Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2006-05-10
Physics
Condensed Matter
Other Condensed Matter
12 pages, 3 figures; accepted by Physical Review Letters
Scientific paper
10.1103/PhysRevLett.97.177201
The femtosecond magnetization dynamics of a thin cobalt film excited with ultrashort laser pulses has been studied using two complementary pump-probe techniques, namely spin-, energy- and time-resolved photoemission and time-resolved magneto-optical Kerr effect. Combining the two methods it is possible to identify the microscopic electron spin-flip mechanisms responsible for the ultrafast macroscopic magnetization dynamics of the cobalt film. In particular, we show that electron-magnon excitation does not affect the overall magnetization even though it is an efficient spin-flip channel on the sub-200 fs timescale. Instead we find experimental evidence for the relevance of Elliott-Yafet type spin-flip processes for the ultrafast demagnetization taking place on a time scale of 300 fs.
Aeschlimann Martin
Albaneda Sánchez M.
Andreyev O.
Bauer Marianne
Cinchetti Mirko
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