Observation of stable Néel skyrmions in cobalt/palladium multilayers with Lorentz transmission electron microscopy

Pollard, Shawn D.; Garlow, Joseph A.; Yu, Jiawei; Wang, Zhen; Zhu, Yimei; Yang, Hyunsoo

doi:10.1038/ncomms14761

Observation of stable Néel skyrmions in cobalt/palladium multilayers with Lorentz transmission electron microscopy

Journal Article · Fri Mar 10 04:00:00 EST 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms14761· OSTI ID:1372428

Pollard, Shawn D. ^[1]; Garlow, Joseph A. ^[2]; Yu, Jiawei ^[1]; Wang, Zhen ^[3]; Zhu, Yimei ^[4]; Yang, Hyunsoo ^[1]

National Univ. of Singapore (Singapore). Dept. of Electrical and Computer Engineering
Stony Brook Univ., NY (United States). Dept. of Material Science and Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.

Néel skyrmions are of high interest due to their potential applications in a variety of spintronic devices, currently accessible in ultrathin heavy metal/ferromagnetic bilayers and multilayers with a strong Dzyaloshinskii–Moriya interaction. Here in this paper we report on the direct imaging of chiral spin structures including skyrmions in an exchange-coupled cobalt/palladium multilayer at room temperature with Lorentz transmission electron microscopy, a high-resolution technique previously suggested to exhibit no Néel skyrmion contrast. Phase retrieval methods allow us to map the internal spin structure of the skyrmion core, identifying a 25 nm central region of uniform magnetization followed by a larger region characterized by rotation from in- to out-of-plane. The formation and resolution of the internal spin structure of room temperature skyrmions without a stabilizing out-of-plane field in thick magnetic multilayers opens up a new set of tools and materials to study the physics and device applications associated with chiral ordering and skyrmions.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704; AC02-98CH10886

OSTI ID:: 1372428

Report Number(s):: BNL--113855-2017-JA; KC0201010

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Chirality in Magnetic Multilayers Probed by the Symmetry and the Amplitude of Dichroism in X-Ray Resonant Magnetic Scattering Chauleau, Jean-Yves; Legrand, William; Reyren, Nicolas Physical Review Letters, Vol. 120, Issue 3 https://doi.org/10.1103/physrevlett.120.037202	journal	January 2018
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 Physical Review Letters, Vol. 122, Issue 23 https://doi.org/10.1103/physrevlett.122.237201	journal	June 2019
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems Manchon, A.; Železný, J.; Miron, I. M. Reviews of Modern Physics, Vol. 91, Issue 3 https://doi.org/10.1103/revmodphys.91.035004	journal	September 2019
Observation of Robust Néel Skyrmions in Metallic PtMnGa Srivastava, Abhay K.; Devi, Parul; Sharma, Ankit K. FID GEO https://doi.org/10.23689/fidgeo-4603	text	January 2019
Spin-wave propagation in the presence of inhomogeneous Dzyaloshinskii-Moriya interactions Lee, Seung-Jae; Moon, Jung-Hwan; Lee, Hyun-Woo arXiv https://doi.org/10.48550/arxiv.1711.10082	text	January 2017
Proposal for a micromagnetic standard problem for materials with Dzyaloshinskii-Moriya interaction Cortés-Ortuño, David; Beg, Marijan; Nehruji, Vanessa arXiv https://doi.org/10.48550/arxiv.1803.11174	text	January 2018
Size and shape of skyrmions for variable Dzyaloshinskii-Moriya interaction and uniaxial anisotropy Behera, Aroop Kumar; Mishra, Swapna Sindhu; Mallick, Sougata arXiv https://doi.org/10.48550/arxiv.1804.10548	text	January 2018
First-principles investigation of chiral magnetic properties in multilayers: Rh/Co/Pt and Pd/Co/Pt Jia, Hongying; Zimmermann, Bernd; Blügel, Stefan arXiv https://doi.org/10.48550/arxiv.1807.07739	text	January 2018
Metastable magnetic bubble in [Co/Pd]4/Py multilayers Wei, Yurui; Song, Chengkun; Ma, Yunxu arXiv https://doi.org/10.48550/arxiv.1808.09215	text	January 2018
Spin torque nano-oscillators based on antiferromagnetic skyrmions Shen, Laichuan; Xia, Jing; Zhao, Guoping arXiv https://doi.org/10.48550/arxiv.1811.02869	text	January 2018
Quantitative imaging of hybrid chiral spin textures in magnetic multilayer systems by Lorentz microscopy Fallon, K.; McVitie, S.; Legrand, W. arXiv https://doi.org/10.48550/arxiv.1901.03652	text	January 2019
Stabilizing spin spirals and isolated skyrmions at low magnetic field exploiting vanishing magnetic anisotropy Hervé, Marie; Dupé, Bertrand; Lopes, Rafael Karlsruhe https://doi.org/10.5445/ir/1000081400	text	January 2018

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