Ultrafast dynamics of exchange stiffness in Co/Pt multilayer
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Abstract
Abstract The exchange stiffness coefficient, A ex , represents the strength of direct exchange interactions among neighboring spins. A ex is linked to most of the magnetic properties such as skyrmion formation, magnetic vortex, magnetic domain wall width, and exchange length. Hence, the quantification of A ex is essential to understanding fundamental magnetic properties, but little is known for the dynamics of A ex on a sub-picosecond timescale. We report the ultrafast dynamcis of A ex in an ordered magnetic state in Co/Pt ferromagnetic multilayer. Time-resolved magneto-optical Kerr effect and reflectivity measurements were analyzed for various pump fluences. We reveal that the significant dynamical reduction of A ex is responsible for the dramatic increase of remagnetization time for high fluences. The analysis shows that A ex dynamically varies, strongly affecting overall ultrafast demagnetization/remagnetization process. The investigation demonstrates the possibility of A ex engineering in femtosecond timescale and thereby provides a way to design ultrafast spintronic devices.
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