Bloch Chirality Induced by an Interlayer Dzyaloshinskii-Moriya Interaction in Ferromagnetic Multilayers

Pollard, Shawn D.; Garlow, Joseph A.; Kim, Kyoung-Whan; Cheng, Shaobo; Cai, Kaiming; Zhu, Yimei; Yang, Hyunsoo

doi:10.1103/physrevlett.125.227203

Title: Bloch Chirality Induced by an Interlayer Dzyaloshinskii-Moriya Interaction in Ferromagnetic Multilayers

Journal Article · Mon Nov 23 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.227203· OSTI ID:1737423

Pollard, Shawn D. ^[1]; Garlow, Joseph A. ^[2];

^[3];

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National Univ. of Singapore (Singapore); Univ. of Memphis, TN (United States)
Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Korea Inst. of Science and Technology, Seoul (South Korea)
Brookhaven National Lab. (BNL), Upton, NY (United States)
National Univ. of Singapore (Singapore)

Chiral spin textures stabilized by the interfacial Dzyaloshinkii-Moriya interaction, such as skyrmions and homochiral domain walls, have been shown to exhibit qualities that make them attractive for their incorporation in a variety of spintronic devices. However, for thicker multilayer films, mixed textures occur in which an achiral Bloch component coexists with a chiral Néel component of the domain wall to reduce the demagnetization field at the film surface. We show that an interlayer Dzyaloshinkii-Moriya interaction can break the degeneracy between Bloch chiralities. We further find large population asymmetries and chiral branching in the Bloch component of the domain walls in well-ordered Co/Pd multilayers. This asymmetry is a result of the combined effect of the demagnetization field and an interlayer Dzyaloshinkii-Moriya interaction, and is strongly related to film thickness and structural ordering. This work paves the way toward the utilization of this effect toward controlling Bloch chirality in magnetic multilayers.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Council of Science & Technology (NST); National Research Foundation of Korea (NRF)

Grant/Contract Number:: SC0012704; AC02-98CH10886; CAP-16-01-KIST; 2019M3F3A1A02071509; 2020R1C1C1012664

OSTI ID:: 1737423

Report Number(s):: BNL-220710-2020-JAAM; TRN: US2205310

Journal Information:: Physical Review Letters, Vol. 125, Issue 22; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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