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    Emergence of Room Temperature Magnetotransport Anomaly in Epitaxial Pt/γ′-Fe4N/MgO Heterostructures toward Noncollinear Spintronics

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    Type
    Article
    Authors
    Shi, Xiaohui
    Jiang, Jiawei
    Wang, Yadong
    Hou, Zhipeng cc
    Zhang, Qiang cc
    Mi, Wenbo cc
    Zhang, Xixiang cc
    KAUST Department
    Imaging and Characterization Core Lab
    Nanofabrication Core Lab
    Thin Films & Characterization
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering Program
    Date
    2021-05-27
    Online Publication Date
    2021-05-27
    Print Publication Date
    2021-06-09
    Embargo End Date
    2022-05-27
    Submitted Date
    2021-04-17
    Permanent link to this record
    http://hdl.handle.net/10754/669296
    
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    Abstract
    Noncollinear spin textures have attracted much attention due to their novel physical behaviors in heavy/ferromagnetic metal (HM/FM) systems. The transport anomaly, appearing as contrast humps in Hall resistivity curves, is the mark of noncollinear spin textures. Here, the epitaxial Pt/γ'-Fe<sub>4</sub>N bilayers with noncollinear spin textures were obtained by facing target sputtering. Large micromagnetic Dzyaloshinskii-Moriya interaction coefficient <i>D</i> of 2.90 mJ/m<sup>2</sup> appears in Pt/γ'-Fe<sub>4</sub>N/MgO systems, which is larger than 2.05 mJ/m<sup>2</sup> of Pt/Co/MgO systems with skyrmionic states. Moreover, at 300 K, magnetic bubble-like domains appear in Pt/γ'-Fe<sub>4</sub>N bilayers that just possess a 3 nm thick ferromagnetic layer instead of [HM/FM]<i><sub>n</sub></i> or [HM<sub>1</sub>/FM/HM<sub>2</sub>]<i><sub>n</sub></i> multilayers. Additionally, a room-temperature transport anomaly appears in Pt/γ'-Fe<sub>4</sub>N/MgO systems. The contrast humps of Pt(3 nm)/γ'-Fe<sub>4</sub>N(<i>t</i><sub>Fe<sub>4</sub>N</sub> ≤ 4 nm)/MgO heterostructures are not sharp due to the nonuniform distributions of the magnetic bubble-like domains with various sizes and irregular shapes, as observed by the magnetic force microscopy. The discovery of epitaxial Pt/γ'-Fe<sub>4</sub>N bilayers with noncollinear spin states is more crucial than that of polycrystalline or amorphous HM/FM systems for reducing ohmic heating, which provides a candidate for noncollinear spintronic applications.
    Citation
    Shi, X., Jiang, J., Wang, Y., Hou, Z., Zhang, Q., Mi, W., & Zhang, X. (2021). Emergence of Room Temperature Magnetotransport Anomaly in Epitaxial Pt/γ′-Fe4N/MgO Heterostructures toward Noncollinear Spintronics. ACS Applied Materials & Interfaces. doi:10.1021/acsami.1c07098
    Sponsors
    This work is supported by the National Natural Science Foundation of China (nos. 51871161 and 52071233).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Materials & Interfaces
    DOI
    10.1021/acsami.1c07098
    PubMed ID
    34042440
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsami.1c07098
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsami.1c07098
    Scopus Count
    Collections
    Nanofabrication Core Lab; Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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