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Sökning: WFRF:(Madhavi Meera)

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1.
  • Jangid, Rahul, et al. (författare)
  • Extreme Domain Wall Speeds under Ultrafast Optical Excitation
  • 2023
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 131:25
  • Tidskriftsartikel (refereegranskat)abstract
    • Time-resolved ultrafast EUV magnetic scattering was used to test a recent prediction of > 10 km/s domain wall speeds by optically exciting a magnetic sample with a nanoscale labyrinthine domain pattern. Ultrafast distortion of the diffraction pattern was observed at markedly different timescales compared to the magnetization quenching. The diffraction pattern distortion shows a threshold dependence with laser fluence, not seen for magnetization quenching, consistent with a picture of domain wall motion with pinning sites. Supported by simulations, we show that a speed of approximate to 66 km/s for highly curved domain walls can explain the experimental data. While our data agree with the prediction of extreme, nonequilibrium wall speeds locally, it differs from the details of the theory, suggesting that additional mechanisms are required to fully understand these effects.
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2.
  • Zhou Hagström, Nanna, 1993-, et al. (författare)
  • Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains
  • 2022
  • Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 106:22
  • Tidskriftsartikel (refereegranskat)abstract
    • Femtosecond optical pumping of magnetic materials has been used to achieve ultrafast switching and recently to nucleate symmetry-broken magnetic states. However, when the magnetic order parameter already presents a broken-symmetry state, such as a domain pattern, the dynamics are poorly understood and consensus remains elusive. Here, we resolve the controversies in the literature by studying the ultrafast response of magnetic domain patterns with varying degrees of translation symmetry with ultrafast x-ray resonant scattering. A data analysis technique is introduced to disentangle the isotropic and anisotropic components of the x-ray scattering. We find that the scattered intensity exhibits a radial shift restricted to the isotropic component, indicating that the far-from-equilibrium magnetization dynamics are intrinsically related to the spatial features of the domain pattern. Our results suggest alternative pathways for the spatiotemporal manipulation of magnetism via far-from-equilibrium dynamics and by carefully tuning the ground-state magnetic textures.
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