期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.217203
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资金
- German Bundesministerium fur Bildung und Forschung [05K10KTB/FSP-301]
- FERMI project of Elettra-Sincrotrone Trieste
- Ministry of University and Research [FIRB-RBAP045JF2, FIRB-RBAP06AWK3]
- DFG [SFB 925]
- CNRS through the PEPS SASELEX
- French ANR via the FEMTO-X-MAG project
- LabEx PALM through the RAMSES project
Ultrashort, coherent x-ray pulses of a free-electron laser are used to holographically image the magnetization dynamics within a magnetic domain pattern after creation of a localized excitation via an optical standing wave. We observe a spatially confined reduction of the magnetization within a couple of hundred femtoseconds followed by its slower recovery. Additionally, the experimental results show evidence of a spatial evolution of magnetization, which we attribute to ultrafast transport of nonequilibrium spin-polarized electrons for early times and to a fluence-dependent remagnetization rate for later times.
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