Research ArticleAPPLIED PHYSICS

Electric-field control of spin dynamics during magnetic phase transitions

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Science Advances  02 Oct 2020:
Vol. 6, no. 40, eabd2613
DOI: 10.1126/sciadv.abd2613
  • Fig. 1 Tuning mechanism of the magnetic damping in FeRh/PMN-PT.

    (A) Schematic illustration of the FeRh/PMN-PT heterostructure where the antiferromagnetic (AFM) domains embedded in the ferromagnetic (FM) matrix of FeRh were driven into FMR by microwave magnetic fields hrf. The electric field (E) was applied across the thickness direction of the PMN-PT substrate to induce piezo strains. Bottom schematics show the isothermal growth of antiferromagnetic domains in the FeRh under relatively large electric fields. The curves in the blue region represents the profile of spin current density across the lateral direction of the antiferromagnetic domain, where |Js0| is the magnitude of spin current density at the ferromagnetic/antiferromagnetic interface; λ is the spin diffusion length in the antiferromagnetic domain. a.u., arbitrary units. (B) FMR spectra and the fittings of the FeRh/PMN-PT at 380 K during heating with applied electric fields of 0 (red) and 0.67 V μm−1 (blue), respectively. (C) Temperature dependence of the resonance linewidth μ0ΔH and the corresponding effective magnetic damping αeff with applied electric fields of 0 (red) and 0.67 V μm−1 (blue), respectively. (D) Temperature dependence of the ferromagnetic phase fraction with applied electric fields of 0 (red) and 0.67 V μm−1 (blue), respectively.

  • Fig. 2 Modulation of the damping during the magnetic phase transition.

    (A and B) Change of the effective magnetic damping (A) and the ferromagnetic phase fraction induced by the applied electric field of 0.67 V μm−1 as a function of the temperature. The solid curve in (A) represents the analytical model fitting.

  • Fig. 3 Reversible modulation of the damping.

    Effective magnetic damping (A) and the ferromagnetic phase fraction (B) as a function of applied electric fields at 380 K during heating. The solid curve in (A) represents the analytical model fitting.

Supplementary Materials

  • Supplementary Materials

    Electric-field control of spin dynamics during magnetic phase transitions

    Tianxiang Nan, Yeonbae Lee, Shihao Zhuang, Zhongqiang Hu, James D. Clarkson, Xinjun Wang, Changhyun Ko, HwanSung Choe, Zuhuang Chen, David Budil, Junqiao Wu, Sayeef Salahuddin, Jiamian Hu, Ramamoorthy Ramesh, Nian Sun

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