Imaging the spin chirality of ferrimagnetic Néel skyrmions stabilized on topological antiferromagnetic Mn3Sn

Xu, Teng; Chen, Zhen; Zhou, Heng-An; Wang, Zidong; Dong, Yiqing; Aballe, Lucia; Foerster, Michael; Gargiani, Pierluigi; Valvidares, Manuel; Bracher, David M.; Savchenko, Tatiana; Kleibert, Armin; Tomasello, Riccardo; Finocchio, Giovanni; Je, Soong-Guen; Im, Mi-Young; Muller, David A.; Jiang, Wanjun

doi:10.1103/physrevmaterials.5.084406

Title: Imaging the spin chirality of ferrimagnetic Néel skyrmions stabilized on topological antiferromagnetic Mn₃Sn

Journal Article · 13 August 2021 · Physical Review Materials

DOI: https://doi.org/10.1103/physrevmaterials.5.084406 · OSTI ID:1821152

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^[1]; Dong, Yiqing ^[1]; Aballe, Lucia ^[3]; Foerster, Michael ^[3]; Gargiani, Pierluigi ^[3]; Valvidares, Manuel ^[3]; Bracher, David M. ^[4];

^[4];

^[4]; Tomasello, Riccardo ^[5]; Finocchio, Giovanni ^[6]; Je, Soong-Guen ^[7]; Im, Mi-Young ^[7]; Muller, David A. ^[2];

^[1]

Tsinghua Univ., Beijing (China)
Cornell Univ., Ithaca, NY (United States)
ALBA Synchrotron Light Source, Barcelona (Spain)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Foundation for Research and Technology - Hellas (FORTH), Crete (Greece)
Univ. of Messina (Italy)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Néel skyrmions are generally realized in asymmetric multilayers made of heavy metals (HMs) and ultrathin ferromagnets possessing strong interfacial Dzyaloshinskii-Moriya interactions (iDMIs). Depending on the relative strengths of iDMIs at the interfaces, various types of Néel skyrmions have been suggested, which are typified with characteristically different topological properties and current-driven dynamics. This suggests the importance of a precise quantification of their spin chiralities. In this paper, we explore the possibility of realizing Néel skyrmions in magnetic multilayers without the direct usage of standard HMs. Specifically, through depositing a thin layer of ferrimagnetic (FIM) CoTb layer on top of an antiferromagnetic (AFM) quantum material of composition Mn₃Sn, the AFM exchange interaction at the asymmetric interface provides an equivalent iDMI for stabilizing FIM Néel skyrmions. Secondly, through using advanced four-dimensional Lorentz scanning transmission electron microscopy (4D LSTEM), in combination with x-ray magnetic circular dichroism photoemission electron microscopy (XMCD-PEEM), we can directly determine the spin chirality of FIM Néel skyrmions. Finally, the present findings not only broaden the phase space for chiral interfacial magnetism but also provide a possibility for future applications of heavy-metal-free skyrmionic devices.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Beijing Natural Science Foundation; Defense Advanced Research Projects Agency (DARPA); General Secretariat for Research and Technology (GSRT); Hellenic Foundation for Research and Innovation (HFRI); Korea government; National Key R&D Program of China; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); Swiss Nanoscience Institute; Swiss National Science Foundation; USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1821152

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 8 Vol. 5; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Imaging the spin chirality of ferrimagnetic Néel skyrmions stabilized on topological antiferromagnetic Mn3Sn

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Title: Imaging the spin chirality of ferrimagnetic Néel skyrmions stabilized on topological antiferromagnetic Mn₃Sn