Quantifying chiral exchange interaction for Néel-type skyrmions via Lorentz transmission electron microscopy

Jiang, Wanjun; Zhang, Sheng; Wang, Xiao; Phatak, Charudatta; Wang, Qiang; Zhang, Wei; Jungfleisch, Matthias Benjamin; Pearson, John E.; Liu, Yizhou; Zang, Jiadong; Cheng, Xuemei; Petford-Long, Amanda; Hoffmann, Axel; te Velthuis, Suzanne G. E.

doi:10.1103/PhysRevB.99.104402

Title: Quantifying chiral exchange interaction for Néel-type skyrmions via Lorentz transmission electron microscopy

Journal Article · Mon Mar 04 00:00:00 EST 2019 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.99.104402· OSTI ID:1503253

Jiang, Wanjun ^[1]; Zhang, Sheng ^[2]; Wang, Xiao ^[3]; Phatak, Charudatta ^[4]; Wang, Qiang ^[5]; Zhang, Wei ^[6]; Jungfleisch, Matthias Benjamin ^[7]; Pearson, John E. ^[4]; Liu, Yizhou ^[8]; Zang, Jiadong ^[9]; Cheng, Xuemei ^[10]; Petford-Long, Amanda ^[4]; Hoffmann, Axel ^[4]; te Velthuis, Suzanne G. E. ^[4]

Tsinghua Univ., Beijing (China); Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); City Univ. (CUNY), NY (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Bryn Mawr College, PA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); West Virginia Univ., Morgantown, WV (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Oakland Univ., Rochester, MI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Delaware, Newark, DE (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of New Hampshire, Durham, NH (United States)
Bryn Mawr College, PA (United States)

Magnetic skyrmions are topological spin textures that have been observed in bulk magnets and magnetic multilayers. For bulk magnetic materials, their noncollinear spin profiles have often been studied by using Lorentz transmission electron microscopy (TEM). We experimentally utilized Lorentz TEM imaging to study an inversion asymmetric [Pt(1.5nm)/Co(1 nm)/W(1 nm)]₈ heterostructure that exhibits Neel-type skyrmions at zero field. By tracking the evolution of skyrmion diameters as a function of magnetic fields, we determined the strength of the interfacial Dzyaloshinskii-Moriya interaction (DMI). Our results suggest that in situ Lorentz TEM imaging combined with simulations can provide valuable quantitative information about the interfacial DMI strengths, which can be helpful for optimizing skyrmion materials. Furthermore, we show that in theory, Lorentz TEM can identify the spin chirality of Neel-type skyrmions, although an experimental verification is challenging due to the relatively low signal-to-noise ratio.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Key Research and Development Program of China; National Science Foundation of China; National Science Foundation (NSF); USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; SC0016424

OSTI ID:: 1503253

Alternate ID(s):: OSTI ID: 1497748

Journal Information:: Physical Review, B: Condensed Matter, Vol. 99, Issue 10; ISSN 0163-1829

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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