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

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8 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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    He, S., Liu, Y., Zheng, Y., Qin, Q., Wen, Z., Wu, Q., Yang, Y., Wang, Y., Feng, Y., Teo, K. L., & Panagopoulos, C. (2017). Tunable magnetization relaxation of Fe2Cr1-xCoxSi half-metallic Heusler alloys by band structure engineering. Physical Review Materials, 1(6), [064401]. https://doi.org/10.1103/PhysRevMaterials.1.064401