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    Chiral damping of magnetic domain walls

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    Type
    Article
    Authors
    Jué, Emilie cc
    Safeer, C. K.
    Drouard, Marc
    Lopez, Alexandre
    Balint, Paul
    Buda-Prejbeanu, Liliana
    Boulle, Olivier
    Auffret, Stephane
    Schuhl, Alain
    Manchon, Aurelien cc
    Miron, Ioan Mihai
    Gaudin, Gilles
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2015-12-21
    Online Publication Date
    2015-12-21
    Print Publication Date
    2016-03
    Permanent link to this record
    http://hdl.handle.net/10754/596855
    
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    Abstract
    Structural symmetry breaking in magnetic materials is responsible for the existence of multiferroics1, current-induced spin–orbit torques2, 3, 4, 5, 6, 7 and some topological magnetic structures8, 9, 10, 11, 12. In this Letter we report that the structural inversion asymmetry (SIA) gives rise to a chiral damping mechanism, which is evidenced by measuring the field-driven domain-wall (DW) motion in perpendicularly magnetized asymmetric Pt/Co/Pt trilayers. The DW dynamics associated with the chiral damping and those with Dzyaloshinskii–Moriya interaction (DMI) exhibit identical spatial symmetry13, 14, 15, 16, 17, 18, 19. However, both scenarios are differentiated by their time reversal properties: whereas DMI is a conservative effect that can be modelled by an effective field, the chiral damping is purely dissipative and has no influence on the equilibrium magnetic texture. When the DW motion is modulated by an in-plane magnetic field, it reveals the structure of the internal fields experienced by the DWs, allowing one to distinguish the physical mechanism. The chiral damping enriches the spectrum of physical phenomena engendered by the SIA, and is essential for conceiving DW and skyrmion devices owing to its coexistence with DMI (ref. 20).
    Citation
    Chiral damping of magnetic domain walls 2015 Nature Materials
    Publisher
    Springer Nature
    Journal
    Nature Materials
    DOI
    10.1038/nmat4518
    PubMed ID
    26689141
    arXiv
    1504.04411
    Additional Links
    http://www.nature.com/doifinder/10.1038/nmat4518
    ae974a485f413a2113503eed53cd6c53
    10.1038/nmat4518
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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