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Generation and stability of structurally imprinted target skyrmions in magnetic multilayers

Author(s)
Kent, NoahStreubel, RobertLambert, Charles-HenriCeballos, AlejandroJe, Soong-GunDhuey, ScottIm, Mi-YoungButtner, FelixHellman, FrancesSalahuddin, SayeefFischer, Peter
Issued Date
2019-09
DOI
10.1063/1.5099991
URI
https://scholarworks.unist.ac.kr/handle/201301/27843
Fulltext
https://aip.scitation.org/doi/10.1063/1.5099991
Citation
APPLIED PHYSICS LETTERS, v.115, no.11, pp.112404
Abstract
Target Skyrmions (TSks) are extended topological spin textures with a constant chirality where the rotation of the z component of the magnetization is larger than pi. TSks have topological charge 1 or 0, if the z component of the magnetization M-z goes through a rotation of n pi where n is an odd or even integer, respectively. TSks with a rotation of the z component of up to 4 pi have been imaged via high spatial resolution element-specific x-ray imaging. The TSks were generated by weakly coupling 30 nm thin Permalloy (Ni80Fe20, PY) disks with a 1 mu m diameter to asymmetric (Ir 1 nm/Co 1.5 nm/Pt 1 nm) x 7 multilayers that exhibit Dzyaloshinskii-Moriya interaction. The PY disks stabilize the TSks in the multilayers due to reduced stray field energy and enforced circular symmetry from pinning of domain walls at the edges of the disks. Upon applying external magnetic fields, it is the skyrmion core at the center that ensures stability of the TSk, whereas the collapse of the extended structures in the TSk does not depend on the topological charge.
Publisher
AMER INST PHYSICS
ISSN
0003-6951

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