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Ultrashort pulse laser techniques are applied to study optically induced modulation in exchange biased ferromagnetic/antiferromagnetic (FM/AF) thin bilayer films (NiFe/NiO). Photoexcitation of the FM/AF interface with subpicosecond laser pulses induces large modulation in the unidirectional exchange bias field ( Hₑₓ) on an ultrashort time scale. The ``unpinning'' of the exchange bias leads to coherent magnetization rotation in the permalloy film which is time resolved by the experiment and corresponds to a large modulation in the magnetization component ( ΔMZ/MS~0.5), on a time scale of 100 psec.
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Ju et al. (1999) studied this question.
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