseph A.; Pollard, Shawn D.; Beleggia, Marco; Dutta, Tanmay; Yang, Hyunsoo; Zhu, Yimei

doi:10.1103/PhysRevLett.122.237201

Title: Quantification of Mixed Bloch-Néel Topological Spin Textures Stabilized by the Dzyaloshinskii-Moriya Interaction in $Co / Pd$ Multilayers

Journal Article · 09 June 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.122.237201 · OSTI ID:1546048

^[1]; Pollard, Shawn D. ^[2]; Beleggia, Marco ^[3]; Dutta, Tanmay ^[2]; Yang, Hyunsoo ^[2]; Zhu, Yimei ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
National Univ. of Singapore (Singapore)
Technical Univ. of Denmark, Lyngby (Denmark)

The three-dimensional structure of nanoscale topological spin textures stabilized by the Dzyaloshinskii-Moriya interaction is governed by the delicate competition between the exchange, demagnetization, and anisotropy energies. The quantification of such spin textures through direct experimental methods is crucial towards understanding the fundamental physics associated with their ordering, as well as their manipulation in spintronic devices. Here in this work, we extend the Lorentz transmission electron microscopy technique to quantify mixed Bloch-Néel chiral spin textures stabilized by the Dzyaloshinskii-Moriya interaction in Co / Pd multilayers. Analysis of the observed intensities under varied imaging conditions coupled to corroborative micromagnetic simulations yields vital parameters that dictate the stability and properties of the complex spin texture, namely, the degree of mixed Bloch-Néel character, the domain wall width, the strength of the Dzyaloshinskii-Moriya interaction, and the exchange stiffness. In conclusion, this approach provides the necessary framework for the application of quantitative Lorentz phase microscopy to a broad array of topological spin systems.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0012704

OSTI ID:: 1546048

Alternate ID(s):: OSTI ID: 1546360

Report Number(s):: BNL--211920-2019-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 122; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Quantification of Mixed Bloch-Néel Topological Spin Textures Stabilized by the Dzyaloshinskii-Moriya Interaction in $Co / Pd$ Multilayers