Tunable magnetization relaxation of Fe2Cr1-xCoxSi half-metallic Heusler alloys by band structure engineering

Shikun He, Yifan Liu, Yuhong Zheng, Qing Qin, Zhenchao Wen, Qingyun Wu, Yi Yang, Yupu Wang, Yuanping Feng, Kie Leong Teo, Christos Panagopoulos

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    We report a systematic investigation on the magnetization relaxation properties of iron-based half-metallic Heusler alloy Fe2Cr1-xCoxSi (FCCS) thin films using broadband angular-resolved ferromagnetic resonance. Band structure engineering through Co doping (x) demonstrated by first-principles calculations is shown to tune the intrinsic magnetic damping over an order of magnitude, namely 1×10-2-8×10-4. Notably, the intrinsic damping constants for samples with high Co concentration are among the lowest reported for Heusler alloys and even comparable to magnetic insulator yttrium iron garnet. Furthermore, a significant reduction of both isotropic and anisotropic contributions of extrinsic damping of the FCCS alloys was found in the FCCS films with x=0.5-0.75, which is of particular importance for applications. These results demonstrate a practical recipe to tailor functional magnetization for Heusler alloy-based spintronics at room temperature.

    Original languageEnglish
    Article number064401
    JournalPhysical Review Materials
    Volume1
    Issue number6
    DOIs
    Publication statusPublished - 2017 Nov 1

    ASJC Scopus subject areas

    • Materials Science(all)
    • Physics and Astronomy (miscellaneous)

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