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Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

Technical Report ·
DOI:https://doi.org/10.2172/1969372· OSTI ID:1969372
 [1];  [2];  [3];  [4];  [5];  [4];  [4];  [5];  [5];  [6];  [7];  [7];  [7];  [7];  [8];  [8];  [7];  [6];  [6];  [6] more »;  [6];  [6];  [7];  [7];  [9];  [8] « less
  1. Univ. of Colorado, Boulder, CO (United States); National Institute of Standards and Technology
  2. Univ. of Colorado, Boulder, CO (United States); Univ. of Colorado, Colorado Springs, CO (United States)
  3. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); European XFEL, Schenefeld (Germany)
  4. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  5. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  6. Univ. of Colorado, Boulder, CO (United States)
  7. Univ. of California San Diego, La Jolla, CA (United States)
  8. National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  9. Uppsala Univ. (Sweden)
+ Show Author Affiliations

Ultrafast optical pumping of systems with spatially nonuniform magnetic textures is known to cause far-from-equilibrium spin transport effects, such as the broadening of domain-walls. Here, we study the dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni multilayers subject to a femtosecond optical pump and find an ultrafast domain dilation by 6% within 1.6 ps. This surprising result is based on the unambiguous determination of a harmonically-related shift of ultrafast magnetic X-ray diffraction for the first- and third-order rings. Domain dilation is plausible from conservation of momentum arguments, whereby inelastic scattering from a hot, quasi-ballistic, radial current transfers momentum to the magnetic domains. Our results suggest a potentially rich variety of unexpected physical phenomena associated with far-from-equilibrium inelastic electron-magnon scattering processes in the presence of spin textures.

Research Organization:
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
SC0006991
OSTI ID:
1969372
Report Number(s):
0001-3141; DE-SC0017643; DE-SC0018237; DE-SC0002002
Country of Publication:
United States
Language:
English

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Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer
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