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Nonlinear magnetooptic measurement of flux propagation dynamics in thin Permalloy films



Thomas J. Silva, Matthew R. Pufall, Pavel Kabos


Time-resolved nonlinear optics are used to study the propagation of magnetic flux pulses in a 250 nm Permalloy film. The flux is generated in the film by coupling it to a coplanar waveguide structure driven with broadband voltage pulses. Flux pulses propagated in the film with a phase velocity of 4.2 × 10 5 m/s and a group velocity of 1.5 × 105 n/s. Both velocities are consistent with the predictions of Damon-Eshbach theory for magnetostatic surface waves with 200-300 υm wavelengths. Within 100 υm of the excitation source, flux pulses decayed monotonically but with no measurable delay. © 2002 American Institute of Physics. [DOI:10.1063/1.1421040]
Journal of Applied Physics


coplanar waveguide, Damon-Eshbach modes, group velocity, magnetic flux pulses, magnetic thin films, magnetostatic surface waves, Permalloy, phase velocity, second-harmonic magnetooptic Kerr effect
Created March 12, 2003, Updated February 19, 2017