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Title: Observation of stable Néel skyrmions in cobalt/palladium multilayers with Lorentz transmission electron microscopy
Authors: Pollard, S.D 
Garlow, J.A
Yu, J 
Wang, Z
Zhu, Y
Yang, H 
Keywords: cobalt derivative
heavy metal
ion exchange
observational method
transmission electron microscopy
chemical structure
magnetic field
room temperature
transmission electron microscopy
Issue Date: 2017
Publisher: Nature Publishing Group
Citation: Pollard, S.D, Garlow, J.A, Yu, J, Wang, Z, Zhu, Y, Yang, H (2017). Observation of stable Néel skyrmions in cobalt/palladium multilayers with Lorentz transmission electron microscopy. Nature Communications 8 : 14761. ScholarBank@NUS Repository.
Abstract: 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 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. © The Author(s) 2017.
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/ncomms14761
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