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

Abstract

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.

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [2]; ORCiD logo [5]
  1. National Univ. of Singapore (Singapore); Univ. of Memphis, TN (United States)
  2. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Korea Inst. of Science and Technology, Seoul (South Korea)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. National Univ. of Singapore (Singapore)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Council of Science & Technology (NST); National Research Foundation of Korea (NRF)
OSTI Identifier:
1737423
Report Number(s):
BNL-220710-2020-JAAM
Journal ID: ISSN 0031-9007
Grant/Contract Number:  
SC0012704; AC02-98CH10886; CAP-16-01-KIST; 2019M3F3A1A02071509; 2020R1C1C1012664
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 125; Journal Issue: 22; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Domain walls; spin texture; magnetic multilayers; Lorentz microscopy

Citation Formats

Pollard, Shawn D., Garlow, Joseph A., Kim, Kyoung-Whan, Cheng, Shaobo, Cai, Kaiming, Zhu, Yimei, and Yang, Hyunsoo. Bloch Chirality Induced by an Interlayer Dzyaloshinskii-Moriya Interaction in Ferromagnetic Multilayers. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevlett.125.227203.
Pollard, Shawn D., Garlow, Joseph A., Kim, Kyoung-Whan, Cheng, Shaobo, Cai, Kaiming, Zhu, Yimei, & Yang, Hyunsoo. Bloch Chirality Induced by an Interlayer Dzyaloshinskii-Moriya Interaction in Ferromagnetic Multilayers. United States. https://doi.org/10.1103/physrevlett.125.227203
Pollard, Shawn D., Garlow, Joseph A., Kim, Kyoung-Whan, Cheng, Shaobo, Cai, Kaiming, Zhu, Yimei, and Yang, Hyunsoo. Mon . "Bloch Chirality Induced by an Interlayer Dzyaloshinskii-Moriya Interaction in Ferromagnetic Multilayers". United States. https://doi.org/10.1103/physrevlett.125.227203. https://www.osti.gov/servlets/purl/1737423.
@article{osti_1737423,
title = {Bloch Chirality Induced by an Interlayer Dzyaloshinskii-Moriya Interaction in Ferromagnetic Multilayers},
author = {Pollard, Shawn D. and Garlow, Joseph A. and Kim, Kyoung-Whan and Cheng, Shaobo and Cai, Kaiming and Zhu, Yimei and Yang, Hyunsoo},
abstractNote = {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.},
doi = {10.1103/physrevlett.125.227203},
journal = {Physical Review Letters},
number = 22,
volume = 125,
place = {United States},
year = {2020},
month = {11}
}

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