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Publication Citation: Nonlinear magnetooptic measurement of flux propagation dynamics in thin Permalloy films

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Author(s): Thomas J. Silva; Matthew R. Pufall; Pavel Kabos;
Title: Nonlinear magnetooptic measurement of flux propagation dynamics in thin Permalloy films
Published: March 12, 2003
Abstract: 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]
Citation: Journal of Applied Physics
Volume: 91
Issue: 3
Pages: pp. 1066 - 1073
Keywords: coplanar waveguide;Damon-Eshbach modes;group velocity;magnetic flux pulses;magnetic thin films;magnetostatic surface waves;Permalloy;phase velocity;second-harmonic magnetooptic Kerr effect;
Research Areas: Electromagnetics
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