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Magnetooptical Kerr effect measurements of ultrafast spin dynamics in cobalt nanodots

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6 Author(s)
Wang, D. ; Dept. of Electr., Univ. of Rochester, NY, USA ; Verevkin, A. ; Sobolewski, R. ; Adam, R.
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We present our magnetooptical Kerr effect (MOKE) studies on picosecond spin dynamics in closely spaced rectangular Co dots with sizes ranging from 2×6 μm2 down to 100 × 300 nm2 under in-plane, picosecond, magnetic pulse excitation. A low-temperature-grown GaAs photoconductive switch, excited by femtosecond laser pulses, was used to produce ∼25-ps-long magnetic transients along the surface of the coplanar-waveguide centerline, which contained arrays of patterned Co dots. The resulting spin dynamics in the dots was detected by a time-synchronized train of femtosecond optical probe pulses employing the time-resolved MOKE. Our experimental technique allowed us to measure the initial picosecond dynamics of spins in Co nanodots, followed by damped oscillations. We ascribe the observed results to the small-angle coherent spin precession and show that it depends on the size of magnetic dots.

Published in:

Nanotechnology, IEEE Transactions on  (Volume:4 ,  Issue: 4 )

Date of Publication:

July 2005

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