Time- and vector-resolved magneto-optical Kerr effect measurements of large angle precessional reorientation in a 2×2 μ m2 ferromagnet

P. S. Keatley, V. V. Kruglyak, A. Neudert, M. Delchini, R. J. Hicken, J. R. Childress, J. A. Katine

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Abstract

The precessional dynamics of a 2×2 μ m2 CoFeNiFe (4.6 nm) element stimulated by an in-plane pulsed magnetic field have been investigated using time- and vector-resolved Kerr microscopy measurements and micromagnetic simulations. The time-resolved signals were normalized to in-plane hysteresis loops obtained from the patterned material, and suggest that the magnetization reorients through an angle of 100°±10°. The simulations reveal that only the magnetization of the center region undergoes large angle reorientation, while the canted magnetization at the edges of the element remains pinned. An enhanced Gilbert damping parameter of 0.1 was required to reproduce the experimentally observed Kerr signals.

Original languageEnglish
Article number07D308
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
StatePublished - 2009
Externally publishedYes

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